CN106770418B - The device and method that Rock And Soil internal moisture migrates in monitoring frozen-thaw process in real time - Google Patents

The device and method that Rock And Soil internal moisture migrates in monitoring frozen-thaw process in real time Download PDF

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Publication number
CN106770418B
CN106770418B CN201710161630.0A CN201710161630A CN106770418B CN 106770418 B CN106770418 B CN 106770418B CN 201710161630 A CN201710161630 A CN 201710161630A CN 106770418 B CN106770418 B CN 106770418B
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temperature
sample
rock
nuclear
cooler
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CN106770418A (en
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贾海梁
杨更社
奚家米
唐丽云
申艳军
叶万军
田俊峰
杨培强
韩芊
彭宇
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Xian University of Science and Technology
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N24/00Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
    • G01N24/08Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects by using nuclear magnetic resonance
    • G01N24/081Making measurements of geologic samples, e.g. measurements of moisture, pH, porosity, permeability, tortuosity or viscosity

Abstract

The invention discloses the device and method that Rock And Soil internal moisture in a kind of frozen-thaw process of monitoring in real time migrates, including NMR system, temperature control system and water charging system, the NMR system includes nuclear magnetic resonance main frame, the nuclear-magnetism coil being positioned in the detection cabin of nuclear magnetic resonance main frame, the nuclear-magnetism coil is the cylindrical shape that both ends are open, the both ends of nuclear-magnetism coil are provided with detachable end, heat-insulation layer is provided with the inwall of the nuclear-magnetism coil, the heat-insulation layer is internally provided with sample room, the temperature control system includes computer, data acquisition module, cooler and temperature controller, the quantity of the cooler is two, two coolers are symmetrically mounted on the inside of the end cap at nuclear-magnetism coil both ends.Detect in frozen-thaw process different zones moisture Phase velocity map in Rock And Soil in real time using apparatus and method of the present invention, real-time, the accurate measurement of unfrozen water content at sample interior arbitrary section can be achieved, Rock And Soil sample structure will not be destroyed.

Description

The device and method that Rock And Soil internal moisture migrates in monitoring frozen-thaw process in real time
Technical field
The invention belongs to Rock And Soil internal moisture migration research technical field, and in particular to a kind of monitoring frozen-thaw process in real time The device and method of middle Rock And Soil internal moisture migration.
Background technology
With the deep implementation of national " land Silk Road New Economy band " strategy and " development of the West Regions " strategy, following number 10 years, western part of China will carry out large-scale infrastructure construction.Above-mentioned area is more in seasons (for many years) such as plateau, mountain regions Property freeze thawing area, unfreezing are strong.Damage deterioration of the Rock And Soil under unfreezing can trigger a series of engineering geological problems. The mechanism for causing Rock And Soil freezing-thawing damage mainly has two kinds:First, the volumetric expansion machine in the freezing process of hole (crack) water original position System;Second, the segregated ice mechanism that Wei Dong Shui Xiangzhengdong areas migrate and frozen.Domestic and foreign scholars are it is believed that with layer crystallization and not It is the main reason for causing body frost heaving and structure to be destroyed to freeze water migration as the segregated ice mechanism of principal character.Rock freeze thawing is damaged The research for hindering mechanism relatively lags behind, and thinks that volumetric expansion mechanism plays a leading role in a very long time, but with Fukuda, Murton and Duca et al. observed segregated ice phenomenon in rock, and segregated ice mechanism does not freeze the migration of water particularly in rock Effect in freezing-thawing damage is gradually taken seriously.Therefore, the water translocation process in frozen-thaw process inside Rock And Soil is studied, is to disclose The key link of Rock And Soil freezing-thawing damage mechanism, there is important theory and engineering significance.
