CN106771082B

CN106771082B - Content of unfrozen water in frozen earth detecting system and method based on soil body change in resistance

Info

Publication number: CN106771082B
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: 2017-10-03
Anticipated expiration: 2037-01-17
Also published as: CN106771082A

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 for inserting temperature and resistivity detecting device in the soil body, temperature and resistivity detecting device include a detection unit or the detection unit of multiple mounted on top, detection unit includes being integrated with data acquisition transmission circuit and power line on sleeve pipe and data collecting circuit board, 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.The realization of the present invention is convenient, and the challenge that can detect content of unfrozen water in frozen earth is simplified, and measurement result is accurate, and 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 explanations to systematic science, therefore for academic research and engineering practice, this is a urgent problem to be solved.

The content of unfrozen water in frozen earth method of testing that this current 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 utilizes the signal source in magnetic resonance, and free damping occurs after first radio-frequency pulse, passes through decay 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 It is set to carry out heat exchange in warm calorimetric water, specimen temperature reaches balance with calorimetric coolant-temperature gage, its test apparatus complex operation, and needs Certain heat exchanger time is wanted, therefore can not be facilitated, the instantaneous content for not freezing water is quickly measured.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 The sampling at enough time points, to set up accurate multidimensional inverse model, 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 As a result the data measured are only 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 integrated The test equipment for considering content of unfrozen water in frozen earth changing rule 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, which rises, can cause the thawing of original ice in the soil body, both, which change, can all cause the change of unfrozen water content, and this Individual change proves that most direct mode is resistivity with experiment, and more than zero degrees celsius, temperature change can cause ice in the soil body Melt moisture evaporation so that free water content is reduced, 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 Go out temperature, resistivity and the relation do not frozen between water water content, and known using testing temperature and resistivity and do not freeze water water content, The technical barrier of water moisture measurement will be solved not freeze well, still, in the prior art, also lack suitable detecting system and Method.

The content of the invention

In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing a kind of structure letter It is single, realize challenge that is convenient, content of unfrozen water in frozen earth being detected simplify and measurement result it 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 first sleeve are less than the external diameter of the second sleeve pipe, described second set The external diameter of pipe is equal with the external diameter of the 3rd sleeve pipe, and the internal diameter of second sleeve pipe is less than the internal diameter of the 3rd sleeve pipe, the first set It is provided with the outer wall of pipe on external screw thread, the inwall of the 3rd sleeve pipe and is provided with internal thread, when the quantity of the detection unit For it is multiple when neighbouring two detection units be connected by way of first sleeve is connected with the 3rd casing threads, it is described Data acquisition circuit plate is arranged on the transition position of the second sleeve pipe and the 3rd sleeve pipe, the data acquisition circuit plate and is integrated with data Gather transmission circuit and for connecting power line of the externally fed power supply for each electricity consumption module for power supply in data acquisition transmission circuit, One end of the power line is drawn out at the top of first sleeve 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 when being threadedly coupled with first sleeve with the first conducting strip, the data acquisition transmission circuit includes first Microprocessor and the first data storage and the first wireless communication module connected with first microprocessor, the data acquisition The many temperature measurement probe installing pipes and Duo Gen stretched out the second sleeve pipe and bent vertically downwards are fixedly connected with circuit board to stretch The resistivity measurement probe installing pipe for going out 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 The second data storage for connecting including the second microprocessor and with the second microprocessor, for being connected and communicating with computer 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 spaced setting of resistivity measurement probe 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 plate, and the power line passes through the top plate.

