CN110333269B - Nondestructive measuring device and method for frozen soil moisture migration rule - Google Patents
Nondestructive measuring device and method for frozen soil moisture migration rule Download PDFInfo
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Abstract
The invention discloses a measuring device for the migration rule of unfrozen water of frozen soil, which comprises a container with openings at two ends, a controller, a plurality of electrode patches, a plurality of electrode connecting wires, a low-temperature circulator, an upper computer, an external measuring device and a water injection module, wherein the upper computer is connected with the controller; the low-temperature circulator is arranged at two ends of the container with openings at two ends and is used for controlling the temperature of the frozen soil sample placed in the container; the controller controls the electrode patch to work and obtains an electric signal for measurement; the electrode patch acquires an input power signal or outputs an electric signal for measurement; the water injection module is connected with a water injection port of the low-temperature circulator and injects water into the container; the external measuring device supplies power to the controller, provides an input power signal and obtains an electric signal for measurement through the controller; the upper computer controls the electrode patch and the low-temperature circulator to work. The invention also discloses a measuring method of the measuring device for the migration rule of the unfrozen water of the frozen soil. The invention realizes the measurement of the unfrozen water of the frozen soil, and has the advantages of simplicity, reliability and convenient use.
Description
Technical Field
The invention particularly relates to a nondestructive measuring device and a measuring method for a frozen soil moisture migration rule.
Background
Frozen earth is defined as a body of rock that contains ice crystals below 0 ℃. According to the freezing time, the method can be divided into: permafrost (also called permafrost, which refers to a soil layer that is not frozen for two or more years), seasonal frozen soil (half a month to several months), and short-term frozen soil (hours/days to half a month). The perennial frozen soil in China occupies more than 1/5 of the national soil area, is the third frozen soil country in the world second to Russia and Canada, is mainly distributed in high latitude and high altitude areas such as northeast, inner Mongolia and Xinjiang Tibet, and often forms climate with high cold and high heat, and most of the frozen soil in China belongs to seasonal frozen soil due to the influence of the climate.
However, the biggest challenge in the construction of high-speed railways and airports in cold regions is how to deal with the problem of "frost heaving" of the roadbed. The frost heaving refers to a phenomenon that water in a roadbed is in a negative temperature state below zero, and is condensed into ice to cause volume expansion and roadbed pavement swelling, and the damage to the engineering quality is particularly serious. The two high-speed rails in cold regions, the Hadamard high-speed rail and the Lanxin high-speed rail which are built in China at present have the problem of frost heaving in different degrees. The average frost heaving of the whole line of the Hadamard line is 5mm, and the maximum frost heaving can reach 20mm, so that the operation safety is seriously influenced. The frost heaving problem becomes the primary consideration in engineering construction in cold regions, and particularly, the frost heaving problem is an important project such as high-speed railways and airports which have extremely high requirements on road smoothness. The nature of frost heaving is the problem of water migration, taking the harda line as an example, because the roadbed earth surface temperature in a cold region is as low as-30 ℃, the water migration in the existing frozen soil at the temperature of about 10 ℃ in roadbed soil generally refers to the migration of liquid water, and the unfrozen water generally refers to the liquid water in the freezing process, the research on the water migration refers to the research on the content and the change of the unfrozen water, the content of the unfrozen water can change along with the change of the temperature, and the phase change of the water can influence the hydraulic, thermal and physical properties of the frozen soil, so the measurement of the unfrozen water is very important.
At present, common methods for measuring moisture migration in the unsaturated soil freezing process are indoor experimental methods, and devices for measuring moisture migration in the unsaturated soil freezing process developed domestically generally directly adopt a layered drying method or a TDR (time domain reflectometry) similar method and the like. However, although such methods have a certain range of applicability, they still have the following limitations.
1. The layered drying method can only know the total amount of water migration of the soil body in the whole process, but cannot reflect the rule of water migration in the process, and has longer required time and large workload;
2. TDR is similar to the method, although the operation of the method is simple and the time is short, the integrity of the soil body can be damaged by the method of inserting the probe into the soil, and the TDR method is low in accuracy of water migration, has more influence factors on the experiment and is unstable.
