CN106771082A

CN106771082A - Content of unfrozen water in frozen earth detecting system and method based on soil body change in resistance

Info

Publication number: CN106771082A
Application number: CN201710031330.0A
Authority: CN
Inventors: 唐丽云; 王柯; 杨更社; 奚家米; 王杰; 邱培勇; 王伯超; 王晓刚; 徐屹凡
Original assignee: Xian University of Science and Technology
Current assignee: Xian University of Science and Technology
Priority date: 2017-01-17
Filing date: 2017-01-17
Publication date: 2017-05-31
Anticipated expiration: 2037-01-17
Also published as: CN106771082B

Abstract

The invention discloses a kind of content of unfrozen water in frozen earth detecting system based on soil body change in resistance, its system includes terrestrial data transmission terminal, computer and temperature and resistivity detecting device for inserting in the soil body, temperature and resistivity detecting device include the detection unit of a detection unit or multiple mounted on top, detection unit includes sleeve pipe and data collecting circuit board, and data acquisition transmission circuit and power line are integrated with data acquisition circuit plate；Data acquisition transmission circuit includes first microprocessor, the first data storage, the first wireless communication module, temperature measurement probe and resistivity measurement probe；The invention also discloses a kind of content of unfrozen water in frozen earth detection method based on soil body change in resistance.It is of the invention to realize convenient, content of unfrozen water in frozen earth to be detected challenge simplification, and measurement result is accurate, real-time and integrality are good, practical, and using effect is good, are easy to promote the use of.

Description

Content of unfrozen water in frozen earth detecting system and method based on soil body change in resistance

Technical field

The invention belongs to content of unfrozen water in frozen earth detection technique field, and in particular to a kind of based on soil body change in resistance Content of unfrozen water in frozen earth detecting system and method.

Background technology

Do not freeze water in frozen soil and important role is play in frozen soil mechanics, content of unfrozen water in frozen earth is to the soil body and pile foundation Between interaction have significant impact, in the research for frozen soil, the mensuration mode of content of unfrozen water in frozen earth is all the time All no explanation to systematic science, therefore for academic research and engineering practice, this is a problem demanding prompt solution.

The content of unfrozen water in frozen earth method of testing that current this field is used mainly has nuclear magnetic resonance method, neutron spin echo Method, calorimetry, dielectric property method, the conventional method in laboratory also have thermometry, equal Shortcomings of approach described above or not In place of rationally.Specifically, nuclear magnetic resonance method cost is too high, it is impossible to meet experiment and the requirement of Practical Project.Neutron Spin echo method occurs free damping, by decay using the signal source in magnetic resonance after first radio-frequency pulse To judge unfrozen water content, its principle is complicated, and feasibility is not strong.Calorimetry is being put into just with the frozen soil sample for stablizing subzero temperature Making it in warm calorimetric water carries out heat exchange, and specimen temperature reaches balance with calorimetric coolant-temperature gage, its test apparatus complex operation, and needs Certain heat exchanger time is wanted, therefore conveniently can not quickly measure the instantaneous content for not freezing water.Dielectric property method obtains determinand After the ultra-wideband pulse dielectric response curve of matter, its dielectric constant need to be determined by inversion algorithm.Need to pass through in refutation process Accurate multidimensional inverse model is set up in the sampling at enough time points, accurately calculate each composition dielectric constant, resistivity, The parameters such as porosity, water content.In practical operation, due to condition limitation, the consideration of each influence factor is complete not enough, therefore It is perfect not enough using ultra-wideband pulse dielectric response log inversion model, error.The conventional thermometry test in laboratory The data that result is measured only are a certain to freeze the corresponding initial water content of initial temperature, it is impossible to illustrate in frozen soil unfrozen water content with The change procedure of temperature.So from two angles of design principle and Practical science of measuring apparatus, one kind can be comprehensive The test equipment for considering content of unfrozen water in frozen earth Changing Pattern is necessary.

Unfrozen water content change can be considered from the angle of temperature in frozen soil, and temperature drop can cause original water in the soil body Freeze, temperature rises can cause the thawing of original ice in the soil body, both change can all cause the change of unfrozen water content, and this Individual change experiment proves that most direct mode is resistivity, and more than zero degrees celsius, temperature change can cause ice in the soil body Melt moisture evaporation so that free water content reduction, so that soil body change in resistance, below zero degrees celsius, temperature becomes Change can cause soil body Free water to freeze to cause the change of water content so that soil body change in resistance, so if can determine The relation for going out temperature, resistivity and not freezing between water water content, and known using testing temperature and resistivity and do not freeze water water content, To well solve not freeze the technical barrier of water moisture measurement, but, in the prior art, also lack suitable detecting system and Method.

The content of the invention

The technical problems to be solved by the invention are for above-mentioned deficiency of the prior art, there is provided a kind of structure letter Single, realization is convenient, challenge that is can detecting content of unfrozen water in frozen earth is simplified and measurement result is accurate, practical, Using effect is good, be easy to the content of unfrozen water in frozen earth detecting system based on soil body change in resistance promoted the use of.

In order to solve the above technical problems, the technical solution adopted by the present invention is：A kind of jelly based on soil body change in resistance Native unfrozen water content detecting system, it is characterised in that：Including terrestrial data transmission terminal, computer and for inserting in the soil body Temperature and resistivity detecting device, the temperature and resistivity detecting device include a detection unit or multiple mounted on top Detection unit, the detection unit includes sleeve pipe and data collecting circuit board, and described sleeve pipe is by from top to bottom integrally formed the Sleeve, the second sleeve pipe and the 3rd sleeve pipe composition, the external diameter of the external diameter less than the second sleeve pipe of the first sleeve, described second set The external diameter of pipe is equal with the external diameter of the 3rd sleeve pipe, the internal diameter of the internal diameter less than the 3rd sleeve pipe of second sleeve pipe, the first set External screw thread is provided with the outer wall of pipe, internal thread is provided with the inwall of the 3rd sleeve pipe, when the quantity of the detection unit Two detection units neighbouring during for multiple are connected by way of first sleeve is connected with the 3rd casing threads, described Data acquisition circuit plate is arranged on the transition position of the second sleeve pipe and the 3rd sleeve pipe, and data are integrated with the data acquisition circuit plate Gather transmission circuit and for connecting the power line that externally fed power supply is each electricity consumption module for power supply in data acquisition transmission circuit, One end of the power line is drawn out to first sleeve top and connection along the inwall of the second sleeve pipe and the inwall of first sleeve upwards There is the first conducting strip, the other end of the power line is connected with positioned at data acquisition circuit plate bottom and for by the 3rd sleeve pipe The second conducting strip docked with the first conducting strip when being threadedly coupled with first sleeve, the data acquisition transmission circuit includes first Microprocessor and the first data storage and the first wireless communication module that connect with first microprocessor, the data acquisition The many temperature measurement probe installing pipes and Duo Gen stretched out the second sleeve pipe and bend vertically downwards are fixedly connected with circuit board to stretch Go out the resistivity measurement probe installing pipe of the second sleeve pipe and bending vertically downwards, the vertical section of the temperature measurement probe installing pipe Inside be provided with the temperature measurement probe being connected with the input of first microprocessor, the resistivity measurement probe installing pipe it is perpendicular The resistivity measurement probe being connected with the input of first microprocessor is provided with straight section；The terrestrial data transmission terminal bag Include the second microprocessor and connect with the second microprocessor the second data storage, for being connected with computer and communicate Usb communication circuit module and for the first wireless communication module wireless connection and the second wireless communication module for communicating.

The above-mentioned content of unfrozen water in frozen earth detecting system based on soil body change in resistance, it is characterised in that：The temperature The quantity of the quantity of measuring probe installing pipe and resistivity measurement probe installing pipe is four, and four temperature measurement probes are installed Pipe and four resistivity measurement probe installing pipes are uniformly arranged on data acquisition circuit plate, the temperature measurement probe installing pipe With the resistivity measurement probe spaced setting of installing pipe.

The above-mentioned content of unfrozen water in frozen earth detecting system based on soil body change in resistance, it is characterised in that：Described first The transition position of sleeve pipe and the second sleeve pipe is provided with top board, and the power line passes through the top board.

The above-mentioned content of unfrozen water in frozen earth detecting system based on soil body change in resistance, it is characterised in that：Described first Microprocessor is single-chip microcomputer.