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 this method comprises the following steps：

Step 1: selecting the number of detection unit according to the height of frozen soil to be measured；

Step 2: when the number of detection unit is one, directly detection unit is inserted in the soil body；When detection unit When number is multiple, multiple detection units are first connected as an entirety, then the multiple detection units that will be connected as an entirety 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 externally fed power supply；

Step 4: the temperature that the first microprocessor in detection unit is detected to temperature measurement probe periodically adopt Collection, and the resistivity detected of being popped one's head in resistivity measurement carries out periodicity collection, by the temperature data collected and resistivity 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 is sent by the second wireless communication module According to and resistivity data, be stored in the second data storage, and computer is sent to by usb communication circuit module；

Step 5: computer by temperature data and resistivity data input beforehand through being tested and handle experiment number According 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 handle experimental data obtain The method of the relational model of frozen soil resistivity and temperature and content of unfrozen water in frozen earth comprises the following steps：

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

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

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

Step 5022, electronic balance is put into vacuum drying chamber of the temperature no more than 40 DEG C, and put on electronic balance Upper soil sample support, by the quality that the read-record of now electronic balance is soil sample support, then respectively by multiple different initial aqueous The soil sample of rate is placed in soil sample box, after removing soil sample box after the stable shaping of soil sample, is connected the negative pole with ammeter by rubber band Conducting strip and be separately fixed at the soil sample left and right sides with the conducting strip that the negative pole of ac voltage regulator is connected, 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 For soil sample initial mass, and m mass is often reduced using electronic balance reading shown as measuring point record instantaneous mass, voltmeter Number U and ammeter registration I；Further according to formulaCalculating obtains Water Content Tests in Soil Samples θ；And according to formulaCalculate the corresponding soil sample electricalresistivityρs of Water Content Tests in Soil Samples θ recorded every time；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 that measuring point is recorded, 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 initial of obtained Water Content Tests in Soil Samples θ and soil sample electricalresistivityρ and soil sample will be calculated in step 5022 contain In the EXCEL softwares of the corresponding input computer of water rate, soil sample resistivity and soil sample under the different initial aqueous rates of positive temperature section are formed The mapping table of moisture content；

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

Step 5025, in the EXCEL softwares of computer, initial aqueous rates different to the positive temperature section 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 the different initial aqueous rates of positive temperature section closest to 1 fit equation Soil sample resistivity and the fit equation of Water Content Tests in Soil Samples relation curve；

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

Step 5031, connection experimental facilities：The cathode output end of the positive pole of ammeter and ac voltage regulator is connected, 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 different 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 formulaCalculate the corresponding soil sample electricity of the temperature T recorded every time Resistance rate ρ；Wherein, Δ T₂Value be 1 DEG C~7 DEG C；

Step 5033, the soil sample electricalresistivityρ that the temperature T recorded in step 5032 and calculating are obtained and the initial of soil sample contain 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, using temperature as abscissa, soil sample resistivity be ordinate, to step The data of the mapping table of soil sample resistivity and temperature carry out described point picture 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, Multiple fit equations are obtained, and degree of fitting is defined as soil sample under the different initial aqueous rates of subzero temperature section closest to 1 fit equation The fit equation of resistivity and temperature curve；

Content of unfrozen water in frozen earth and the relation derivation of temperature under step 504, the different initial aqueous rates of progress subzero temperature section：Will step Soil sample resistivity and the fitting side of Water Content Tests in Soil Samples relation curve under the different initial aqueous rates of positive temperature section 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 by the soil sample resistivity and temperature drawn out and the three-dimensional of content of unfrozen water in frozen earth 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 cathode output end of the positive pole of ammeter and ac voltage regulator is connected, 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 different initial aqueous rates is placed in soil sample box 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 that temperature measuring set of thermograph is detected Registration U and ammeter registration I；Further according to formulaCalculate the corresponding soil sample resistance of temperature T recorded every time Rate ρ；Wherein, Δ T₁Value be 1 DEG C~7 DEG C；

Step C, the soil sample electricalresistivityρ that the temperature T recorded in step B and calculating are obtained and the initial aqueous rate phase of soil sample In the EXCEL softwares of correspondence input computer, soil sample resistivity under the different initial aqueous rates of positive temperature section is formed corresponding with temperature Relation table；