On the driving force of Rock And Soil internal moisture migration, domestic and foreign scholars propose various vacations since 19 end of the centurys Say mainly have:Thermograde gesture, pressure potential, gravitational potential, osmotic potential, matric potential etc..Specific in frozen-thaw process, segregation potential is then Play a leading role.According to Konrad and Morgenstern theory, segregation potential is determined by thermograde gesture and pressure.Can See, the theoretical research for the migration of Rock And Soil internal moisture is more abundant, but experimental study famine.It is real using interior Test the internal moisture migration of research Rock And Soil and face lot of challenges, be primarily present following problem:
(1) indoor freezing condition is difficult to simulate natural freezing-thawing.The freeze thawing of Rock And Soil mainly has two under natural conditions Kind pattern, depending on inside whether there is permafrost haorizon.If being not present permafrost haorizon inside stratum, freeze thawing is from outward appearance to inner essence unidirectional Freeze thawing, surface temperature are in periodic sinusoidal variations, are then constant positive temperature inside stratum.If permafrost haorizon inside stratum be present, Then freeze may be by inner and table Unidirectional Freezing, or both ends carry out simultaneously it is two-way freeze, but melt and be still then from outward appearance to inner essence It is unidirectional, surface temperature still changes in periodic sinusoidal, is then constant subzero temperature inside stratum.Existing scheme is more permanent using one end Fixed positive temperature, the design of the constant positive temperature of the other end, can not effectively simulate natural freezing-thawing.Such as Application No. 201510299172.8 patent discloses moisture transition process follow-up mechanism and its experimental method in a kind of frozen soil, and it is used The temperature control scheme of the constant positive temperature of minus temperature, lower end is held, the water translocation of inside soil body under nature freezing-thawing can not be studied;Shen Number it please disclose phase transition process temperature and resistivity distribution in a kind of experiment of measuring frozen for 201110185451.3 patent Device, the device use the scheme of both ends temperature control, but are similarly constant positive warm, one end minus temperature in one end to form constant temperature Spend gradient.
(2) water translocation in Rock And Soil in real time, can not be measured accurately.Water translocation measures existing scheme master in Rock And Soil There are three kinds.The first scheme freezes the water content of the front and rear same position soil body, the number that this method obtains using oven drying method measurement Smaller according to measuring, precision is poor, and is only capable of obtaining the moisture distribution for freezing former and later two states.Such as Application No. 201410184471.2 patent discloses a kind of research Thawing soil temperature field, water translocation and deformation rule experimental rig, its The method that measurement water content is dried using temperature measuring point soil sampling, to measure the water translocation in soil sample.Second scheme is in the soil body Diverse location lays moisture transducer, the change of moisture content of point position in frozen-thaw process is measured, although this method can obtain Real time data, but it is limited to number of sensors, the measurement to moisture distribution state is equally rough, precision of this outer sensor itself Be vulnerable to the interference of the factors such as temperature, humidity, in the frozen state or low water content inside soil body test error it is larger.Such as Shen Number it please disclose frozen soil Moisture Transfer Rule simulated test system under the conditions of a kind of indoor snowfall for 201520663814.3 patent System, for the system using the migration for the method monitoring moisture for laying multilayer humidity sensor, concrete scheme is that sensor is in every layer 1m 1m square net is uniformly laid, and 0.5m equidistant laying is pressed between adjacent two layers, it is excessive to there is sensor spacing Problem.The method that the third scheme uses tracer, soil sample is placed in transparent container, coordinates specifically aobvious track hand using camera Section monitors the migration of moisture, although this method can intuitively observe the transition process of moisture, it is bad to there is heat insulation effect The problems such as, and it is only capable of observing the water translocation of specimen surface, as a result without representativeness.Such as Application No. 201510299172.8 Patent disclose moisture transition process follow-up mechanism and its experimental method in a kind of frozen soil, its utilize ultraviolet light under fluorescer exist Freeze the different characteristic of front and rear color, the water containing fluorescer is added in frozen soil sample making course, is afterwards positioned over sample transparent In glass guide channel, monitored in real time using migration of the digital camera to surface moisture.