The invention also discloses a kind of method and step it is simple, reasonable in design, realize easily be based on soil body change in resistance Content of unfrozen water in frozen earth detection method, it is characterised in that the method is comprised the following steps：

Step one, the number that detection unit is selected according to the height of frozen soil to be measured；

Step 2, when detection unit number be one when, directly detection unit is inserted in the soil body；When detection unit When number is for multiple, multiple detection units are first connected as an entirety, then a multiple detection units for entirety will be connected as Insert in the soil body, and the vertical section of the vertical section of temperature measurement probe installing pipe and resistivity measurement probe installing pipe is adjusted For straight down；Or, first a detection unit is inserted in the soil body, a detection unit on top is reconnected, until by institute Some detection unit connections are placed into the soil body, and the vertical section of temperature measurement probe installing pipe and resistivity measurement probe are pacified The vertical section of tubulature is adjusted to straight down；

Step 3, the first conducting strip is connected with the output end of external power source；

The temperature that first microprocessor in step 4, detection unit is detected to temperature measurement probe periodically adopt Collection, and periodicity collection is carried out to the resistivity that resistivity measurement probe is detected, the temperature data and resistivity that will be collected In the data storages of data Cun Chudao first, and terrestrial data transmission terminal, ground are sent to by the first wireless communication module The second microprocessor in data transmission terminal receives the temperature number that first microprocessor sends by the second wireless communication module According to and resistivity data, store in the second data storage, and computer is sent to by usb communication circuit module；

Step 5, computer are by temperature data and resistivity data input beforehand through being tested and processed experimental data In the frozen soil resistivity and temperature of acquisition and the relational model of content of unfrozen water in frozen earth, content of unfrozen water in frozen earth is obtained.

Above-mentioned method, it is characterised in that：Described in step 5 beforehand through tested and processed experimental data obtain Frozen soil resistivity and temperature are comprised the following steps with the method for the relational model of content of unfrozen water in frozen earth：

Step 501, preparing experiment equipment, the experimental facilities include soil sample box, ac voltage regulator, ammeter, voltage Table, vacuum drying chamber, electronic balance, household freezer and temperature measuring set, temperature measurement probe is connected with the temperature measuring set, Being provided with the left and right sides side wall of the soil sample box can be with the conducting strip of the end in contact of soil sample two in soil sample box, the soil The temperature measurement probe hole for temperature measurement probe insertion is provided with the antetheca and/or rear wall of sample box；

Step 502, drying condition experiment is carried out, measure the relation of positive temperature section soil sample resistivity and instantaneous moisture content, specifically Process is：

Step 5021, connection experimental facilities：The positive pole of ammeter is connected with the cathode output end of ac voltage regulator, Conducting strip is connected by wire on the negative pole of ammeter, connects conductive by wire in the cathode output end of ac voltage regulator Piece；And the positive pole of voltmeter is connected with the negative pole with ammeter conducting strip connection, by with the negative pole with ac voltage regulator The conducting strip connection of connection；

Step 5022, electronic balance is put into temperature no more than in 40 DEG C of vacuum drying chamber, and is put on electronic balance Upper soil sample support, is the quality of soil sample support by the read-record of now electronic balance, then respectively by multiple difference initial aqueous The soil sample of rate is placed in soil sample box, after soil sample box is removed after soil sample stabilization shaping, is connected the negative pole with ammeter by rubber band Conducting strip and the conducting strip that is connected with the negative pole of ac voltage regulator be separately fixed at the soil sample left and right sides, then soil sample is put Enter in vacuum drying chamber and be placed on soil sample support；Soil sample is inserted every time, the read-record of electronic balance when all putting into soil sample It is soil sample initial mass, and it is that measuring point record instantaneous mass, voltmeter show often to reduce m mass with electronic balance reading The registration I of number U and ammeter；Further according to formulaIt is calculated Water Content Tests in Soil Samples θ；And according to formulaIt is calculated the corresponding soil sample electricalresistivityρs of Water Content Tests in Soil Samples θ of each record；Wherein, C for dry ground quality andA is soil sample initial mass, and B is the quality of soil sample support, and D is the instantaneous mass of measuring point record, and w is soil sample Initial aqueous rate；L is the length of soil sample box, and S is the area of soil sample box left surface or right flank；

Step 5023, the Water Content Tests in Soil Samples θ that will be calculated in step 5022 and soil sample electricalresistivityρ and the initial of soil sample contain In the EXCEL softwares of the corresponding input computer of water rate, soil sample resistivity and soil sample under positive temperature section difference initial aqueous rate are formed The mapping table of moisture content；

Step 5024, in the EXCEL softwares of computer, with Water Content Tests in Soil Samples as abscissa, soil sample resistivity is vertical seat Mark, to the data of the mapping table of soil sample resistivity and Water Content Tests in Soil Samples under positive temperature section difference initial aqueous rate in step 5023 Described point picture is carried out, soil sample resistivity and Water Content Tests in Soil Samples graph of relation under positive temperature section difference initial aqueous rate is drawn out；

Step 5025, in the EXCEL softwares of computer, to the positive temperature section difference initial aqueous rate drawn in step 5024 Lower soil sample resistivity carries out the curve of linear function, power function, exponential function and logarithmic function with Water Content Tests in Soil Samples relation curve Fitting, obtains multiple fit equations, and degree of fitting is defined as under positive temperature section difference initial aqueous rate closest to 1 fit equation The fit equation of soil sample resistivity and Water Content Tests in Soil Samples relation curve；

Step 503, freezing conditions experiment is carried out, measure the relation of subzero temperature section soil sample resistivity and temperature, detailed process is：

Step 5031, connection experimental facilities：The positive pole of ammeter is connected with the cathode output end of ac voltage regulator, will The negative pole of ammeter is connected with the conducting strip on the wall of soil sample box left and right sides side side, by the cathode output end of ac voltage regulator It is connected with the conducting strip on the wall of soil sample box left and right sides opposite side side；And by the positive pole of voltmeter and soil sample box left and right sides side Conducting strip connection on the wall of side, the negative pole of voltmeter is connected with the conducting strip on the wall of soil sample box left and right sides opposite side side；Will In the temperature measurement probe insertion temperature measurement probe hole connected on temperature measuring set；

Step 5032, respectively by multiple difference initial aqueous rates, the soil sample that temperature is between 20 DEG C~40 DEG C is placed on soil In sample box, inserted after tightly being wrapped up with preservative film in the household freezer that cryogenic temperature is -35 DEG C；Soil sample is inserted every time, all with temperature The temperature that measuring instrument is detected often reduces Δ T after reaching 0 DEG C₂Temperature T, voltage that temperature measuring set of thermograph is detected The registration U of the table and registration I of ammeter；Further according to formulaIt is calculated the corresponding soil samples of temperature T of each record Electricalresistivityρ；Wherein, Δ T₂Value be 1 DEG C~7 DEG C；

Step 5033, initially containing the temperature T recorded in step 5032 and the soil sample electricalresistivityρ that is calculated and soil sample In the EXCEL softwares of the corresponding input computer of water rate, soil sample resistivity and temperature under the different initial aqueous rates of subzero temperature section are formed Mapping table；

Step 5034, in the EXCEL softwares of computer, with temperature as abscissa, soil sample resistivity be ordinate, to step Soil sample resistivity carries out described point picture with the data of the mapping table of temperature under the different initial aqueous rates of subzero temperature section in rapid 5033, Draw out soil sample resistivity and temperature curve figure under the different initial aqueous rates of subzero temperature section；

Step 5035, in the EXCEL softwares of computer, to the different initial aqueous rate of subzero temperature section drawn in step 5034 Lower soil sample resistivity carries out the curve matching of linear function, power function, exponential function and logarithmic function with temperature curve, obtains To multiple fit equations, and fit equation by degree of fitting closest to 1 is defined as soil sample electricity under the different initial aqueous rates of subzero temperature section The fit equation of resistance rate and temperature curve；

Step 504, the relation derivation for carrying out content of unfrozen water in frozen earth and temperature under the different initial aqueous rates of subzero temperature section：Will step The fitting side of soil sample resistivity and Water Content Tests in Soil Samples relation curve under the positive temperature section difference initial aqueous rate determined in rapid 5025 The fitting side of soil sample resistivity and temperature curve under journey initial aqueous rate different from the subzero temperature section determined in step 5035 Cheng Jinhang simultaneous, solves Water Content Tests in Soil Samples and temperature relation equation under the different initial aqueous rates of subzero temperature section, due to subzero temperature section soil Sample moisture content is content of unfrozen water in frozen earth, therefore has solved content of unfrozen water in frozen earth under the different initial aqueous rates of subzero temperature section With temperature relation equation；

Step 505, the relational model for setting up frozen soil resistivity and temperature and content of unfrozen water in frozen earth, detailed process is：

Step 5051, the corresponding relation by soil sample resistivity and temperature under the different initial aqueous rates of subzero temperature section in step 5033 Temperature data in table substitutes into content of unfrozen water in frozen earth and temperature under the different initial aqueous rates of subzero temperature section solved in step 504 In relation equation, the corresponding content of unfrozen water in frozen earth of each temperature data under the different initial aqueous rates of subzero temperature section is solved, and will The EXCEL of temperature T, soil sample electricalresistivityρ and content of unfrozen water in frozen earth input computer corresponding with the initial aqueous rate of soil sample is soft In part, the mapping table of soil sample resistivity and temperature and content of unfrozen water in frozen earth under the different initial aqueous rates of subzero temperature section is formed；

Step 5052, according to soil sample resistivity and temperature and frozen soil under the different initial aqueous rate of subzero temperature section in step 5051 not The data frozen in the mapping table of water content, in the MATLAB softwares of computer, draw out soil sample resistivity and temperature with The diagram of block of content of unfrozen water in frozen earth, and the soil sample resistivity and the three-dimensional of temperature and content of unfrozen water in frozen earth that will be drawn out Surface chart is defined as the relational model of frozen soil resistivity and temperature and content of unfrozen water in frozen earth.