Step D, in the EXCEL softwares of computer, using temperature as abscissa, soil sample resistivity be ordinate, to step C In under the different initial aqueous rates of positive temperature section the data of the mapping table of soil sample resistivity and temperature carry out described point picture, 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 under the different initial aqueous rates of subzero temperature section in step 5033 described in step 5051 Soil sample resistivity is different from the subzero temperature section solved in the temperature data substitution step 504 in the mapping table of temperature initially to be contained Content of unfrozen water in frozen earth is with temperature relation equation, solving each temperature data under the different initial aqueous rates of subzero temperature section under water rate It is also that temperature T and content of unfrozen water in frozen earth and the initial aqueous rate of soil sample is corresponding defeated after corresponding content of unfrozen water in frozen earth In the EXCEL softwares for entering computer, the correspondence pass of temperature and content of unfrozen water in frozen earth under the different initial aqueous rates of subzero temperature section is formed It is table；And in the EXCEL softwares of computer, using temperature as abscissa, content of unfrozen water in frozen earth is ordinate, to subzero temperature section not Data with the mapping table of temperature and content of unfrozen water in frozen earth under initial aqueous rate carry out described point picture, draw out subzero temperature section Temperature and content of unfrozen water in frozen earth graph of relation under different 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 M value 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 content of unfrozen water in frozen earth detecting system of the invention based on soil body change in resistance is simple in construction, and design is closed Reason, it is convenient to realize.

2nd, the use of the content of unfrozen water in frozen earth detecting system of the 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, reliability is high, and can reflect The unfrozen water content changing rule of different soil, different temperatures within the same period, integrality is good.

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

4th, the present invention is obtained frozen soil resistivity and the method and step letter of the relational model of temperature and content of unfrozen water in frozen earth 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 are using more Individual initial aqueous rate gradient, carries out the deduction of laboratory test and its correlation fitting formula, built frozen soil resistivity and The relational model of temperature and 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 surveys Amount, the challenge that can detect 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, the result base of as shown by data and the present invention to the soil sample with the conditions of with imaging system This coincide, and demonstrates the accuracy of result of the present invention.

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

In summary, method and step of the invention is simple, and it is convenient to realize, the complexity that can detect 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 Fig. 3 top view.

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.

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

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

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

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

The relation curve that Figure 14 varies with temperature for the intensity of soil sample protium under the different initial aqueous rates of NMR methods of the present invention 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 units；1-1- first sleeves；1-2- data acquisition circuit plates；

1-3- data acquisition transmission circuits；1-31- first microprocessors；

The data storages of 1-32- first；The wireless communication modules of 1-33- first；

1-34- temperature measurement probes；1-35- resistivity measurements are popped one's head in；

1-4- power lines；The conducting strips of 1-5- first；The conducting strips of 1-6- second；

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

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

2- computers；3- terrestrial data transmission terminals；The microprocessors of 3-1- second；

The data storages of 3-2- second；3-3-USB communication circuit modules；

The wireless communication modules of 3-4- second；4- temperature and resistivity detecting device；

5- externally fed power supplys；6- soil sample boxes；7- ac voltage regulators；

8- ammeters；9- voltmeters；10- wires connect conducting strip.