Disclosure of Invention
The invention aims to provide a nondestructive measuring device for frozen soil moisture migration law, which is high in reliability, simple and convenient.
The second object of the present invention is to provide a measuring method of the nondestructive measuring apparatus for frozen soil moisture migration law.
The invention provides a nondestructive measuring device for the frozen soil moisture migration rule, which comprises a container with two open ends, a controller, a plurality of electrode patches, a plurality of electrode connecting wires, a low-temperature circulator, an upper computer, an external measuring device and a water injection module; the low-temperature circulator comprises a first low-temperature circulating plate and a second low-temperature circulating plate which are connected with each other, the first low-temperature circulating plate is installed at one end of the container with the two open ends, the second low-temperature circulating plate is installed at the other end of the container with the two open ends, and the low-temperature circulator is used for controlling the temperature of the frozen soil sample placed in the container; one end of the controller is connected with the electrode connecting wire and is connected with the electrode patch through the electrode connecting wire; the other end of the controller is directly connected with an external measuring device; the controller is used for controlling the work of the electrode patch and acquiring an electric signal which is output by the electrode patch and used for measurement; the electrode patch is arranged on the inner wall of the container, is connected with an external measuring device through an electrode connecting wire and a controller in sequence, and is used for acquiring an input power signal or outputting an electric signal for measurement; the water injection module is connected with a water injection port of the low-temperature circulator and is used for injecting water into the container; the external measuring device is used for supplying power to the controller, providing an input power supply signal and acquiring an electric signal which is output by the electrode patch and is used for measurement through the controller; the upper computer is connected with the controller and is used for controlling the work of the electrode patch through the controller and controlling the temperature of the low-temperature circulator.
The container with two open ends is a round organic glass cylinder with two open ends.
The water injection module comprises a Marterrio bottle and a water injection rubber pipe; the Marterio bottle is connected with a water filling port of the low-temperature circulator through a water filling rubber tube and is used for filling water into the container.
The electrode patches are arranged on the inner wall of the container, specifically, the container is divided into a plurality of layers, a plurality of electrode patches are arranged on every other layer, and the electrode patches are connected with an external measuring device through an electrode connecting wire and a controller and used for acquiring input power signals or outputting electric signals for measurement; the electrode patch is used to measure the resistivity of the layer on which it is placed by van der Pauw method.
The electrode patches are arranged on the inner wall of the container, specifically, the container is divided into 20 layers, 4 electrode patches are arranged on every two layers, a connecting line of the first electrode patch and the third electrode patch passes through the circle center of the layer where the connecting line of the second electrode patch and the fourth electrode patch passes through, and the distance between the first electrode patch and the second electrode patch is equal to the distance between the third electrode patch and the fourth electrode patch.
The electrode patch is a thin copper electrode patch.
The electrode patch is arranged on the inner wall of the container, and specifically, the electrode patch is adhered to the inner wall of the container through glue.
The invention also provides a measuring method of the nondestructive measuring device for the frozen soil moisture migration rule, which comprises the following steps:
s1, only filling a layer of soil sample with known water content in a measuring device, and not starting a low-temperature circulator and a water injection module;
s2, measuring and obtaining the resistivity of the single-layer soil sample by adopting a Van der Pauw method;
s3, filling the soil sample with the same water content as the soil sample in the step S1 in the testing device, and not starting the low-temperature circulator and the water injection module;
s4, measuring and obtaining the resistivity of the soil sample of the layer where the electrode patch is located by adopting a Van der Pauw method;
s5, calculating a correction coefficient of the layer where each electrode patch is located according to the resistivity of the single-layer soil sample obtained in the step S2 and the resistivity of the soil sample of the layer where the electrode patch is located obtained in the step S4;
s6, filling the soil sample with the same water content as that in the step S1 in the testing device, setting the temperature of the low-temperature circulator and the water injection quantity of the water injection module, and starting the low-temperature circulator and the water injection module to obtain a frozen soil sample;
s7, measuring and obtaining the resistivity of the frozen soil test sample of the layer where the electrode patch is located by adopting a Van der Pauw method;
s8, according to the correction coefficient of the layer where each electrode patch is located, which is obtained in the step S5, correcting the resistivity of the test frozen soil sample of the layer where the electrode patch is located, which is obtained in the step S7, so that the real resistivity of the frozen soil sample of the layer where the electrode patch is located is obtained;
s9, according to the resistivity of the real frozen soil sample of the layer where the electrode patch is located, obtained in the step S8, calculating the unfrozen water content of the frozen soil sample of the layer where the electrode patch is located;
s10, repeating the steps S7-S9 according to the set measuring time point, so as to obtain a curve of the change of the unfrozen water content of the frozen soil sample of the layer where the electrode patch is located along with the time;
and S11, analyzing the migration rule of the unfrozen water of the frozen soil according to the curve of the unfrozen water content of the frozen soil sample of the layer where the electrode patch is located, which is obtained in the step S10, along with the change of time.