(3) sensor can produce more serious disturbance to sample structure in itself.Sensor and the wire of connection in itself will Certain space is occupied, because laboratory test sample size is limited, especially for the less sample of size, the presence of sensor The structure of sample will be significantly changed;This outer sensor is generally metal material, and heat conductivility is good, and temperature is easily formed in set-point The exception of field and moisture field is spent, causes the error of test result.
(4) water translocation of the Special Equipment to rock interior in frozen-thaw process there is no to be monitored both at home and abroad.Compared to soil For, rock texture is stable, and porosity is low, and internal water translocation speed is slow, and the required precision to monitoring means is higher.Above The feasibility that the scheme of water translocation is applied in rock in three kinds of monitoring frozen soil of middle introduction is relatively low.Existing monitoring means is difficult High-precision monitoring is realized on the premise of rock overall structure is not destroyed.
The content of the invention
The technical problems to be solved by the invention are to be directed to above-mentioned the deficiencies in the prior art, there is provided a kind of monitoring in real time is frozen The device that Rock And Soil internal moisture migrates during melting.The device is cold by being symmetrical arranged on the inside of the end cap at nuclear-magnetism coil both ends But device, cooler is located at the both ends of Rock And Soil sample, Rock And Soil sample both ends independence temperature control can be achieved, can effectively simulate nature Freezing-thawing;By setting water charging system, constant temperature water source can be provided for the water translocation inside Rock And Soil.By setting water holding device The moisturizing that water surface elevation and sample in water holding device are adjusted during use is held level with both hands together, can eliminate head difference;Insulating box, constant temperature are set The temperature of case is adjustable and synchronous with the holding of moisturizing end, can maintain its temperature and moisturizing end temperature before water enters sample room It is identical, disturbance of the moisturizing to sample interior temperature field can be significantly reduced.Detected in real time in frozen-thaw process using the device of the present invention Different zones moisture Phase velocity map in Rock And Soil, real-time, the accurate survey of unfrozen water content at sample interior arbitrary section can be achieved Measure, Rock And Soil sample structure will not be destroyed in detection process, without burying moisture transducer, be applicable for rock, earth sample.
In order to solve the above technical problems, the technical solution adopted by the present invention is:Ground in a kind of frozen-thaw process of monitoring in real time The device of internal portion's water translocation, it is characterised in that described including NMR system, temperature control system and water charging system NMR system includes nuclear magnetic resonance main frame, the nuclear-magnetism coil being positioned in the detection cabin of nuclear magnetic resonance main frame, the nuclear-magnetism Coil is the cylindrical shape that is open of both ends, and the both ends of nuclear-magnetism coil are provided with detachable end, the nuclear-magnetism coil it is interior Heat-insulation layer is provided with wall, the heat-insulation layer is internally provided with sample room, and the temperature control system includes computer, data Acquisition module, cooler and temperature controller, the quantity of the cooler is two, and two coolers are symmetrically installed in place On the inside of the end cap at nuclear-magnetism coil both ends, it is respectively connected with two coolers for being passed through circulating cooling liquid into cooler High/low temperature bath of liquid groove, connected between cooler and connected high/low temperature bath of liquid groove by silicone tube, the cooler and The temperature sensor for measuring sample indoor temperature, the output end and data of the temperature sensor are mounted on heat-insulation layer The input connection of acquisition module, the data acquisition module and temperature controller connect with computer;The water charging system Including water holding device, insulating box and water conduction hose, the water holding device is arranged in sample room and is in contact with the side of sample, water holding The one end of device away from sample is provided with delivery port, and the water holding device includes water holding device body, and the water holding device body is right by left and right Connect solid cylinder and hollow cylinder composition, the solid cylinder interior edge water holding device body be axially provided with it is multiple with it is empty The capillary channel that heart cylinder is connected, end set of the hollow cylinder away from solid cylinder have a cover plate, it is described go out The mouth of a river is arranged on cover plate, and delivery port, with being connected inside hollow cylinder, the water conduction hose is set in horizontal spiral In in insulating box, and one end of water conduction hose passes insulating box and is connected through end cap and cooler with the delivery port;It is described One end setting of the cooler away from end cap is fluted, and the other end of cooler is provided with coolant feed tube and coolant goes out liquid Pipe.