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 for inserting temperature and resistivity detecting device 4 in the soil body, The temperature and resistivity detecting device 4 include a detection unit 1, and the detection unit 1 includes sleeve pipe 1-1 and data are adopted Collector plate 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 compositions, the external diameter of the first sleeve 1-1 is less than the second sleeve pipe 1-10 external diameter, the external diameter of the second sleeve pipe 1-10 and the Three sleeve pipe 1-11 external diameter is equal, and the internal diameter of the second sleeve pipe 1-10 is less than the 3rd sleeve pipe 1-11 internal diameter, the first set It is provided with pipe 1-1 outer wall on external screw thread, the inwall of the 3rd sleeve pipe 1-11 and is provided with internal thread, the data acquisition electricity Road plate 1-2 is arranged on the second sleeve pipe 1-10 and the 3rd sleeve pipe 1-11 transition position, the data acquisition circuit plate 1-2 and is integrated with Data acquisition transmission circuit 1-3 and supplied for connecting externally fed power supply 5 for each electricity consumption module in data acquisition transmission circuit 1-3 The power line 1-4, the power line 1-4 of electricity one end are upwards along the second sleeve pipe 1-10 inwall and first sleeve 1-1 inwall The other end for being drawn out at the top of first sleeve 1-1 and being connected with the first conducting strip 1-5, the power line 1-4 is connected with positioned at number According to collecting circuit board 1-2 bottoms and for when the 3rd sleeve pipe 1-11 is threadedly coupled with first sleeve 1-1 and the first conducting strip Second conducting strip 1-6 of 1-5 docking, the data acquisition transmission circuit 1-3 include first microprocessor 1-31 and with first The first data storage 1-32 and the first wireless communication module 1-33 that microprocessor 1-31 connects, the data acquisition circuit plate The many temperature measurement probe installing pipe 1-7 for stretching out the second sleeve pipe 1-10 and bending vertically downwards are fixedly connected with 1-2 and many The resistivity measurement probe installing pipe 1-8 that root stretches out the second sleeve pipe 1-10 and bent vertically downwards, the temperature measurement probe peace The temperature measurement probe 1-34 being connected with first microprocessor 1-31 input is provided with tubulature 1-7 vertical section, it is described The resistivity being connected with first microprocessor 1-31 input is provided with resistivity measurement probe installing pipe 1-8 vertical section Measuring probe 1-35；The terrestrial data transmission terminal 3 include the second microprocessor 3-1 and with the second microprocessor 3-1 phases 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 for first Wireless communication module 1-33 wireless connections and the second wireless communication module 3-4 communicated.

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 Installing pipe of popping one's head in 1-8 quantity 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, the temperature measurement probe installing pipe 1-7 and resistivity measurement probe Installing pipe 1-8 is spaced to be set.

As shown in figure 3, in the present embodiment, the first sleeve 1-1 and the second sleeve pipe 1-10 transition position are provided with top plate 1-9, the power line 1-4 pass through the top plate 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 1: selecting the number of detection unit 1 to be one according to the height of frozen soil to be measured；

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 externally fed power supply；

Step 4: the first microprocessor 1-31 in detection unit 1 enters to the temperature measurement probe 1-34 temperature detected Line period is gathered, and the resistivity that the 1-35 that popped one's head in resistivity measurement is detected carries out periodicity collection, by the temperature collected Degrees of data and resistivity data storage are sent into the first data storage 1-32, and by the first wireless communication module 1-33 The second microprocessor 3-1 in terrestrial data transmission terminal 3, terrestrial data transmission terminal 3 passes through the second wireless communication module 3-4 Temperature data and resistivity data that first microprocessor 1-31 is sent 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 by temperature data and resistivity data input beforehand through being tested and handle experiment number According 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.Specifically During implementation, in the MATLAB softwares of computer 2, the relational model of frozen soil resistivity and temperature and content of unfrozen water in frozen earth is entered 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 Four near point existing coordinate points (coordinate value x, y, z represent), and two coordinate values of known unknown point are (i.e. known warm Degrees of data and resistivity data, represent X and Y respectively), surface interpolation is carried out, the 3rd coordinate value (the i.e. frozen soil of unknown point is solved Unfrozen water content, is expressed as Z) MATLAB program representations it is as follows：

X=[2 62 6]；

Y=[9.01 4.91 8.99 3.77]；

Z=[1,671 3,862 2,366 4325]；

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 described in step 5 beforehand through being tested and handle experimental data The method of the relational model of native resistivity and temperature and content of unfrozen water in frozen earth comprises the following steps：