Measuring the resistivity by adopting a Van der Pauw method, specifically, measuring the resistivity by adopting the following steps:
a. aiming at four electrode patches connected with the frozen soil sample, constant current I is injected between a first electrode patch and a second electrode patchA1-A2And measuring a voltage V between the third electrode patch and the fourth electrode patchA3-A4Thereby obtaining a first resistance value
b. Aiming at four electrode patches connected with the frozen soil sample, constant current I is injected between the second electrode patch and the third electrode patchA2-A3And measuring a voltage V between the fourth electrode patch and the first electrode patchA4-A1Thereby obtaining a second resistance value
c. The resistivity ρ is calculated using the following formula:
in the formula R1Is a first resistance value, R2D is the diameter of the container.
Step S5, calculating the correction coefficient of the layer where each electrode patch is located, specifically, calculating the correction coefficient of the layer where each electrode patch is located by using the following formula:
in the formula ofiIs the correction coefficient r of the layer where the ith layer of motor patch is locatediThe resistivity of the soil sample of the layer where the ith layer of electrode patch is located is shown, and r is the resistivity of the soil sample of a single layer.
And S8, correcting the resistivity of the test frozen soil sample of the layer where the electrode patches are located obtained in the step S7 according to the correction coefficient of the layer where the electrode patches are located obtained in the step S5, specifically, multiplying the correction coefficient of the layer where the electrode patches are located obtained in the step S5 by the resistivity of the test frozen soil sample of the layer where the electrode patches are located obtained in the step S7, and thus obtaining the real resistivity of the frozen soil sample of the layer where the electrode patches are located.
Step S9, calculating the unfrozen water content of the frozen soil sample on the layer where the electrode patch is located, specifically, calculating the unfrozen water content of the frozen soil sample on the layer where the electrode patch is located by using the following formula:
where ρ is the resistivity of the frozen soil sample of the layer where the electrode patch is located, θvThe unfrozen water content of the frozen soil sample of the layer on which the electrode patch is located.
According to the nondestructive measuring device and the measuring method for the water migration rule of the frozen soil, the measurement of the unfrozen water of the frozen soil is realized through the designed measuring device and measuring method, so that basic data and measuring data are provided for the analysis of the migration rule of the unfrozen water of the frozen soil; the method is simple and reliable, and is convenient to use.
Drawings
FIG. 1 is a schematic view of a measuring device of the present invention.
Fig. 2 is a schematic diagram of the arrangement of the single-layer electrode patch of the present invention and a schematic diagram of van der waals method.
FIG. 3 is a schematic flow chart of the method of the present invention.