The device that Rock And Soil internal moisture migrates in above-mentioned real-time monitoring frozen-thaw process, it is characterised in that described solid Cylinder, hollow cylinder and cover plate are integral type structure.
The device that Rock And Soil internal moisture migrates in above-mentioned real-time monitoring frozen-thaw process, it is characterised in that the end cap On offer the through hole passed for coolant feed tube and coolant drain pipe.
The device that Rock And Soil internal moisture migrates in above-mentioned real-time monitoring frozen-thaw process, it is characterised in that the cooling Liquid is fluorination liquid, and the temperature sensor is fibre optic temperature sensor.
The device that Rock And Soil internal moisture migrates in above-mentioned real-time monitoring frozen-thaw process, it is characterised in that the nuclear-magnetism The magnetic field intensity of resonance main frame is 0.3T.
The device that Rock And Soil internal moisture migrates in above-mentioned real-time monitoring frozen-thaw process, it is characterised in that the water guide Scale is provided with flexible pipe.
The device that Rock And Soil internal moisture migrates in above-mentioned real-time monitoring frozen-thaw process, it is characterised in that the insulation Layer is spongy polytetrafluoroethylene (PTFE) heat-insulation layer.
Moved in addition, monitoring Rock And Soil internal moisture in frozen-thaw process in real time using said apparatus present invention also offers one kind The method of shifting, it is characterised in that comprise the following steps:
Step 1: pulling down the cooler and end cap of nuclear-magnetism coil one end, sample levels, which are positioned in sample room, makes sample One end of moisturizing is needed to be located at the side of nuclear-magnetism coil opening, the water holding device of internal water flooding then is placed in into sample needs the one of moisturizing End, makes the solid cylinder end of water holding device be in contact with sample, and the liquid level adjusted in water holding device needs moisturizing with sample One end is highly concordant, then the cooler pulled down and end cap are installed;
Step 2: starting NMR system, temperature control system and computer, rising for sample room is set on computers Beginning test temperature and temperature variation curve, temperature controller is according to the starting test temperature and temperature variation curve of computer settings The temperature of coolant in high/low temperature bath of liquid groove is controlled, the coolant recirculation pump in high/low temperature bath of liquid groove enters in cooler, to sample The temperature of room is controlled, and the real time temperature in the sample room of measurement is fed back to data acquisition module, data by temperature sensor The data of the real time temperature of collection are transferred to computer by acquisition module, and computer enters Mobile state adjustment to the temperature of sample room, The temperature of regulating thermostatic case is identical with one end temperature that sample needs moisturizing;
Step 3: when the temperature in sample room reaches starting test temperature, start to carry out core to the sample in sample room Magnetic resonance detects, and utilizes one-dimensional frequency coded sequence, fluid distrbution information of the detection sample in different aspects;Treat in sample room After the completion of temperature is by the temperature variation curve change of setting, detection is completed.
The present invention has advantages below compared with prior art:
1st, device of the invention is located at cooler by being symmetrical arranged cooler on the inside of the end cap at nuclear-magnetism coil both ends The both ends of Rock And Soil sample, Rock And Soil sample both ends independence temperature control can be achieved, can effectively simulate nature freezing-thawing.
2nd, device of the invention can provide constant temperature water source by setting water charging system for the water translocation inside Rock And Soil. By set water holding device using when adjust water surface elevation in water holding device and the moisturizing of sample is held level with both hands together, head difference can be eliminated; Insulating box is set, and the temperature of insulating box is adjustable and synchronous with the holding of moisturizing end, can tie up its temperature before water enters sample room Hold identical with moisturizing end temperature, disturbance of the moisturizing to sample interior temperature field can be significantly reduced.
3rd, the present invention preferably sets scale on water conduction hose, can monitor rate of water make-up in real time.