Above-mentioned method, it is characterised in that：Drying condition experiment is also carried out before step 502, positive temperature section soil sample electricity is measured The relation of resistance rate and temperature, detailed process is：

Step A, connection experimental facilities：The positive pole of ammeter is connected with the cathode output end of ac voltage regulator, by electricity The negative pole of flow table is connected with the conducting strip on the wall of soil sample box left and right sides side side, by the cathode output end of ac voltage regulator with Conducting strip connection on the wall of soil sample box left and right sides opposite side side；And by the positive pole of voltmeter and soil sample box left and right sides side side Conducting strip connection on wall, the negative pole of voltmeter is connected with the conducting strip on the wall of soil sample box left and right sides opposite side side；By temperature In the temperature measurement probe insertion temperature measurement probe hole connected on degree measuring instrument；

Step B, the soil sample of multiple difference initial aqueous rates is placed in soil sample box respectively, tightly wraps up rearmounted with preservative film Enter in vacuum drying chamber；Insert soil sample every time, all operate the control panel of vacuum drying chamber, make the temperature of vacuum drying chamber from 20 DEG C 40 DEG C, in temperature-rise period are risen to, every Δ T₁Temperature T that temperature measuring set of thermograph is detected, voltmeter The registration I of registration U and ammeter；Further according to formulaIt is calculated the corresponding soil sample resistance of temperature T of each record Rate ρ；Wherein, Δ T₁Value be 1 DEG C~7 DEG C；

The initial aqueous rate phase of step C, the temperature T that will be recorded in step B and the soil sample electricalresistivityρ that is calculated and soil sample In the EXCEL softwares of correspondence input computer, soil sample resistivity is corresponding with temperature under forming positive temperature section difference initial aqueous rate Relation table；

Step D, in the EXCEL softwares of computer, with temperature as abscissa, soil sample resistivity be ordinate, to step C In under positive temperature section difference initial aqueous rate soil sample resistivity carry out described point picture with the data of the mapping table of temperature, draw out Soil sample resistivity and temperature curve figure under positive temperature section difference initial aqueous rate.

Above-mentioned method, it is characterised in that：By soil under the different initial aqueous rates of subzero temperature section in step 5033 described in step 501 Sample resistivity initial aqueous different from the subzero temperature section solved in the temperature data substitution step 504 in the mapping table of temperature Under rate in content of unfrozen water in frozen earth and temperature relation equation, each temperature data pair under the different initial aqueous rates of subzero temperature section is solved After the content of unfrozen water in frozen earth answered, also by and by temperature T and content of unfrozen water in frozen earth it is corresponding with the initial aqueous rate of soil sample It is input into the EXCEL softwares of computer, forms the correspondence of temperature and content of unfrozen water in frozen earth under the different initial aqueous rates of subzero temperature section Relation table；And in the EXCEL softwares of computer, with temperature as abscissa, content of unfrozen water in frozen earth is ordinate, to subzero temperature section The data of the mapping table of temperature and content of unfrozen water in frozen earth carry out described point picture under different initial aqueous rates, draw out subzero temperature Temperature and content of unfrozen water in frozen earth graph of relation under Duan Butong initial aqueous rates.

Above-mentioned method, it is characterised in that：The conducting strip is copper sheet, and the range of the electronic balance is 1 kilogram, step The value of m is 0.5 gram in 5022.

Above-mentioned method, it is characterised in that：Δ T described in step B₁Value be 4 DEG C.

The present invention has advantages below compared with prior art：

1st, the simple structure of content of unfrozen water in frozen earth detecting system of the present invention based on soil body change in resistance, design is closed Reason, it is convenient to realize.

2nd, the use of content of unfrozen water in frozen earth detecting system of the present invention based on soil body change in resistance is easy to operate, detection The real-time of content of unfrozen water in frozen earth is high, can avoid influence of the irrelevant factor to testing result, and reliability is high, and can reflect The unfrozen water content Changing Pattern of different soil, different temperatures within the same time period, integrality is good.

3rd, the method and step of content of unfrozen water in frozen earth detection method of the present invention based on soil body change in resistance is simple, design Rationally, it is convenient to realize.

The method and step letter of frozen soil resistivity and the relational model of temperature and content of unfrozen water in frozen earth that the 4, the present invention is obtained Single, it is convenient to realize.

5th, the frozen soil resistivity and the method for the relational model of temperature and content of unfrozen water in frozen earth that the present invention is obtained use many Individual initial aqueous rate gradient, carries out the deduction of laboratory test and its correlation fitting formula, built frozen soil resistivity and Temperature and the relational model of content of unfrozen water in frozen earth, can be used in the content of unfrozen water in frozen earth based on frozen soil resistivity and temperature and survey Amount, the challenge that can be detected content of unfrozen water in frozen earth is simplified, and measurement result is accurate.

6th, the frozen soil resistivity and the method for the relational model of temperature and content of unfrozen water in frozen earth that the present invention is obtained are employed Nuclear magnetic resonance spectroscopy has carried out contrast experiment, as shown by data and result base of the invention with imaging system to the soil sample under the conditions of This coincide, and demonstrates the accuracy of result of the present invention.

7th, of the invention practical, using effect is good, is easy to promote the use of.

In sum, method of the present invention step is simple, and it is convenient to realize, the complexity that can be detected content of unfrozen water in frozen earth Question simplification, and measurement result is accurate, real-time and integrality are good, practical, and using effect is good, are easy to promote the use of.

Below by drawings and Examples, technical scheme is described in further detail.

Brief description of the drawings

Fig. 1 is the structural representation of content of unfrozen water in frozen earth detecting system in the embodiment of the present invention 1.

Fig. 2 is the structural representation of content of unfrozen water in frozen earth detecting system in the embodiment of the present invention 2.

Fig. 3 is the structural representation of detection unit in Example 1 and Example 2 of the present invention.

Fig. 4 is the top view of Fig. 3.

Fig. 5 is that the circuit of data acquisition transmission circuit, terrestrial data transmission terminal and computer in the embodiment of the present invention 1 connects Map interlinking.

Fig. 6 is that the circuit of data acquisition transmission circuit, terrestrial data transmission terminal and computer in the embodiment of the present invention 2 connects Map interlinking.

Fig. 7 is that the present invention obtains the experiment that frozen soil resistivity and temperature are used with the relational model of content of unfrozen water in frozen earth The annexation schematic diagram of equipment.

Fig. 8 is the method flow frame that the present invention obtains frozen soil resistivity and temperature and the relational model of content of unfrozen water in frozen earth Figure.

Fig. 9 is soil sample resistivity and temperature curve figure under the positive temperature section difference initial aqueous rate of the present invention.

Figure 10 is soil sample resistivity and Water Content Tests in Soil Samples graph of relation under the positive temperature section difference initial aqueous rate of the present invention.

Figure 11 is soil sample resistivity and temperature curve figure under the different initial aqueous rates of subzero temperature of the present invention section.

Figure 12 is temperature and content of unfrozen water in frozen earth graph of relation under the different initial aqueous rates of subzero temperature of the present invention section.

Figure 13 is the diagram of block of soil sample resistivity of the present invention and temperature and content of unfrozen water in frozen earth.

Figure 14 is the relation curve that varies with temperature of intensity of soil sample protium under NMR methods of the present invention difference initial aqueous rate Figure.

Figure 15 is temperature and content of unfrozen water in frozen earth relation curve under the different initial aqueous rates of NMR methods subzero temperature of the present invention section Figure.

Description of reference numerals:

1-detection unit；1-1-first sleeve；1-2-data acquisition circuit plate；

1-3-data acquisition transmission circuit；1-31-first microprocessor；

1-32-the first data storage；1-33-the first wireless communication module；

1-34-temperature measurement probe；1-35-resistivity measurement probe；

1-4-power line；1-5-the first conducting strip；1-6-the second conducting strip；

1-7-temperature measurement probe installing pipe；1-8-resistivity measurement probe installing pipe；

1-9-top board；1-10-the second sleeve pipe；The sleeve pipes of 1-11-the 3rd；

2-computer；3-terrestrial data transmission terminal；3-1-the second microprocessor；

3-2-the second data storage；3-3-usb communication circuit module；

3-4-the second wireless communication module；4-temperature and resistivity detecting device；

5-externally fed power supply；6-soil sample box；7-ac voltage regulator；

8-ammeter；9-voltmeter；10-wire connects conducting strip.