Detailed Description
FIG. 1 shows a schematic view of a measuring device according to the present invention: the invention provides a nondestructive measuring device for the frozen soil moisture migration rule, which comprises a container with two open ends, a controller, a plurality of electrode patches, a plurality of electrode connecting wires, a low-temperature circulator, an upper computer, an external measuring device and a water injection module; the low-temperature circulator comprises a first low-temperature circulating plate and a second low-temperature circulating plate which are connected with each other, the first low-temperature circulating plate is installed at one end of the container with the two open ends, the second low-temperature circulating plate is installed at the other end of the container with the two open ends, and the low-temperature circulator is used for controlling the temperature of the frozen soil sample placed in the container; one end of the controller is connected with the electrode connecting wire and is connected with the electrode patch through the electrode connecting wire; the other end of the controller is directly connected with an external measuring device; the controller is used for controlling the work of the electrode patch and acquiring an electric signal which is output by the electrode patch and used for measurement; the electrode patch is arranged on the inner wall of the container, is connected with an external measuring device through an electrode connecting wire and a controller in sequence, and is used for acquiring an input power signal or outputting an electric signal for measurement; the water injection module is connected with a water injection port of the low-temperature circulator and is used for injecting water into the container; the external measuring device is used for supplying power to the controller, providing an input power supply signal and acquiring an electric signal which is output by the electrode patch and is used for measurement through the controller; the upper computer is connected with the controller and is used for controlling the work of the electrode patch through the controller and controlling the temperature of the low-temperature circulator.
In specific implementation, the measuring device for the migration law of the unfrozen water of the frozen soil comprises a container 7 with openings at two ends, a controller 8 (a PLC can be adopted in specific implementation), an external measuring device 9, an upper computer 10 (a computer can be adopted in specific implementation), a plurality of electrode patches 5, a plurality of electrode connecting wires 6, a low-temperature circulator 4 and water injection modules (1 and 2); the low-temperature circulator comprises a first low-temperature circulating plate and a second low-temperature circulating plate which are connected with each other, the first low-temperature circulating plate is installed at one end of the container with the two open ends, the second low-temperature circulating plate is installed at the other end of the container with the two open ends, and the low-temperature circulator is used for controlling the temperature of the frozen soil sample placed in the container; the logic controller (PLC) is a programmable logic controller, can realize the combination measurement between any two electrodes through a special system, the electrode patch is arranged on the inner wall of the container, and is connected with an external measuring device through an electrode connecting wire and the logic controller (PLC) for acquiring an input power signal or outputting an electric signal for measurement; the water injection module is connected with a water injection port of the low-temperature circulator and is used for injecting water into the container; in the figure, 3 is an air pressure balancing tube for balancing the air pressure in the sample tube, so that the water in the mahalanobis bottle can flow into the water tank.
In specific implementation, the container with two open ends is a circular organic glass cylinder with two open ends; the water injection module comprises a Marterrio bottle 1 and a water injection rubber tube 2; the Martelia bottle is connected with a water injection port of the low-temperature circulator through a water injection rubber tube and is used for injecting water into the container by adopting the principle of a communicating vessel (the purpose and the function of water injection are that water is injected into a water tank of the sample cylinder, the water in the water tank can be supplemented in real time, and the water level of the water tank is kept unchanged, so that frozen soil samples are conveniently manufactured; the electrode patch is a thin copper electrode patch and is adhered to the inner wall of the container through glue; when the sample frozen soil is filled, the conductive adhesive is arranged on the side of the electrode patch contacting the sample, so that the electrical connectivity between the electrode patch and the sample frozen soil is increased, and the resistance of a contact surface is reduced;
the electrode patches are arranged on the inner wall of the container, specifically, the container is divided into a plurality of layers, a plurality of electrode patches are arranged on every other layer, and the electrode patches are connected with external measurement through electrode connecting wires and a logic controller (PLC) and used for acquiring input power signals or outputting electric signals for measurement; the electrode patch is used for measuring the resistivity of the layer by a Van der Pauw method; for example, as shown in fig. 1 and fig. 2, the electrode patches are mounted on the inner wall of the container, the container is divided into 20 layers, 4 electrode patches are mounted on every other layer (as shown in fig. 2, the electrode patch mounting diagram of a certain layer is shown), the connecting line between the first electrode patch a1 and the third electrode patch A3 passes through the center of the layer, the connecting line between the second electrode patch a2 and the fourth electrode patch a4 passes through the center of the layer, and the distance between the first electrode patch and the second electrode patch is equal to the distance between the third electrode patch and the fourth electrode patch;
the external measuring device comprises a power supply module, a voltage measuring module and a current measuring module; the power supply module is used for supplying power to the electrode plate of the device; the voltage measuring module is used for measuring voltage signals of the electrode patches; the current measuring module is used for measuring a current signal of the motor patch. A logic controller (PLC) is specially designed for industrial production, and is a digital operation electronic device, which adopts a programmable memory for storing program therein, executing logic operation and sequential control. Before the experiment, the electrode wires of the measuring module and an external measuring device are respectively connected to two ends of a logic controller (PLC), and then program control is executed on the logic controller through an upper computer (computer), so that circuits at two ends of the logic controller can be automatically communicated according to the set program, power is supplied to the device, and voltage signals and current signals between corresponding electrode plates of the device are measured.