4th, method of the invention detects in frozen-thaw process different zones moisture in Rock And Soil in real time using nuclear magnetic resonance technique Phase velocity map, nuclear magnetic resonance technique are extremely sensitive to the hydrogen signal in sample, can be achieved not freeze water at sample interior arbitrary section Real-time, the accurate measurement of content, Rock And Soil sample structure will not be destroyed in detection process, without burying moisture transducer, for Rock, earth sample are applicable.
5th, preferred fluorinated liquid of the present invention, can be real while ensuring that interference will not be produced to nuclear magnetic signal as coolant Real-time, quick, the accurate control (- 25 DEG C of temperature controlling range~30 DEG C, temperature fluctuation ± 0.1 DEG C) of existing sample temperature.
With reference to the accompanying drawings and examples, technical scheme is described in further detail.
Brief description of the drawings
Fig. 1 is the structural representation of apparatus of the present invention.
Fig. 2 is the dimensional structure diagram of water holding device of the present invention.
Fig. 3 is the three-dimensional cutaway view of water holding device of the present invention.
Fig. 4 is the dimensional structure diagram of cooler of the present invention.
Fig. 5 is the schematic block circuit diagram of apparatus of the present invention.
Fig. 6 is one-dimensional frequency coded sequence schematic diagram.
Fig. 7 is that the relation tested using one-dimensional frequency coded sequence between obtained hierarchical signal amount and Plane Location is bent Line.
Description of reference numerals:
1-nuclear magnetic resonance main frame;2-sample room;3-silicone tube;
4-end cap;5-high/low temperature bath of liquid groove;6-temperature sensor;
7-cooler;8-nuclear-magnetism coil;9-heat-insulation layer;
10-sample;11-water holding device;11-1-solid cylinder;
11-2-hollow cylinder;11-3-capillary channel;11-4-cover plate;
12-insulating box;13-water conduction hose;14-coolant feed tube;
15-coolant drain pipe;16-groove;17-delivery port;
18-data acquisition module;19-temperature controller;20-computer;
21-resistive heater.
Embodiment
As shown in Figure 1, Figure 2 and Figure 3, the dress that Rock And Soil internal moisture migrates in real-time monitoring frozen-thaw process of the invention Put, including NMR system, temperature control system and water charging system, the NMR system include nuclear magnetic resonance main frame 1, The nuclear-magnetism coil 8 being positioned in the detection cabin of nuclear magnetic resonance main frame 1, the cylindrical shape that the nuclear-magnetism coil 8 is open for both ends, core The both ends of magnetic coil 8 are provided with detachable end 4, and heat-insulation layer 9, the guarantor are provided with the inwall of the nuclear-magnetism coil 8 Warm layer 9 is internally provided with sample room 2, and the temperature control system includes computer 20, data acquisition module 18, cooler 7 With temperature controller 19, the quantity of the cooler 7 is two, and two coolers 7 are symmetrically mounted on positioned at nuclear-magnetism coil 8 On the inside of the end cap 4 at both ends, the height for being passed through circulating cooling liquid into cooler 7 is respectively connected with two coolers 7 Warm bath of liquid groove 5, connected between cooler 7 and connected high/low temperature bath of liquid groove 5 by silicone tube 3, the cooler 7 and guarantor The temperature sensor 6 for measuring temperature in sample room 2, the output end and number of the temperature sensor 6 are mounted on warm layer 9 Connected according to the input of acquisition module 18, the data acquisition module 18 and temperature controller 19 connect with computer 20;Institute Stating water charging system includes water holding device 11, insulating box 12 and water conduction hose 13, and the water holding device 11 is arranged in sample room 2 and and sample The side of product 10 is in contact, and the one end of water holding device 11 away from sample 10 is provided with delivery port 17, and the water holding device 11 includes water holding Device body, the solid cylinder 11-1 and hollow cylinder 11-2 that the water holding device body is docked by left and right are formed, described solid Cylinder 11-1 interior edge water holding device bodies are axially provided with multiple capillary channel 11-3 being connected with hollow cylinder 11-2, institute Stating end sets of the hollow cylinder 11-2 away from solid cylinder 11-1 has cover plate 11-4, and the delivery port 17 is arranged at cover plate On 11-4, and delivery port 17, with being connected inside hollow cylinder 11-2, the water conduction hose 13 is arranged in horizontal spiral In insulating box 12, and one end of water conduction hose 13 passes insulating box 12 and connected through end cap 4 and cooler 7 with the delivery port 17 Connect.