Step 501, preparing experiment equipment, the experimental facilities include soil sample box 6, ac voltage regulator 7, ammeter 8, electricity Press and temperature survey spy is connected with table 9, vacuum drying chamber, electronic balance, household freezer and temperature measuring set, the temperature measuring set Be provided with head, 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 measurement probe hole inserted for temperature measurement probe 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；, will and the conducting strip 10 for being connected the positive pole of voltmeter 9 with the negative pole with ammeter 8 is connected The conducting strip 10 being connected with the negative pole with ac voltage regulator 7 is connected；When it is implemented, conducting strip 10 passes through soldering with wire Mode is connected；

Step 5022, electronic balance is put into vacuum drying chamber of the temperature no more than 40 DEG C, and put on electronic balance Upper soil sample support, by the quality that the read-record of now electronic balance is soil sample support, then respectively by multiple different initial aqueous The soil sample of rate is placed in soil sample box 6, after removing soil sample box 6 after the stable shaping of soil sample, will be connected by rubber band with the negative pole of ammeter 8 The conducting strip 10 connect 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 using electronic balance reading Press the registration U of table 9 and the registration I of ammeter 8；Further according to formulaCalculating obtains Water Content Tests in Soil Samples θ； And according to formulaCalculate the corresponding soil sample electricalresistivityρs of Water Content Tests in Soil Samples θ recorded every time；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 that measuring point is recorded, w For 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 the stable shaping of soil sample, it is to avoid Soil sample only has the problem of upper surface is exposed to dry uneven 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 connected on temperature measuring set is inserted into temperature measurement probe In hole；

Step 5032, respectively by multiple different 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 formulaCalculate the corresponding soil samples of temperature T recorded every time Electricalresistivityρ；Wherein, Δ T₂Value be 1 DEG C~7 DEG C；

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

In the present embodiment, drying condition experiment is also carried out before step 502, positive temperature section soil sample resistivity and temperature is measured 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 and the left and right sides of soil sample box 6 is another Conducting strip 10 on the wall of side side is connected；By the temperature measurement probe connected on temperature measuring set insertion temperature measurement probe hole It is interior；

Step B, the soil sample of multiple different 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 formulaCalculate the corresponding soil sample electricity of the temperature T recorded every time Resistance rate ρ；Wherein, Δ T₁Value be 1 DEG C~7 DEG C；Tightly being wrapped up using preservative film can prevent soil sample moisture from volatilizing, and improve and survey Accuracy of measurement；

By measuring the relation of positive temperature section soil sample resistivity and temperature, conclusion 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 by soil sample resistivity under the different initial aqueous rates of positive temperature section and soil sample 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 5051 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 substitutes under the different initial aqueous rates of subzero temperature section solved in step 504 frozen soil not Freeze in water content and temperature relation equation, solve under the different initial aqueous rates of subzero temperature section the corresponding frozen soil of each temperature data not Freeze after water content, also by temperature T and content of unfrozen water in frozen earth input computer corresponding with the initial aqueous rate of soil sample In EXCEL softwares, 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 meter In the EXCEL softwares of calculation machine, using temperature as abscissa, content of unfrozen water in frozen earth is ordinate, initial aqueous different 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 rate, draw out subzero temperature section difference and initially contain Temperature and content of unfrozen water in frozen earth graph of relation under water rate.

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

The main physical indexes of the experiment of table 1 soil

The model STG-500W of 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 In the moisture content of soil sample of multiple different initial aqueous rates be respectively 25%, 20%, 14%, 10% and 5%, Δ T₁Value be 4 DEG C, L value is 0.15m, and S value is 0.0025m²；Under the different initial aqueous rates of positive temperature section formed in selecting step C Partial data in the mapping table of soil sample resistivity (unit is Ω m) and temperature (unit for 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 different initial aqueous rates of positive temperature section drawn out in step D It is shown.