Fig. 3 is a schematic flow chart of a measuring method of the measuring apparatus of the present invention: the measuring method of the measuring device for the migration law of unfrozen water of the frozen soil comprises the following steps:
s1, only filling a layer of soil sample with known water content in a measuring device, and not starting a low-temperature circulator and a water injection module;
s2, measuring and obtaining the resistivity of the single-layer soil sample by adopting a Van der Pauw method;
s3, filling the soil sample with the same water content as the soil sample in the step S1 in the testing device, and not starting the low-temperature circulator and the water injection module;
s4, measuring and obtaining the resistivity of the soil sample of the layer where the electrode patch is located by adopting a Van der Pauw method;
s5, calculating a correction coefficient of the layer where each electrode patch is located according to the resistivity of the single-layer soil sample obtained in the step S2 and the resistivity of the soil sample of the layer where the electrode patch is located obtained in the step S4; specifically, the correction coefficient of the layer where each electrode patch is located is calculated by adopting the following formula:
in the formula ofiIs the correction coefficient r of the layer where the ith layer of motor patch is locatediThe resistivity of a soil sample on the layer where the ith layer of electrode patch is located is shown, and r is the resistivity of a single-layer soil sample;
s6, filling the soil sample with the same water content as that in the step S1 in the testing device, setting the temperature of the low-temperature circulator and the water injection quantity of the water injection module, and starting the low-temperature circulator and the water injection module to obtain a frozen soil sample;
s7, measuring and obtaining the resistivity of the frozen soil test sample of the layer where the electrode patch is located by adopting a Van der Pauw method;
s8, according to the correction coefficient of the layer where each electrode patch is located, which is obtained in the step S5, correcting the resistivity of the test frozen soil sample of the layer where the electrode patch is located, which is obtained in the step S7, so that the real resistivity of the frozen soil sample of the layer where the electrode patch is located is obtained; multiplying the correction coefficient of the layer where each electrode patch is located obtained in the step S5 by the resistivity of the test frozen soil sample of the layer where the electrode patch is located obtained in the step S7, so as to obtain the real resistivity of the frozen soil sample of the layer where the electrode patch is located;
s9, according to the resistivity of the real frozen soil sample of the layer where the electrode patch is located, obtained in the step S8, calculating the unfrozen water content of the frozen soil sample of the layer where the electrode patch is located; specifically, the unfrozen water content of the frozen soil sample of the layer where the electrode patch is located is calculated by adopting the following formula:
where ρ is the resistivity of the frozen soil sample of the layer where the electrode patch is located, θvThe content of unfrozen water of the frozen soil sample of the layer where the electrode patch is located;
s10, repeating the steps S7-S9 according to the set measuring time point, so as to obtain a curve of the change of the unfrozen water content of the frozen soil sample of the layer where the electrode patch is located along with the time;
and S11, analyzing the migration rule of the unfrozen water of the frozen soil according to the curve of the unfrozen water content of the frozen soil sample of the layer where the electrode patch is located, which is obtained in the step S10, along with the change of time.
In the process of the steps, the resistivity is measured by adopting a van der Waals method, and specifically, the resistivity is measured by adopting the following steps:
a. aiming at four electrode patches connected with the frozen soil sample, constant current I is injected between a first electrode patch and a second electrode patchA1-A2And measuring a voltage V between the third electrode patch and the fourth electrode patchA3-A4Thereby obtaining a first resistance value
b. Aiming at four electrode patches connected with the frozen soil sample, constant current I is injected between the second electrode patch and the third electrode patchA2-A3And measuring a voltage V between the fourth electrode patch and the first electrode patchA4-A1Thereby obtaining a second resistance value
c. The resistivity ρ is calculated using the following formula:
in the formula R1Is a first resistance value, R2D is the diameter of the container.