Specific embodiment

Embodiment 1

As shown in Fig. 1, Fig. 3, Fig. 4 and Fig. 5, the inspection of the content of unfrozen water in frozen earth based on soil body change in resistance of the present embodiment Examining system, including terrestrial data transmission terminal 3, computer 2 and the temperature for inserting in the soil body and resistivity detecting device 4, The temperature and resistivity detecting device 4 include a detection unit 1, and the detection unit 1 includes sleeve pipe 1-1 and data acquisition Circuit board 1-2, described sleeve pipe is by integrally formed first sleeve 1-1 from top to bottom, the second sleeve pipe 1-10 and the 3rd sleeve pipe 1-11 Composition, the external diameter of the external diameter less than the second sleeve pipe 1-10 of the first sleeve 1-1, the external diameter and the 3rd of the second sleeve pipe 1-10 The external diameter of sleeve pipe 1-11 is equal, the internal diameter of the internal diameter less than the 3rd sleeve pipe 1-11 of the second sleeve pipe 1-10, the first sleeve External screw thread is provided with the outer wall of 1-1, internal thread, the data acquisition circuit are provided with the inwall of the 3rd sleeve pipe 1-11 Plate 1-2 is arranged on the transition position of the second sleeve pipe 1-10 and the 3rd sleeve pipe 1-11, and number is integrated with the data acquisition circuit plate 1-2 It is each electricity consumption module for power supply in data acquisition transmission circuit 1-3 according to collection transmission circuit 1-3 and for connecting externally fed power supply 5 One end of power line 1-4, the power line 1-4 draw along the inwall of the second sleeve pipe 1-10 and the inwall of first sleeve 1-1 upwards Go out to first sleeve 1-1 tops and be connected with the first conducting strip 1-5, the other end of the power line 1-4 is connected with positioned at data Collecting circuit board 1-2 bottoms and for when the 3rd sleeve pipe 1-11 is threadedly coupled with first sleeve 1-1 with the first conducting strip 1-5 Second conducting strip 1-6 of docking, the data acquisition transmission circuit 1-3 include first microprocessor 1-31 and with first micro- place The first data storage 1-32 and the first wireless communication module 1-33, the data acquisition circuit plate 1-2 that reason device 1-31 connects On be fixedly connected with many stretch out the second sleeve pipe 1-10 and downwards vertically bending temperature measurement probe installing pipe 1-7 and Duo Gen stretch Go out the resistivity measurement probe installing pipe 1-8 of the second sleeve pipe 1-10 and bending vertically downwards, the temperature measurement probe installing pipe The temperature measurement probe 1-34 being connected with the input of first microprocessor 1-31, the resistance are provided with the vertical section of 1-7 The resistivity measurement being connected with the input of first microprocessor 1-31 is provided with the vertical section of rate measuring probe installing pipe 1-8 Probe 1-35；The terrestrial data transmission terminal 3 includes the second microprocessor 3-1 and connects with the second microprocessor 3-1 Second data storage 3-2, for the usb communication circuit module 3-3 that is connected and communicates with computer 2 and for it is first wireless Communication module 1-33 wireless connections and the second wireless communication module 3-4 for communicating.

As shown in Figure 3 and Figure 4, in the present embodiment, the quantity of the temperature measurement probe installing pipe 1-7 and resistivity measurement The quantity of probe installing pipe 1-8 is four, and four temperature measurement probe installing pipe 1-7 and four resistivity measurement probes are installed Pipe 1-8 is uniformly arranged on data acquisition circuit plate 1-2, and the temperature measurement probe installing pipe 1-7 and resistivity measurement are popped one's head in The spaced settings of installing pipe 1-8.

As shown in figure 3, in the present embodiment, the transition position of the first sleeve 1-1 and the second sleeve pipe 1-10 is provided with top board 1-9, the power line 1-4 pass through the top board 1-9.

In the present embodiment, the first microprocessor 1-31 is single-chip microcomputer.

The content of unfrozen water in frozen earth detection method based on soil body change in resistance of the present embodiment, comprises the following steps：

Step one, according to the height of frozen soil to be measured select detection unit 1 number be one；

Step 2, detection unit 1 is inserted in the soil body；

Step 3, the first conducting strip 1-5 is connected with the output end of external power source；

First microprocessor 1-31 in step 4, detection unit 1 enters to the temperature that temperature measurement probe 1-34 is detected Line period is gathered, and carries out periodicity collection to the resistivity that resistivity measurement probe 1-35 is detected, the temperature that will be collected Degrees of data and resistivity data are stored in the first data storage 1-32, and are sent to by the first wireless communication module 1-33 Terrestrial data transmission terminal 3, the second microprocessor 3-1 in terrestrial data transmission terminal 3 passes through the second wireless communication module 3-4 Temperature data and resistivity data that first microprocessor 1-31 sends are received, is stored in the second data storage 3-2, and lead to Cross usb communication circuit module 3-3 and be sent to computer 2；

Step 5, computer 2 are by temperature data and resistivity data input beforehand through being tested and processed experiment number According to the relational model of frozen soil resistivity and temperature with content of unfrozen water in frozen earth for obtaining, content of unfrozen water in frozen earth is obtained.Specifically During implementation, in the MATLAB softwares of computer 2, frozen soil resistivity and temperature are entered with the relational model of content of unfrozen water in frozen earth Row surface interpolation, using temperature data and resistivity data as known quantity, asks for content of unfrozen water in frozen earth.For example, as it is known that waiting to ask The existing coordinate points of four near point (coordinate value x, y, z represent), and known unknown point two coordinate values (i.e. known temperature Degrees of data and resistivity data, represent X and Y respectively), carry out surface interpolation, solve the 3rd coordinate value (the i.e. frozen soil of unknown point Unfrozen water content, is expressed as Z) MATLAB program representations it is as follows：

X=[2626]；

Y=[9.014.918.993.77]；

Z=[1671386223664325]；

X=3；

Y=2400；

E=0.05；E is precision

[xx, yy]=meshgrid (0:e:20,500:500e:30000)；

[m, n]=size (xx)；

Zz=griddata (x, y, z, xx, yy)；

X_i=ceil (find (abs (xx-X)<e/2,1)/m)；

Yy=yy '；

Y_i=ceil (find (abs (yy-Y)<e/2,1)/n)；

Z=zz (x_i, y_i)；

disp(Z)

As shown in figure 8, in the present embodiment, frozen beforehand through being tested and processed experimental data described in step 5 Native resistivity and temperature are comprised the following steps with the method for the relational model of content of unfrozen water in frozen earth：

Step 501, preparing experiment equipment, the experimental facilities include soil sample box 6, ac voltage regulator 7, ammeter 8, electricity Pressure table 9, vacuum drying chamber, electronic balance, household freezer and temperature measuring set, are connected with temperature survey spy on the temperature measuring set Head, being provided with the left and right sides side wall of the soil sample box 6 can be with the conducting strip of the end in contact of soil sample two in soil sample box 6 10, the temperature measurement probe hole for temperature measurement probe insertion is provided with the antetheca and/or rear wall of the soil sample box 6；

Step 5021, connection experimental facilities：As shown in fig. 7, by the positive pole of the positive pole of ammeter 8 and ac voltage regulator 7 Output end is connected, and conducting strip 10 is connected by wire on the negative pole of ammeter 8, in the cathode output end of ac voltage regulator 7 Conducting strip 10 is connected by wire；And the conducting strip 10 that the positive pole of voltmeter 9 is connected with the negative pole with ammeter 8 is connected, will The conducting strip 10 being connected with the negative pole with ac voltage regulator 7 is connected；During specific implementation, conducting strip 10 is with wire by soldering Mode is connected；

Step 5022, electronic balance is put into temperature no more than in 40 DEG C of vacuum drying chamber, and is put on electronic balance Upper soil sample support, is the quality of soil sample support by the read-record of now electronic balance, then respectively by multiple difference initial aqueous The soil sample of rate is placed in soil sample box 6, after soil sample box 6 is removed after soil sample stabilization shaping, will be connected with the negative pole of ammeter 8 by rubber band The conducting strip 10 for connecing and the conducting strip 10 being connected with the negative pole of ac voltage regulator 7 are separately fixed at the soil sample left and right sides, then Soil sample is inserted in vacuum drying chamber and is placed on soil sample support；Soil sample is inserted every time, electronic balance when all putting into soil sample Read-record is soil sample initial mass, and often reduces m mass as measuring point record instantaneous mass, an electricity with electronic balance reading Press the registration U of the table 9 and registration I of ammeter 8；Further according to formulaIt is calculated Water Content Tests in Soil Samples θ； And according to formulaIt is calculated the corresponding soil sample electricalresistivityρs of Water Content Tests in Soil Samples θ of each record；Wherein, C is dry ground Quality andA is soil sample initial mass, and B is the quality of soil sample support, and D is the instantaneous mass of measuring point record, w It is the initial aqueous rate of soil sample；L is the length of soil sample box 6, and S is the area of the left surface of soil sample box 6 or right flank；Specific implementation When, the soil sample support is glass supporter, by setting glass supporter, and after removal soil sample box 6 after soil sample stabilization shaping, it is to avoid Soil sample only has that upper surface is exposed dries uneven problem in vacuum drying chamber so that soil sample can be dried uniformly, so that The Water Content Tests in Soil Samples of more accurate science can be measured；

Step 5031, connection experimental facilities：As shown in fig. 7, by the positive pole of the positive pole of ammeter 8 and ac voltage regulator 7 Output end is connected, and the negative pole of ammeter 8 is connected with the conducting strip 10 on the left and right sides side side wall of soil sample box 6, and exchange is adjusted The cathode output end of voltage source 7 is connected with the conducting strip 10 on the left and right sides opposite side side wall of soil sample box 6；And by voltmeter 9 Positive pole is connected with the conducting strip 10 on the left and right sides side side wall of soil sample box 6, by the negative pole of voltmeter 9 and soil sample box 6 or so two Conducting strip 10 on the wall of side opposite side side is connected；The temperature measurement probe insertion temperature measurement probe that will be connected on temperature measuring set In hole；