Drying condition experiment is carried out in step 502, when measuring positive temperature section soil sample resistivity and the relation of instantaneous moisture content, step The moisture content of the soil sample of multiple different initial aqueous rates is respectively that 25%, 20%, 14%, 10% and 5%, m take in rapid 5022 It is worth for 0.5 gram, L value is 0.15m, and S value is 0.0025m²；The positive temperature section formed in selecting step 5023 is different initial Soil sample resistivity (unit is Ω m) and the partial data in the mapping table of Water Content Tests in Soil Samples (unit is %) under moisture content 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 and Water Content Tests in Soil Samples relation are bent under the different initial aqueous rates of positive temperature section drawn out in step 5024 Line chart is as shown in Figure 10.

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

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

In step 503 carry out freezing conditions experiment, measure subzero temperature section soil sample resistivity and temperature relation when, step 5032 In the moisture content of soil sample of multiple different initial aqueous rates be respectively 25%, 20%, 14%, 10% and 5%, Δ T₂Value be 2 DEG C, S value is 0.0025m²；Soil sample resistivity is (single under the different initial aqueous rates of subzero temperature section formed in selecting step 5033 Position be 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 the different initial aqueous rates of the subzero temperature of table 5 section

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

Soil sample resistivity and the plan of 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

Under the different initial aqueous rate of subzero temperature section solved in step 504 content of unfrozen water in frozen earth with temperature relation equation such as 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

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) and partial data in the mapping table of content of unfrozen water in frozen earth (unit is %) are as shown in table 9：

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 method of the invention, the conclusion obtained using NMR methods to above-mentioned experiment is verified.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 Configure the soil sample that 5 groups of initial aqueous rates are respectively 5%, 10%, 14%, 20%, 25% in household freezer to freeze, regulation freezing Case temperature, makes soil sample be kept for 30 minutes in each measure temperature 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 by record 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, using temperature as abscissa, protium it is strong Spend for ordinate, the data to the mapping table of soil sample temperature and the intensity of 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 the different initial aqueous rates of NMR methods is varied with temperature It is shown；Again in the EXCEL softwares of computer, the pass that the intensity to soil sample protium under different initial aqueous rates is varied with temperature It is the positive temperature section progress linear function fit in curve map, obtains the intensity of soil sample protium under the different initial aqueous rates of positive temperature section The fit equation of the relation curve varied 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

According to formulaThe intensity of soil sample protium under the different initial aqueous rates of positive temperature section 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_sTo bring certain temperature value into soil sample protium that fit equation is obtained Intensity, Y_nFor the intensity of the protium recorded at a temperature of certain using nuclear magnetic resonance spectroscopy with imaging system；Temperature is brought into again Content of unfrozen water in frozen earth is with temperature relation equation, solving the corresponding frozen soil of each temperature data not under different initial aqueous rates 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, using temperature as abscissa, content of unfrozen water in frozen earth is ordinate, temperature under initial aqueous rates different to 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 actual use is needed 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 first sleeve 1-1 by way of the 3rd sleeve pipe 1-11 threaded connections, 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 1: selecting the number of detection unit 1 to be multiple according to the height of frozen soil to be measured；

Step 2: multiple detection units 1 first are connected as into an entirety, then the multiple detection lists that will be connected as an entirety Member 1 is inserted in the soil body, and temperature measurement probe installing pipe 1-7 vertical section and resistivity measurement are popped one's head in the perpendicular of installing pipe 1-8 Straight section is adjusted to straight down；Or, first a detection unit 1 is inserted in the soil body, a detection for reconnecting top is single Member 1, until all connections of detection unit 1 are placed into the soil body, and by temperature measurement probe installing pipe 1-7 vertical section and Resistivity measurement probe installing pipe 1-8 vertical section is adjusted to straight down.

Remaining step is same as Example 1.