In the present embodiment, the solid cylinder 11-1, hollow cylinder 11-2 and cover plate 11-4 are integral type structure.
As shown in figure 4, in the present embodiment, the one end of the cooler 7 away from end cap 4 sets fluted 16, cooler 7 The other end is provided with coolant feed tube 14 and coolant drain pipe 15.
In the present embodiment, offer on the end cap 4 and lead to for what coolant feed tube 14 and coolant drain pipe 15 passed Hole.
In the present embodiment, the coolant is fluorination liquid, and the temperature sensor 6 is fibre optic temperature sensor.
In the present embodiment, the magnetic field intensity of the nuclear magnetic resonance main frame 1 is 0.3T.
In the present embodiment, scale is provided with the water conduction hose 13.
In the present embodiment, the heat-insulation layer 9 is spongy polytetrafluoroethylene (PTFE) heat-insulation layer.
In the present embodiment, the liquid outlet of the high/low temperature bath of liquid groove is provided with resistive heater 21, and temperature controller 19 is controlled Resistive heater 21 processed heats to coolant, and controls the temperature of insulating box 12 and sample to need one end temperature phase of moisturizing Together.
Using the device of the present invention monitor in real time the method that Rock And Soil internal moisture in frozen-thaw process migrates specifically include with Lower step:
Step 1: pulling down the cooler 7 and end cap 4 of the one end of nuclear-magnetism coil 8, sample 10 is placed horizontally in sample room 2 Make sample 10 need one end of moisturizing to be located at the side of the opening of nuclear-magnetism coil 8, the water holding device 11 of internal water flooding is then placed in sample 10 need one end of moisturizing, the solid cylinder 11-1 ends of water holding device 11 is in contact with sample 10, in adjustment water holding device 11 One end that liquid level needs moisturizing with sample 10 is highly concordant, then the cooler 7 pulled down and end cap 4 are installed;
Step 2: starting NMR system, temperature control system and computer 20, sample room is set on the computer 20 2 starting test temperature and temperature variation curve, the starting test temperature and temperature that temperature controller 19 is set according to computer 20 Spend the temperature of coolant in change curve control high/low temperature bath of liquid groove 5, the coolant recirculation pump in high/low temperature bath of liquid groove 5 enters cooling In device 7, the temperature of sample room 2 is controlled, the real time temperature in the sample room 2 of measurement is fed back to number by temperature sensor 6 According to acquisition module 18, the data of the real time temperature of collection are transferred to computer 20 by data acquisition module 18, and computer 20 is to sample The temperature of product room 2 enters Mobile state adjustment, and the temperature of regulating thermostatic case 12 is identical with one end temperature that sample 10 needs moisturizing;
Step 3: when the temperature in sample room 2 reaches starting test temperature, start to enter the sample 10 in sample room 2 Row magnetic resonance detection, utilize one-dimensional frequency coded sequence, fluid distrbution information of the detection sample 10 in different aspects;Treat sample After the completion of temperature in room 2 is changed by the temperature variation curve of setting, detection is completed.