Step 5032, respectively by multiple difference initial aqueous rates, the soil sample that temperature is between 20 DEG C~40 DEG C is placed on soil In sample box 6, inserted after tightly being wrapped up with preservative film in the household freezer that cryogenic temperature is -35 DEG C；Soil sample is inserted every time, all with temperature The temperature that measuring instrument is detected often reduces Δ T after reaching 0 DEG C₂Temperature T, voltage that temperature measuring set of thermograph is detected The registration U of the table 9 and registration I of ammeter 8；Further according to formulaIt is calculated the corresponding soil of temperature T of each record Sample electricalresistivityρ；Wherein, Δ T₂Value be 1 DEG C~7 DEG C；

In the present embodiment, drying condition experiment is also carried out before step 502, measure positive temperature section soil sample resistivity with temperature Relation, detailed process is：

Step A, connection experimental facilities：As shown in fig. 7, the positive pole of the positive pole of ammeter 8 and ac voltage regulator 7 is exported End connection, the negative pole of ammeter 8 is connected with the conducting strip 10 on the left and right sides side side wall of soil sample box 6, by AC voltage adjusting electricity The cathode output end in source 7 is connected with the conducting strip 10 on the left and right sides opposite side side wall of soil sample box 6；And by the positive pole of voltmeter 9 It is connected with the conducting strip 10 on the left and right sides side side wall of soil sample box 6, the negative pole of voltmeter 9 is another with the left and right sides of soil sample box 6 Conducting strip 10 on the wall of side side is connected；The temperature measurement probe insertion temperature measurement probe hole that will be connected on temperature measuring set It is interior；

Step B, the soil sample of multiple difference initial aqueous rates is placed in soil sample box 6 respectively, after tightly being wrapped up with preservative film Insert in vacuum drying chamber；Insert soil sample every time, all operate the control panel of vacuum drying chamber, make the temperature of vacuum drying chamber from 20 DEG C rise to 40 DEG C, in temperature-rise period, every Δ T₁Temperature T, voltmeter 9 that temperature measuring set of thermograph is detected Registration U and ammeter 8 registration I；Further according to formulaIt is calculated the corresponding soil sample electricity of temperature T of each record Resistance rate ρ；Wherein, Δ T₁Value be 1 DEG C~7 DEG C；Tightly wrapped up using preservative film and be prevented from soil sample moisture volatilization, improved and survey Accuracy of measurement；

By measuring the relation of positive temperature section soil sample resistivity and temperature, conclusion is can be derived that：Positive temperature section temperature is to soil sample electricity The influence of resistance rate is little, therefore in subsequent step, it is aqueous with soil sample by soil sample resistivity under positive temperature section difference initial aqueous rate The fitting side of soil sample resistivity and temperature curve under the fit equation of rate relation curve initial aqueous rate different from subzero temperature section Cheng Lianli, it becomes possible to determine content of unfrozen water in frozen earth and temperature relation side under the different initial aqueous rates of more accurate subzero temperature section Journey.

In the present embodiment, described in step 501 by soil sample resistivity under the different initial aqueous rate of subzero temperature section in step 5033 with Temperature data in the mapping table of temperature substitute into the different initial aqueous rates of subzero temperature section solved in step 504 under frozen soil not Freeze in water content and temperature relation equation, the corresponding frozen soil of each temperature data is not under solving the different initial aqueous rates of subzero temperature section Freeze after water content, also by and by temperature T and content of unfrozen water in frozen earth input computer corresponding with the initial aqueous rate of soil sample EXCEL softwares in, form the mapping table of temperature and content of unfrozen water in frozen earth under the different initial aqueous rate of subzero temperature section；And In the EXCEL softwares of computer, with temperature as abscissa, content of unfrozen water in frozen earth is ordinate, and subzero temperature section difference is initially contained The data of the mapping table of temperature and content of unfrozen water in frozen earth carry out described point picture under water rate, draw out subzero temperature section different initial Temperature and content of unfrozen water in frozen earth graph of relation under moisture content.

In the present embodiment, the conducting strip 10 is copper sheet, and the range of the electronic balance is 1 kilogram, m in step 5022 Value is 0.5 gram.

In the present embodiment, Δ T described in step B₁Value be 4 DEG C.

In order to verify the effect that the present invention can be produced, tested according to method of the present invention step, during experiment, choosing Take same soil control soil sample mineralogical composition the same, matching somebody with somebody for soil sample difference initial aqueous rate is carried out using the running water of identical component Put identical to ensure pore water self-resistance rate, the size of compacting requirement combination soil sample box 6 according to soil test handbook is done It is controlled to porosity.The native main physical indexes that experiment is used are as shown in table 1：

The main physical indexes of the experiment of table 1 soil

Title

Quality

Unit weight/gcm^-3

Particle diameter/mm

Dry density/gcm^-3

Uniformly count accurately

Coefficient of curvature

Loess

Clay

1.5

0.01

1.6

3.5

0.94

The model STG-500W of the ac voltage regulator 7 in experiment, regulation ac voltage regulator 7 is output as 100V friendships Stream electricity；Conducting strip 10 is copper sheet, and the range of electronic balance is 1 kilogram；

Drying condition experiment is carried out before step 502, when measuring the relation of positive temperature section soil sample resistivity and temperature, step B The moisture content of the soil sample of middle multiple difference initial aqueous rates is respectively 25%, 20%, 14%, 10% and 5%, Δ T₁Value be 4 DEG C, the value of L is 0.15m, and the value of S is 0.0025m²；Under the positive temperature section difference initial aqueous rate formed in selecting step C Partial data in the mapping table of soil sample resistivity (unit be Ω m) and temperature (unit be DEG C) is as shown in table 2：

The mapping table of soil sample resistivity and temperature under the positive temperature section of table 2 difference initial aqueous rate

Soil sample resistivity and temperature curve figure such as Fig. 9 under the positive temperature section difference initial aqueous rate drawn out in step D It is shown.

Drying condition experiment is carried out in step 502, when measuring the relation of positive temperature section soil sample resistivity and instantaneous moisture content, step In rapid 5022 the moisture content of the soil sample of multiple difference initial aqueous rates be respectively 25%, 20%, 14%, 10% and 5%, m take It is 0.5 gram to be worth, and the value of L is 0.15m, and the value of S is 0.0025m²；The positive temperature section formed in selecting step 5023 is different initial Partial data under moisture content in soil sample resistivity (unit is Ω m) and the mapping table of Water Content Tests in Soil Samples (unit is %) As shown in table 3：

The mapping table of soil sample resistivity and Water Content Tests in Soil Samples under the positive temperature section of table 3 difference initial aqueous rate

Soil sample resistivity is bent with Water Content Tests in Soil Samples relation under the positive temperature section difference initial aqueous rate drawn out in step 5024 Line chart is as shown in Figure 10.

Soil sample resistivity is bent with Water Content Tests in Soil Samples relation under the positive temperature section difference initial aqueous rate determined in step 5025 The fit equation of line is as shown in table 4：

The fit equation table of soil sample resistivity and Water Content Tests in Soil Samples relation curve under the different initial aqueous rates of table 4

Soil sample	Fit equation	Degree of fitting R²
			Initial aqueous rate 25%	ρ=5557.4 θ^-1.476	0.9281
Initial aqueous rate 20%	ρ=4181.7 θ^-1.296	0.8825
			Initial aqueous rate 14%	ρ=4751.9 θ^-1.216	0.8967
Initial aqueous rate 10%	ρ=5176.1 θ^-0.991	0.9123
			Initial aqueous rate 5%	ρ=6361.2 θ^-0.802	0.9421

Freezing conditions experiment is carried out in step 503, when measuring the relation of subzero temperature section soil sample resistivity and temperature, step 5032 The moisture content of the soil sample of middle multiple difference initial aqueous rates is respectively 25%, 20%, 14%, 10% and 5%, Δ T₂Value be 2 DEG C, the value of S is 0.0025m²；Soil sample resistivity is (single under the different initial aqueous rates of subzero temperature section formed in selecting step 5033 Position is Ω m) it is as shown in table 5 with partial data in the mapping table of temperature (unit be DEG C)：

The mapping table of soil sample resistivity and temperature under 5 jiaos of temperature section difference initial aqueous rates of table

Soil sample resistivity is with temperature curve figure such as under the different initial aqueous rate of subzero temperature section drawn out in step 5034 Shown in Figure 11.