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

It is described above, only it is presently preferred embodiments of the present invention, not the present invention is imposed any restrictions, it is 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 for inserting temperature and resistivity detecting device (4), the temperature and resistance in the soil body Rate detection means (4) includes the detection unit (1) of 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) composition, the external diameter of the first sleeve (1-1) are 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, which is less than on the internal diameter of the 3rd sleeve pipe (1-11), the outer wall of the first sleeve (1-1), is provided with external screw thread, described 3rd set Internal thread is provided with the inwall for managing (1-11), two neighbouring inspections when the quantity of the detection unit (1) is multiple Survey unit (1) first sleeve (1-1) by way of the threaded connection of the 3rd sleeve pipe (1-11) to be connected, 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 for connecting externally fed power supply (5) for data acquisition transmission circuit (1-3) In each electricity consumption module for power supply power line (1-4), one end of the power line (1-4) is upwards along the second sleeve pipe (1-10) inwall It is drawn out to the inwall of first sleeve (1-1) at the top of first sleeve (1-1) and is 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) Many are fixedly connected with (1-32) and the first wireless communication module (1-33), the data acquisition circuit plate (1-2) and stretches out the Two sleeve pipes (1-10) and the temperature measurement probe installing pipe (1-7) bent vertically downwards and many second sleeve pipes of stretching (1-10) are simultaneously In the resistivity measurement probe installing pipe (1-8) bent vertically downwards, 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) include 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 quantity of the temperature measurement probe installing pipe (1-7) and resistivity measurement probe installing pipe (1-8) is four Root, four temperature measurement probe installing pipes (1-7) and four resistivity measurement probe installing pipes (1-8) are uniformly arranged on data and adopted On collector plate (1-2), the temperature measurement probe installing pipe (1-7) and resistivity measurement probe installing pipe (1-8) are 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) and the transition position of the second sleeve pipe (1-10) are provided with top plate (1-9), and the power line (1-4) is worn Cross the top plate (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. a kind of carry out the content of unfrozen water in frozen earth detection based on soil body change in resistance using device as claimed in claim 1 Method, it is characterised in that this method comprises the following steps：

Step 1: selecting the number of detection unit (1) according to the height of frozen soil to be measured；

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

Step 3: the first conducting strip (1-5) is connected with the output end of externally fed power supply；

Step 4: the temperature that the first microprocessor (1-31) in 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 be collected Temperature data and resistivity data store into the first data storage (1-32), and pass through the first wireless communication module (1- 33) the second microprocessor (3-1) being sent in terrestrial data transmission terminal (3), 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) is sent, and is stored in second In data storage (3-2), and computer (2) is sent to by usb communication circuit module (3-3)；

Step 5: computer (2) by temperature data and resistivity data input beforehand through being tested and handle 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 handle reality described in step 5 The method for testing the relational model that data obtain frozen soil resistivity and temperature and content of unfrozen water in frozen earth comprises the following steps：

Step 501, preparing experiment equipment, the experimental facilities include soil sample box (6), ac voltage regulator (7), ammeter (8), Temperature survey is connected with voltmeter (9), vacuum drying chamber, electronic balance, household freezer and temperature measuring set, the temperature measuring set Being provided with amount probe, 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) The temperature survey inserted for temperature measurement probe is provided with conducting strip (10), the antetheca and/or rear wall of the soil sample box (6) to visit Head bore；

Step 502, progress drying condition experiment, 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), On the negative pole of ammeter (8) by wire connect conducting strip (10), ac voltage regulator (7) cathode output end by leading Line connection conducting strip (10)；And the conducting strip (10) for being connected the positive pole of voltmeter (9) with the negative pole with ammeter (8) is connected, By the conducting strip (10) being connected with the negative pole with ac voltage regulator (7) connection；

Step 5022, electronic balance is put into vacuum drying chamber of the temperature no more than 40 DEG C, and puts on electronic balance soil Sample support, by the quality that the read-record of now electronic balance is soil sample support, then respectively by multiple different initial aqueous rates Soil sample is placed in soil sample box (6), after removing soil sample box (6) after the stable shaping of soil sample, by rubber band by the negative pole with ammeter (8) 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 using electronic balance reading often reduce m mass for measuring point record instantaneously The registration I of quality, the registration U of voltmeter (9) and ammeter (8)；Further according to formulaCalculating is obtained Water Content Tests in Soil Samples θ；And according to formulaCalculate the corresponding soil sample electricalresistivityρs of Water Content Tests in Soil Samples θ recorded every time； Wherein, C for dry ground quality andA is soil sample initial mass, and B is the quality of soil sample support, and D records for measuring point Instantaneous mass, w be soil sample initial aqueous rate；L is the length of soil sample box (6), and S is soil sample box (6) left surface or right flank Area；