Claims (3)
1. A measuring method of a nondestructive measuring device for the water migration rule of frozen soil is characterized by comprising the following steps:
s1, only filling a layer of soil sample with known water content in a measuring device, and not starting a low-temperature circulator and a water injection module;
s2, measuring and obtaining the resistivity of the single-layer soil sample by adopting a Van der Pauw method;
s3, filling the soil sample with the same water content as the soil sample in the step S1 in the testing device, and not starting the low-temperature circulator and the water injection module;
s4, measuring and obtaining the resistivity of the soil sample of the layer where the electrode patch is located by adopting a Van der Pauw method; specifically, the following steps are adopted to measure the resistivity:
a. injecting constant current I between a first electrode patch and a second electrode patch aiming at four electrode patches connected with a soil sampleA1-A2And measuring a voltage V between the third electrode patch and the fourth electrode patchA3-A4Thereby obtaining a first resistance value
b. Injecting constant current I between the second electrode patch and the third electrode patch aiming at four electrode patches connected with the soil sampleA2-A3And measuring a voltage V between the fourth electrode patch and the first electrode patchA4-A1Thereby obtaining a second resistance value
c. The resistivity ρ is calculated using the following formula:
in the formula R1Is a first resistance value, R2Is a second resistance value, d is the diameter of the container;
s5, calculating a correction coefficient of the layer where each electrode patch is located according to the resistivity of the single-layer soil sample obtained in the step S2 and the resistivity of the soil sample of the layer where the electrode patch is located obtained in the step S4; specifically, the correction coefficient of the layer where each electrode patch is located is calculated by adopting the following formula:
in the formula ofiIs the correction coefficient of the layer where the ith layer of electrode patch is located, rhoiThe resistivity of a soil sample on the layer where the ith layer of electrode patch is located is shown, and rho is the resistivity of a single-layer soil sample;
s6, filling the soil sample with the same water content as that in the step S1 in the testing device, setting the temperature of the low-temperature circulator and the water injection quantity of the water injection module, and starting the low-temperature circulator and the water injection module to obtain a frozen soil sample;
s7, measuring and obtaining the resistivity of the frozen soil test sample of the layer where the electrode patch is located by adopting a Van der Pauw method;
s8, according to the correction coefficient of the layer where each electrode patch is located, which is obtained in the step S5, correcting the resistivity of the test frozen soil sample of the layer where the electrode patch is located, which is obtained in the step S7, so that the real resistivity of the frozen soil sample of the layer where the electrode patch is located is obtained; multiplying the correction coefficient of the layer where each electrode patch is located obtained in the step S5 by the resistivity of the test frozen soil sample of the layer where the electrode patch is located obtained in the step S7, so as to obtain the real resistivity of the frozen soil sample of the layer where the electrode patch is located;
s9, according to the resistivity of the real frozen soil sample of the layer where the electrode patch is located, obtained in the step S8, calculating the unfrozen water content of the frozen soil sample of the layer where the electrode patch is located; specifically, the unfrozen water content of the frozen soil sample of the layer where the electrode patch is located is calculated by adopting the following formula:
where rhorIs the true frozen soil sample resistivity, theta, of the layer in which the electrode patch is locatedvThe unfrozen water content of the frozen soil sample of the layer where the electrode patch is located;
s10, repeating the steps S7-S9 according to the set measuring time point, so as to obtain a curve of the change of the unfrozen water content of the frozen soil sample of the layer where the electrode patch is located along with the time;
s11, analyzing the migration rule of the unfrozen water of the frozen soil according to the curve of the unfrozen water content of the frozen soil sample of the layer where the electrode patch is located, which is obtained in the step S10, along with the change of time;