The plan of soil sample resistivity and temperature curve under the different initial aqueous rates of subzero temperature section determined in step 5035 Close equation as shown in table 6：

The fit equation table of soil sample resistivity and temperature curve under the different initial aqueous rates of the subzero temperature of table 6 section

Sample	Fit equation	Degree of fitting R²
			Initial aqueous rate 5%	ρ=2376.2e^-0.127T	0.9763
Initial aqueous rate 10%	ρ=1818.6e^-0.134T	0.9798
			Initial aqueous rate 14%	ρ=1532.6e^-0.138T	0.9788
Initial aqueous rate 20%	ρ=1254.1e^-0.139T	0.9733
			Initial aqueous rate 25%	ρ=1154.2e^-0.143T	0.9743

Content of unfrozen water in frozen earth is with temperature relation equation such as under the different initial aqueous rate of subzero temperature section solved in step 504 Shown in table 7：

Content of unfrozen water in frozen earth and temperature relation equation table under the different initial aqueous rates of the subzero temperature of table 7 section

Sample	Fit equation	Degree of fitting R²
			Initial aqueous rate 5%	θ=4.096e^0.1568T	0.9421
Initial aqueous rate 10%	θ=6.663e^0.1695T	0.9266
			Initial aqueous rate 14%	θ=6.869e^0.1569T	0.8904
Initial aqueous rate 20%	θ=8.858e^0.1683T	0.8772
			Initial aqueous rate 25%	θ=9.570e^0.1675T	0.8587

When the relational model of frozen soil resistivity and temperature and content of unfrozen water in frozen earth is set up in step 505, selecting step 501 The correspondence of temperature under the different initial aqueous rate of subzero temperature section of middle formation (unit for DEG C) and content of unfrozen water in frozen earth (unit is %) Partial data in relation table is as shown in table 8：

The mapping table of temperature and content of unfrozen water in frozen earth under the different initial aqueous rates of the subzero temperature of table 8 section

Temperature and content of unfrozen water in frozen earth graph of relation under the different initial aqueous rates of subzero temperature section drawn out in step 501 As shown in figure 12.

Soil sample resistivity (unit is Ω m) and temperature under the different initial aqueous rates of subzero temperature section formed in selecting step 501 Degree (unit for DEG C) is as shown in table 9 with partial data in the mapping table of content of unfrozen water in frozen earth (unit is %)：

The mapping table of soil sample resistivity and temperature and content of unfrozen water in frozen earth under the different initial aqueous rates of the subzero temperature of table 9 section

In step 502 in the MATLAB softwares of computer, draw out soil sample resistivity and temperature and do not freeze water with frozen soil and contain The MATLAB programs that the diagram of block of amount is used for：

θ=[25 12.26 5.28 2.30 2.84 1.86 1.76 20 9.01 4.91 2.48 1.95 1.70 1.50 14 8.99 3.77 2.39 1.83 1.57 1.37 10 6.73 2.37 1.73 1.53 1.46 1.26 5 3.94 1.60 1.61 1.21 1.29 1.09]

T=[0-1-5-8-10-15-20 0-1-5-8-10-15-20 0-1-5-8-10-15 -20 0 -1 -5 -8 -10 -15 -20 0 -1 -5 -8 -10 -15 -20]

ρ=[887 1,550 3,754 5,168 8,985 13,454 19,417 984 1,671 3,862 5,361 9,194 12521 20436 1197 2366 4325 5685 10675 16521 25265 1453 2874 4678 6217 12947 18611 27392 1973 3977 5165 7213 15675 22321 31292]

[X, Y]=meshgrid (0：0.01：0.3, -20：1：0)

Z=griddata (θ, T, ρ, X, Y)

Surf (X, Y, Z)

Diagram of block such as Figure 13 institutes of soil sample resistivity and temperature and content of unfrozen water in frozen earth are drawn out in step 502 Show.

In order to evaluate the reliability of the method for the present invention, the conclusion that above-mentioned experiment is obtained is verified using NMR methods.Tool Body process is：Using be configured with the MacroMR12-150H-1 nuclear magnetic resonance spectroscopies of temperature control system and imaging system carry out with Content of unfrozen water in frozen earth varies with temperature the measure of relation under the above-mentioned same initial aqueous rate gradient of experiment, specifically, in advance The soil sample that 5 groups of initial aqueous rates of configuration are respectively 5%, 10%, 14%, 20%, 25% is freezed in household freezer, regulation freezing Case temperature, makes soil sample be kept for 30 minutes in each temperature of the measurement section temperature, it is fully freezed.When being measured to soil sample, lead to The intensity that nuclear magnetic resonance spectroscopy and imaging system record protium is crossed, temperature is recorded by temperature control system, and will recorded In the EXCEL softwares of temperature input computer corresponding with the intensity of protium, soil sample temperature under different initial aqueous rates is formed With the mapping table of the intensity of protium；Again in the EXCEL softwares of computer, with temperature as abscissa, protium it is strong It is ordinate to spend, and the data to the mapping table of the intensity of soil sample temperature and protium under different initial aqueous rates carry out described point Draw, draw out graph of relation such as Figure 14 that the intensity of soil sample protium under NMR methods difference initial aqueous rate is varied with temperature It is shown；Again in the EXCEL softwares of computer, the pass varied with temperature to the intensity of soil sample protium under different initial aqueous rates It is that positive temperature section in curve map carries out linear function fit, obtains the intensity of soil sample protium under positive temperature section difference initial aqueous rate The fit equation of the relation curve for varying with temperature is as shown in table 10：

Intensity (the Y of soil sample protium under the positive temperature section of table 10 difference initial aqueous rate_s) with the relation curve of temperature (T) change Fit equation table

Sample	Fit equation	Degree of fitting R²
			Initial aqueous rate 5%	Y_s=-1.563T+2569.5	0.1381
Initial aqueous rate 10%	Y_s=-1.037T+4635.7	0.0284
			Initial aqueous rate 14%	Y_s=-136.28T+8304.3	0.8369
Initial aqueous rate 20%	Y_s=-146.3T+8921.9	0.9746
			Initial aqueous rate 25%	Y_s=-263.27T+15141	0.9386

According to formulaThe intensity of soil sample protium under positive temperature section difference initial aqueous rate is varied with temperature The fit equation of relation curve is converted to content of unfrozen water in frozen earth and temperature relation equation under different initial aqueous rates；Wherein, w is The initial aqueous rate of soil sample, θ is content of unfrozen water in frozen earth, Y_sIt is to bring certain temperature value into soil sample protium that fit equation is obtained Intensity, Y_nTo use the intensity of nuclear magnetic resonance spectroscopy and the protium of imaging system record at a temperature of certain；Temperature is brought into again Under different initial aqueous rates in content of unfrozen water in frozen earth and temperature relation equation, the corresponding frozen soil of each temperature data is solved not Freeze water content, and the EXCEL of temperature and content of unfrozen water in frozen earth input computer corresponding with the initial aqueous rate of soil sample is soft In part, the mapping table of temperature and content of unfrozen water in frozen earth under the different initial aqueous rates of subzero temperature section is formed；And in computer In EXCEL softwares, with temperature as abscissa, content of unfrozen water in frozen earth is ordinate, to temperature under the different initial aqueous rates of subzero temperature section The data of the mapping table of degree and content of unfrozen water in frozen earth carry out described point picture, draw out NMR methods subzero temperature section difference and initially contain Temperature and content of unfrozen water in frozen earth graph of relation are as shown in figure 15 under water rate.

Comparison diagram 15 and Figure 12 can be seen that under the different initial aqueous rates of the subzero temperature section drawn out by the method for the present invention Under temperature and content of unfrozen water in frozen earth graph of relation initial aqueous rate different from the subzero temperature section drawn out using NMR methods temperature and Content of unfrozen water in frozen earth graph of relation curve is basically identical, illustrates that the accuracy of the inventive method disclosure satisfy that actually used need Ask.

Embodiment 2

As shown in Figure 2 and Figure 6, the content of unfrozen water in frozen earth detecting system based on soil body change in resistance of the present embodiment, As different from Example 1：The temperature and resistivity detecting device 4 include the detection unit 1 of multiple mounted on top, up and down phase Two adjacent detection units 1 are connected by way of first sleeve 1-1 is threadedly coupled with the 3rd sleeve pipe 1-11, and remaining structure is equal It is same as Example 1.

The content of unfrozen water in frozen earth detection method based on soil body change in resistance of the present embodiment is different from embodiment 1 It is：

Step one, according to the height of frozen soil to be measured select detection unit 1 number for multiple；

Step 2, multiple detection units 1 are first connected as an entirety, then will be connected as an entirety multiple detections it is single Unit 1 is inserted in the soil body, and by the perpendicular of the vertical section of temperature measurement probe installing pipe 1-7 and resistivity measurement probe installing pipe 1-8 Straight section is adjusted to straight down；Or, first a detection unit 1 to be inserted in the soil body, a detection for reconnecting top is single Unit 1, until the connection of all of detection unit 1 is placed into the soil body, and by the vertical section of temperature measurement probe installing pipe 1-7 and The vertical section of resistivity measurement probe installing pipe 1-8 is adjusted to straight down.

Remaining step is same as Example 1.

In the present embodiment, described in step 5 beforehand through tested and processed experimental data obtain frozen soil resistivity and Temperature is same as Example 1 with the method for the relational model of content of unfrozen water in frozen earth.

The above, is only presently preferred embodiments of the present invention, and not the present invention is imposed any restrictions, every according to the present invention Any simple modification, change and equivalent structure change that technical spirit is made to above example, still fall within skill of the present invention In the protection domain of art scheme.