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

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

Step 5025, in the EXCEL softwares of computer, soil under initial aqueous rates different to the positive temperature section 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, Multiple fit equations are obtained, and degree of fitting is defined as soil sample under the different initial aqueous rates of positive temperature section closest to 1 fit equation Resistivity and the fit equation of 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；By the temperature measurement probe connected on temperature measuring set insertion In temperature measurement probe hole；

Step 5032, respectively by multiple different 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 formulaCalculate the temperature T recorded every time corresponding Soil sample electricalresistivityρ；Wherein, Δ T₂Value be 1 DEG C~7 DEG C；

The initial aqueous rate of step 5033, the soil sample electricalresistivityρ that the temperature T recorded in step 5032 and calculating are obtained and soil sample In the EXCEL softwares of corresponding input computer, pair of soil sample resistivity and temperature under the different initial aqueous rates of subzero temperature section is formed Answer relation table；

Step 5034, in the EXCEL softwares of computer, using temperature as abscissa, soil sample resistivity be ordinate, to step The data of the mapping table of soil sample resistivity and temperature carry out described point picture under the different initial aqueous rates of subzero temperature section in 5033, paint 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 degree of fitting is defined as soil sample resistivity under the different initial aqueous rates of subzero temperature section closest to 1 fit equation With the fit equation of temperature curve；

Content of unfrozen water in frozen earth and the relation derivation of temperature under step 504, the different initial aqueous rates of progress subzero temperature section：By step Soil sample resistivity and the fit equation of Water Content Tests in Soil Samples relation curve under the different initial aqueous rates of positive temperature section determined in 5025 Soil sample resistivity and the fit equation of 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 rate 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, Form 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；

Step 5052, water do 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 by the soil sample resistivity and temperature drawn out and the three-dimension curved surface of content of unfrozen water in frozen earth 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；By the temperature measurement probe connected on temperature measuring set insertion In temperature measurement probe hole；

Step B, the soil sample of multiple different 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 that temperature measuring set of thermograph is detected, voltmeter (9) Registration U and ammeter (8) registration I；Further according to formulaCalculate the corresponding soil samples of temperature T recorded every time 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 soil sample electricalresistivityρ for obtaining the temperature T recorded in step B and calculating are corresponding with the initial aqueous rate of soil sample In the EXCEL softwares for inputting computer, the corresponding relation of soil sample resistivity and temperature under the different initial aqueous rates of positive temperature section is formed Table；

Step D, in the EXCEL softwares of computer, using temperature as abscissa, soil sample resistivity be ordinate, in step C just The data of the mapping table of soil sample resistivity and temperature carry out described point picture under temperature section difference initial aqueous rate, draw 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 5051 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 Content of unfrozen water in frozen earth is each under the different initial aqueous rates of subzero temperature section with temperature relation equation, solving under different initial aqueous rates After the corresponding content of unfrozen water in frozen earth of individual temperature data, also by temperature T and content of unfrozen water in frozen earth and the initial aqueous of soil sample In the EXCEL softwares of the corresponding input computer of rate, form temperature and frozen soil under the different initial aqueous rates of subzero temperature section and do not freeze water and contain The mapping table of amount；And in the EXCEL softwares of computer, using temperature as abscissa, content of unfrozen water in frozen earth is ordinate, The data of the mapping table of temperature and content of unfrozen water in frozen earth carry out described point picture under initial aqueous rates different to subzero temperature section, paint Make 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 m value 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.