The general principle and example that Rock And Soil internal moisture migrates in the frozen-thaw process of monitoring in real time of the invention are as follows:
When monitoring Rock And Soil internal moisture migration in frozen-thaw process in real time using the device of the present invention, using conventional T2 relaxation Analysis method, can obtain the overall relaxation information of sample, but can not differentiate sample in diverse location (such as different aspects) content and The difference of saturation degree.So when needing fluid distrbution information of the study sample in different aspects, one-dimensional frequency code sequence is utilized Arrange (such as Fig. 6), after 90 ° of radio-frequency pulses are applied, apply linear magnetic field gradient on gradient direction is read, it is after-applied in the TE/2 times 180 ° of pulses, echo-signal is gathered after the TE times.Due to the application of linear magnetic field gradient, allow in the echo-signal collected and contain Different frequency domain informations, and different frequencies corresponds to locus different on gradient direction, and the echo-signal of collection is carried out One dimensional fourier transform, the signal intensity of sample different aspects can be obtained by simply converting.
Using above-mentioned one-dimensional frequency coded sequence, after study of rocks sample (height of specimen 15mm) one end absorbs water 2.5 hours, The signal intensity of different aspects.Sample one-dimensional frequency coded sequence signal is gathered before water suction, water suction gathers again after 2.5 hours The one-dimensional frequency coded sequence signal of sample;Echo-signal is obtained after Fourier transform hierarchical signal amount and resonant frequency it Between relation curve;Frequency finally is converted into positional information, and can to obtain relation between hierarchical signal amount and Plane Location bent Line (such as Fig. 7), left side absorbs water the signal intensity of one end for sample in figure, and right side is that sample does not absorb water the signal intensity of one end.
It is described above, only it is presently preferred embodiments of the present invention, any restrictions is not done to the present invention, it is every according to invention skill Any simple modification, change and the equivalent structure change that art is substantially made to above example, still fall within the technology of the present invention In the protection domain of scheme.

Claims (8)

1. the device that Rock And Soil internal moisture migrates in a kind of frozen-thaw process of monitoring in real time, it is characterised in that including nuclear magnetic resonance System, temperature control system and water charging system, the NMR system include nuclear magnetic resonance main frame (1), are positioned over nuclear-magnetism and are total to The nuclear-magnetism coil (8) to shake in the detection cabin of main frame (1), the cylindrical shape that the nuclear-magnetism coil (8) is open for both ends, nuclear-magnetism coil (8) both ends are provided with detachable end (4), and heat-insulation layer (9) is provided with the inwall of the nuclear-magnetism coil (8), described Heat-insulation layer (9) is internally provided with sample room (2), and the temperature control system includes computer (20), data acquisition module (18), cooler (7) and temperature controller (19), the quantity of the cooler (7) is two, and two coolers (7) are right Claim to be mounted on the inside of the end cap (4) at nuclear-magnetism coil (8) both ends, be respectively connected with and be used for cold on two coolers (7) But the high/low temperature bath of liquid groove (5) of circulating cooling liquid, cooler (7) and connected high/low temperature bath of liquid groove (5) are passed through in device (7) Between connected by silicone tube (3), be mounted on the cooler (7) and heat-insulation layer (9) being used to measure temperature in sample room (2) The temperature sensor (6) of degree, the output end of the temperature sensor (6) are connected with the input of data acquisition module (18), institute State data acquisition module (18) and temperature controller (19) connects with computer (20);The water charging system includes water holding device (11), insulating box (12) and water conduction hose (13), the water holding device (11) are arranged in sample room (2) and with the one of sample (10) Side is in contact, and the one end of water holding device (11) away from sample (10) is provided with delivery port (17), and the water holding device (11) includes water holding Device body, the solid cylinder (11-1) and hollow cylinder (11-2) that the water holding device body is docked by left and right form, described Solid cylinder (11-1) interior edge water holding device body is axially provided with multiple capillarys being connected with hollow cylinder (11-2) and led to Road (11-3), end set of the hollow cylinder (11-2) away from solid cylinder (11-1) has cover plate (11-4), described Delivery port (17) is arranged on cover plate (11-4), and delivery port (17) inside hollow cylinder (11-2) with being connected, described to lead Water tube hose (13) is arranged in insulating box (12) in horizontal spiral, and one end of water conduction hose (13) passes insulating box (12) simultaneously It is connected through end cap (4) and cooler (7) with the delivery port (17);The one end of the cooler (7) away from end cap (4) is set Fluted (16), the other end of cooler (7) are provided with coolant feed tube (14) and coolant drain pipe (15).