Claims

1. a kind of content of unfrozen water in frozen earth detecting system based on soil body change in resistance, it is characterised in that：Including ground data Transmission terminal (3), computer (2) and temperature and resistivity detecting device (4) for inserting in the soil body, the temperature and resistance Detection unit (1) of the rate detection means (4) including a detection unit (1) or multiple mounted on top, detection unit (1) bag Sleeve pipe (1-1) and data collecting circuit board (1-2) are included, described sleeve pipe is by integrally formed first sleeve (1-1) from top to bottom, Two sleeve pipes (1-10) and the 3rd sleeve pipe (1-11) are constituted, and the external diameter of the first sleeve (1-1) is less than the second sleeve pipe (1-10) External diameter, the external diameter of second sleeve pipe (1-10) is equal with the external diameter of the 3rd sleeve pipe (1-11), second sleeve pipe (1-10) Internal diameter is provided with external screw thread, described 3rd set less than the internal diameter of the 3rd sleeve pipe (1-11) on the outer wall of the first sleeve (1-1) Internal thread is provided with the inwall for managing (1-11), two inspections neighbouring when the quantity of the detection unit (1) is multiple Survey unit (1) to be connected by way of first sleeve (1-1) is threadedly coupled with the 3rd sleeve pipe (1-11), the data acquisition electricity Road plate (1-2) is arranged on the transition position of the second sleeve pipe (1-10) and the 3rd sleeve pipe (1-11), the data acquisition circuit plate (1-2) On be integrated with data acquisition transmission circuit (1-3) and be data acquisition transmission circuit (1-3) for connecting externally fed power supply (5) In each electricity consumption module for power supply power line (1-4), one end of the power line (1-4) is upwards along the inwall of the second sleeve pipe (1-10) First sleeve (1-1) top is drawn out to the inwall of first sleeve (1-1) and be connected with the first conducting strip (1-5), the power supply The other end of line (1-4) is connected with positioned at data acquisition circuit plate (1-2) bottom and for by the 3rd sleeve pipe (1-11) and the The second conducting strip (1-6) that sleeve (1-1) is docked when being threadedly coupled with the first conducting strip (1-5), the data acquisition transmission Circuit (1-3) includes first microprocessor (1-31) and the first data storage connected with first microprocessor (1-31) (1-32) and the first wireless communication module (1-33), is fixedly connected with many and stretches out on the data acquisition circuit plate (1-2) Two sleeve pipes (1-10) and downwards vertically bending temperature measurement probe installing pipe (1-7) and many stretch out the second sleeve pipe (1-10) and Resistivity measurement probe installing pipe (1-8) of bending vertically downwards, in the vertical section of the temperature measurement probe installing pipe (1-7) It is provided with the temperature measurement probe (1-34) being connected with the input of first microprocessor (1-31), the resistivity measurement probe The resistivity measurement probe being connected with the input of first microprocessor (1-31) is provided with the vertical section of installing pipe (1-8) (1-35)；The terrestrial data transmission terminal (3) including the second microprocessor (3-1) and with the second microprocessor (3-1) phase The second data storage (3-2) for connecing, for the usb communication circuit module (3-3) that is connected and communicates with computer (2) and it is used for With the first wireless communication module (1-33) wireless connection and the second wireless communication module (3-4) for communicating.

2., according to the content of unfrozen water in frozen earth detecting system based on soil body change in resistance described in claim 1, its feature exists In：The quantity of the temperature measurement probe installing pipe (1-7) and the quantity of resistivity measurement probe installing pipe (1-8) are four Root, four temperature measurement probe installing pipes (1-7) and four resistivity measurements probe installing pipe (1-8) are uniformly arranged on data and adopt On collector plate (1-2), the temperature measurement probe installing pipe (1-7) and resistivity measurement pop one's head in installing pipe (1-8) each other Every setting.

3., according to the content of unfrozen water in frozen earth detecting system based on soil body change in resistance described in claim 1, its feature exists In：The first sleeve (1-1) is provided with top board (1-9) with the transition position of the second sleeve pipe (1-10), and the power line (1-4) is worn Cross the top board (1-9).

4., according to the content of unfrozen water in frozen earth detecting system based on soil body change in resistance described in claim 1, its feature exists In：The first microprocessor (1-31) is single-chip microcomputer.

5. it is a kind of that the content of unfrozen water in frozen earth detection based on soil body change in resistance is carried out using device as claimed in claim 1 Method, it is characterised in that the method is comprised the following steps：

Step one, the number that detection unit (1) is selected according to the height of frozen soil to be measured；

Step 2, when detection unit (1) number be one when, directly detection unit (1) is inserted in the soil body；Work as detection unit (1) when number is for multiple, multiple detection units (1) are first connected as an entirety, then a multiple for entirety will be connected as Detection unit (1) is inserted in the soil body, and the vertical section of temperature measurement probe installing pipe (1-7) and resistivity measurement probe are installed The vertical section for managing (1-8) is adjusted to straight down；Or, first a detection unit (1) is inserted in the soil body, reconnect top A detection unit (1), until all of detection unit (1) connection is placed into the soil body, and temperature measurement probe is pacified The vertical section of tubulature (1-7) and the vertical section of resistivity measurement probe installing pipe (1-8) are adjusted to straight down；

Step 3, the first conducting strip (1-5) is connected with the output end of external power source；

The temperature that first microprocessor (1-31) in step 4, detection unit (1) is detected to temperature measurement probe (1-34) Periodicity collection is carried out, and periodicity collection is carried out to the resistivity that resistivity measurement probe (1-35) is detected, will collected Temperature data and resistivity data storage in the first data storage (1-32), and by the first wireless communication module (1- 33) terrestrial data transmission terminal (3) is sent to, the second microprocessor (3-1) in terrestrial data transmission terminal (3) passes through second Wireless communication module (3-4) receives the temperature data and resistivity data that first microprocessor (1-31) sends, and stores second In data storage (3-2), and computer (2) is sent to by usb communication circuit module (3-3)；

Step 5, computer (2) are by temperature data and resistivity data input beforehand through being tested and processed experimental data In the frozen soil resistivity and temperature of acquisition and the relational model of content of unfrozen water in frozen earth, content of unfrozen water in frozen earth is obtained.

6. in accordance with the method for claim 5, it is characterised in that：Beforehand through being tested and processed reality described in step 5 Test data acquisition frozen soil resistivity and temperature is comprised the following steps with the method for the relational model of content of unfrozen water in frozen earth：

Step 501, preparing experiment equipment, the experimental facilities include soil sample box (6), ac voltage regulator (7), ammeter (8), Voltmeter (9), vacuum drying chamber, electronic balance, household freezer and temperature measuring set, are connected with temperature survey on the temperature measuring set Amount probe, being provided with the left and right sides side wall of the soil sample box (6) can be with the end in contact of soil sample two in soil sample box (6) Conducting strip (10), the temperature survey being provided with the antetheca and/or rear wall of the soil sample box (6) for temperature measurement probe insertion is visited Head bore；

Step 502, drying condition experiment is carried out, measure the relation of positive temperature section soil sample resistivity and instantaneous moisture content, detailed process For：

Step 5021, connection experimental facilities：The positive pole of ammeter (8) is connected with the cathode output end of ac voltage regulator (7), Conducting strip (10) is connected by wire on the negative pole of ammeter (8), in the cathode output end of ac voltage regulator (7) by leading Line connects conducting strip (10)；And conducting strip (10) connection that the positive pole of voltmeter (9) is connected with the negative pole with ammeter (8), Conducting strip (10) connection that will be connected with the negative pole with ac voltage regulator (7)；

Step 5022, electronic balance is put into temperature no more than in 40 DEG C of vacuum drying chamber, and soil is put on electronic balance Sample support, is the quality of soil sample support by the read-record of now electronic balance, then respectively by multiple difference initial aqueous rates Soil sample is placed in soil sample box (6), after soil sample box (6) is removed after soil sample stabilization shaping, will be with the negative pole of ammeter (8) by rubber band The conducting strip (10) of connection and the conducting strip (10) being connected with the negative pole of ac voltage regulator (7) are separately fixed at soil sample or so two Side, soil sample then inserted in vacuum drying chamber and be placed on soil sample support；Soil sample is inserted every time, electronics when all putting into soil sample The read-record of balance is soil sample initial mass, and it is instantaneous as a measuring point record often to reduce m mass with electronic balance reading The registration I of quality, the registration U of voltmeter (9) and ammeter (8)；Further according to formulaIt is calculated soil Sample moisture content θ；And according to formulaIt is calculated the corresponding soil sample electricalresistivityρs of Water Content Tests in Soil Samples θ of each record；Its In, C for dry ground quality andA is soil sample initial mass, and B is the quality of soil sample support, and D is measuring point record Instantaneous mass, w is the initial aqueous rate of soil sample；L is the length of soil sample box (6), and S is soil sample box (6) left surface or right flank Area；