2. the device migrated according to Rock And Soil internal moisture in the real-time monitoring frozen-thaw process described in claim 1, its feature exist In the solid cylinder (11-1), hollow cylinder (11-2) and cover plate (11-4) are integral type structure.
3. the device migrated according to Rock And Soil internal moisture in the real-time monitoring frozen-thaw process described in claim 1, its feature exist In offering the through hole passed for coolant feed tube (14) and coolant drain pipe (15) on the end cap (4).
4. the device migrated according to Rock And Soil internal moisture in the real-time monitoring frozen-thaw process described in claim 1, its feature exist In the coolant is fluorination liquid, and the temperature sensor (6) is fibre optic temperature sensor.
5. the device migrated according to Rock And Soil internal moisture in the real-time monitoring frozen-thaw process described in claim 1, its feature exist In the magnetic field intensity of the nuclear magnetic resonance main frame (1) is 0.3T.
6. the device migrated according to Rock And Soil internal moisture in the real-time monitoring frozen-thaw process described in claim 1, its feature exist In being provided with scale on the water conduction hose (13).
7. the device migrated according to Rock And Soil internal moisture in the real-time monitoring frozen-thaw process described in claim 1, its feature exist In the heat-insulation layer (9) is spongy polytetrafluoroethylene (PTFE) heat-insulation layer.
8. a kind of monitor the method that Rock And Soil internal moisture migrates in frozen-thaw process using device as claimed in claim 1 in real time, It is characterised in that it includes following steps:
Step 1: pulling down the cooler (7) and end cap (4) of nuclear-magnetism coil (8) one end, sample (10) is placed horizontally at sample room (2) sample (10) is made to need one end of moisturizing to be located at the open side of nuclear-magnetism coil (8) in, then by the water holding device of internal water flooding (11) being placed in sample (10) needs one end of moisturizing, solid cylinder (11-1) end of water holding device (11) is connected with sample (10) Touch, the liquid level in adjustment water holding device (11) needs one end of moisturizing cooler that is highly concordant, then will pulling down with sample (10) (7) installed with end cap (4);
Step 2: starting NMR system, temperature control system and computer (20), sample room is set on computer (20) (2) temperature is tested in starting test temperature and temperature variation curve, the starting that temperature controller (19) is set according to computer (20) The temperature of degree and temperature variation curve control high/low temperature bath of liquid groove (5) interior coolant, the coolant in high/low temperature bath of liquid groove (5) are followed Ring is pumped into cooler (7), and the temperature of sample room (2) is controlled, and temperature sensor (6) is by the sample room (2) of measurement Real time temperature feed back to data acquisition module (18), the data of the real time temperature of collection are transferred to by data acquisition module (18) Computer (20), computer (20) enter Mobile state adjustment, the temperature and sample of regulating thermostatic case (12) to the temperature of sample room (2) (10) need one end temperature of moisturizing identical;
Step 3: when the temperature in sample room (2) reaches starting test temperature, start to the sample (10) in sample room (2) Magnetic resonance detection is carried out, utilizes one-dimensional frequency coded sequence, fluid distrbution information of the detection sample (10) in different aspects;Treat After the completion of temperature in sample room (2) is changed by the temperature variation curve of setting, detection is completed.
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CN108107068B (en) * 2017-12-11 2020-07-28 内蒙古工业大学 Method for testing freezing rate of lightweight aggregate concrete pores under freeze-thaw cycle
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CN109839403B (en) * 2019-03-22 2022-01-14 大连理工大学 Phase transition process temperature measurement system based on nuclear magnetic resonance
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CN111795990B (en) * 2020-01-09 2021-12-21 中国矿业大学(北京) Method for determining water migration process in rock and soil mass based on nuclear magnetic resonance technology
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