The initial aqueous rate of step 5023, the Water Content Tests in Soil Samples θ that will be calculated in step 5022 and soil sample electricalresistivityρ and soil sample In the EXCEL softwares of corresponding input computer, soil sample resistivity is aqueous with soil sample under forming positive temperature section difference initial aqueous rate The mapping table of rate；

Step 5024, in the EXCEL softwares of computer, with Water Content Tests in Soil Samples as abscissa, soil sample resistivity be ordinate, it is right Soil sample resistivity is carried out with the data of the mapping table of Water Content Tests in Soil Samples under positive temperature section difference initial aqueous rate in step 5023 Described point is drawn, and draws out soil sample resistivity and Water Content Tests in Soil Samples graph of relation under positive temperature section difference initial aqueous rate；

Step 5025, in the EXCEL softwares of computer, to soil under the positive temperature section difference initial aqueous rate drawn in step 5024 Sample resistivity carries out the curve matching of linear function, power function, exponential function and logarithmic function with Water Content Tests in Soil Samples relation curve, Obtain multiple fit equations, and fit equation by degree of fitting closest to 1 is defined as soil sample under positive temperature section difference initial aqueous rate The fit equation of resistivity and Water Content Tests in Soil Samples relation curve；

Step 5031, connection experimental facilities：The positive pole of ammeter (8) is connected with the cathode output end of ac voltage regulator (7), The negative pole of ammeter (8) is connected with the conducting strip (10) on the wall of soil sample box (6) left and right sides side side, by ac voltage regulator (7) cathode output end is connected with the conducting strip (10) on the wall of soil sample box (6) left and right sides opposite side side；And by voltmeter (9) Positive pole be connected with the conducting strip (10) on the wall of soil sample box (6) left and right sides side side, by the negative pole of voltmeter (9) and soil sample box (6) conducting strip (10) connection on the wall of left and right sides opposite side side；The temperature measurement probe insertion that will be connected on temperature measuring set In temperature measurement probe hole；

Step 5032, respectively by multiple difference initial aqueous rates, the soil sample that temperature is between 20 DEG C~40 DEG C is placed on soil sample box (6) in, inserted after tightly being wrapped up with preservative film in the household freezer that cryogenic temperature is -35 DEG C；Soil sample is inserted every time, is all surveyed with temperature The temperature that amount instrument is detected often reduces Δ T after reaching 0 DEG C₂Temperature T, voltmeter that temperature measuring set of thermograph is detected (9) registration U and the registration I of ammeter (8)；Further according to formulaIt is calculated the corresponding soil of temperature T of each record Sample electricalresistivityρ；Wherein, Δ T₂Value be 1 DEG C~7 DEG C；

Step 5033, by the temperature T recorded in step 5032 and the soil sample electricalresistivityρ that is calculated and the initial aqueous rate of soil sample In the EXCEL softwares of corresponding input computer, soil sample resistivity is right with temperature under forming the different initial aqueous rates of subzero temperature section Answer relation table；

Step 5034, in the EXCEL softwares of computer, with temperature as abscissa, soil sample resistivity be ordinate, to step Soil sample resistivity carries out described point picture with the data of the mapping table of temperature under the different initial aqueous rates of subzero temperature section in 5033, paints Make soil sample resistivity and temperature curve figure under the different initial aqueous rates of subzero temperature section；

Step 5035, in the EXCEL softwares of computer, to soil under the different initial aqueous rate of subzero temperature section drawn in step 5034 Sample resistivity carries out the curve matching of linear function, power function, exponential function and logarithmic function with temperature curve, obtains many Individual fit equation, and fit equation by degree of fitting closest to 1 is defined as soil sample resistivity under the different initial aqueous rates of subzero temperature section With the fit equation of temperature curve；

Step 504, the relation derivation for carrying out content of unfrozen water in frozen earth and temperature under the different initial aqueous rates of subzero temperature section：By step The fit equation of soil sample resistivity and Water Content Tests in Soil Samples relation curve under the positive temperature section difference initial aqueous rate determined in 5025 The fit equation of soil sample resistivity and temperature curve under initial aqueous rates different from the subzero temperature section determined in step 5035 Simultaneous is carried out, Water Content Tests in Soil Samples and temperature relation equation under the different initial aqueous rates of subzero temperature section is solved, due to subzero temperature section soil sample Moisture content is content of unfrozen water in frozen earth, thus solved under the different initial aqueous rates of subzero temperature section content of unfrozen water in frozen earth with Temperature relation equation；

Step 5051, by the mapping table of soil sample resistivity and temperature under the different initial aqueous rate of subzero temperature section in step 5033 Temperature data substitute into content of unfrozen water in frozen earth and temperature relation under the different initial aqueous rate of subzero temperature section solved in step 504 In equation, the corresponding content of unfrozen water in frozen earth of each temperature data under the different initial aqueous rate of subzero temperature section is solved, and by temperature In the EXCEL softwares of T, soil sample electricalresistivityρ and content of unfrozen water in frozen earth input computer corresponding with the initial aqueous rate of soil sample, The mapping table of soil sample resistivity and temperature and content of unfrozen water in frozen earth under the different initial aqueous rates of formation subzero temperature section；

Step 5052, water is not frozen according to soil sample resistivity and temperature and frozen soil under the different initial aqueous rate of subzero temperature section in step 5051 Data in the mapping table of content, in the MATLAB softwares of computer, draw out soil sample resistivity and temperature and frozen soil The diagram of block of unfrozen water content, and the soil sample resistivity that will draw out and temperature and content of unfrozen water in frozen earth three-dimension curved surface Figure is defined as the relational model of frozen soil resistivity and temperature and content of unfrozen water in frozen earth.

7. in accordance with the method for claim 6, it is characterised in that：Drying condition experiment is also carried out before step 502, is measured just The relation of temperature section soil sample resistivity and temperature, detailed process is：

Step A, connection experimental facilities：The positive pole of ammeter (8) is connected with the cathode output end of ac voltage regulator (7), will The negative pole of ammeter (8) is connected with the conducting strip (10) on the wall of soil sample box (6) left and right sides side side, by ac voltage regulator (7) cathode output end is connected with the conducting strip (10) on the wall of soil sample box (6) left and right sides opposite side side；And by voltmeter (9) Positive pole be connected with the conducting strip (10) on the wall of soil sample box (6) left and right sides side side, by the negative pole of voltmeter (9) and soil sample box (6) conducting strip (10) connection on the wall of left and right sides opposite side side；The temperature measurement probe insertion that will be connected on temperature measuring set In temperature measurement probe hole；

Step B, the soil sample of multiple difference initial aqueous rates is placed in soil sample box (6) respectively, tightly wraps up rearmounted with preservative film Enter in vacuum drying chamber；Insert soil sample every time, all operate the control panel of vacuum drying chamber, make the temperature of vacuum drying chamber from 20 DEG C 40 DEG C, in temperature-rise period are risen to, every Δ T₁Temperature T, voltmeter (9) that temperature measuring set of thermograph is detected Registration U and ammeter (8) registration I；Further according to formulaIt is calculated the corresponding soil samples of temperature T of each record Electricalresistivityρ；Wherein, Δ T₁Value be 1 DEG C~7 DEG C；L is the length of soil sample box (6), and S is soil sample box (6) left surface or right side The area in face；

Step C, the temperature T and the soil sample electricalresistivityρ that is calculated that will be recorded in step B are corresponding with the initial aqueous rate of soil sample It is input into the EXCEL softwares of computer, forms the corresponding relation of soil sample resistivity and temperature under positive temperature section difference initial aqueous rate Table；

Step D, in the EXCEL softwares of computer, with temperature as abscissa, soil sample resistivity be ordinate, in step C just Soil sample resistivity carries out described point picture with the data of the mapping table of temperature under temperature section difference initial aqueous rate, draws out positive temperature Soil sample resistivity and temperature curve figure under Duan Butong initial aqueous rates.

8. in accordance with the method for claim 6, it is characterised in that：It is described in step 501 that subzero temperature section in step 5033 is different just Temperature data under beginning moisture content in the mapping table of soil sample resistivity and temperature substitutes into the subzero temperature section solved in step 504 Under different initial aqueous rates in content of unfrozen water in frozen earth and temperature relation equation, solve each under the different initial aqueous rates of subzero temperature section After the corresponding content of unfrozen water in frozen earth of individual temperature data, also by and by temperature T and content of unfrozen water in frozen earth it is initial with soil sample In the EXCEL softwares of the corresponding input computer of moisture content, temperature and frozen soil do not freeze under the different initial aqueous rates of formation subzero temperature section The mapping table of water content；And in the EXCEL softwares of computer, with temperature as abscissa, content of unfrozen water in frozen earth is vertical Coordinate, the data to the mapping table of temperature and content of unfrozen water in frozen earth under the different initial aqueous rates of subzero temperature section carry out described point picture Figure, draws out temperature and content of unfrozen water in frozen earth graph of relation under the different initial aqueous rates of subzero temperature section.

9. in accordance with the method for claim 6, it is characterised in that：The conducting strip (10) is copper sheet, the electronic balance Range is 1 kilogram, and the value of m is 0.5 gram in step 5022.

10. in accordance with the method for claim 7, it is characterised in that：Δ T described in step B₁Value be 4 DEG C.