a nondestructive measuring device for measuring the frozen soil moisture migration law of the measuring method of the nondestructive measuring device for the frozen soil moisture migration law comprises a container with openings at two ends, a controller, a plurality of electrode patches, a plurality of electrode connecting wires, a low-temperature circulator, an upper computer, an external measuring device and a water injection module; the low-temperature circulator comprises a first low-temperature circulating plate and a second low-temperature circulating plate which are connected with each other, the first low-temperature circulating plate is installed at one end of the container with the two open ends, the second low-temperature circulating plate is installed at the other end of the container with the two open ends, and the low-temperature circulator is used for controlling the temperature of the frozen soil sample placed in the container; one end of the controller is connected with the electrode connecting wire and is connected with the electrode patch through the electrode connecting wire; the other end of the controller is directly connected with an external measuring device; the controller is used for controlling the work of the electrode patch and acquiring an electric signal which is output by the electrode patch and used for measurement; the electrode patch is arranged on the inner wall of the container, is connected with an external measuring device through an electrode connecting wire and a controller in sequence, and is used for acquiring an input power signal or outputting an electric signal for measurement; the water injection module is connected with a water injection port of the low-temperature circulator and is used for injecting water into the container; the external measuring device is used for supplying power to the controller, providing an input power supply signal and acquiring an electric signal which is output by the electrode patch and is used for measurement through the controller; the upper computer is connected with the controller and is used for controlling the work of the electrode patch and controlling the temperature of the low-temperature circulator through the controller; the container with two open ends is a round organic glass cylinder with two open ends; the electrode patches are arranged on the inner wall of the container, specifically, the container is divided into a plurality of layers, a plurality of electrode patches are arranged on every other layer, and the electrode patches are connected with external measurement through electrode connecting wires and a controller and used for acquiring input power signals or outputting electric signals for measurement; the electrode patch is used for measuring the resistivity of the layer by a Van der Pauw method; the electrode paster is installed at the container inner wall, specifically for dividing the container into 20 layers, 4 electrode pasters are all installed to every other layer, the centre of a circle on layer is passed through to the connecting wire of first electrode paster and third electrode paster, and the centre of a circle on layer is passed through to the connecting wire of second electrode paster and fourth electrode paster, and the distance of first electrode paster and second electrode paster equals the distance of third electrode paster and fourth electrode paster.
2. The method for measuring the nondestructive measuring device for the frozen soil moisture migration law according to claim 1, wherein the water injection module comprises a martrio bottle and a water injection rubber tube; the Marterio bottle is connected with a water filling port of the low-temperature circulator through a water filling rubber tube and is used for filling water into the container.
3. The method according to claim 1 or 2, wherein the electrode patch is a thin copper electrode patch and is mounted on the inner wall of the container, and in particular, the electrode patch is adhered to the inner wall of the container by glue.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910656271.5A CN110333269B (en) | 2019-07-19 | 2019-07-19 | Nondestructive measuring device and method for frozen soil moisture migration rule |
| GB2010910.4A GB2587892B (en) | 2019-07-19 | 2020-07-15 | Apparatus for non-destructively measuring water migration law of frozen soil and measurement method thereby |
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| CN110333269B (en) * | 2019-07-19 | 2022-04-08 | 中南大学 | Nondestructive measuring device and method for frozen soil moisture migration rule |
| CN110823781B (en) * | 2019-11-22 | 2021-06-25 | 山东大学 | Multifunctional roadbed soil moisture migration experiment model box and experiment method |
| CN113419044B (en) * | 2021-06-02 | 2022-03-22 | 中国科学院西北生态环境资源研究院 | Method for calculating unfrozen water content of frozen soil based on clay diffusion layer ion concentration gradient |
| CN114460088A (en) * | 2021-12-22 | 2022-05-10 | 吉林大学 | Soil freezing-thawing cycle simulation device and NAPL phase migration quantitative identification method |
| CN117054315B (en) * | 2023-10-13 | 2024-01-09 | 东北林业大学 | Frozen soil permeability coefficient measurement system |
| CN117990889A (en) * | 2024-04-03 | 2024-05-07 | 西南石油大学 | Method for determining unfrozen water content of unsaturated soil |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5639229A (en) * | 1979-09-03 | 1981-04-14 | Mitsubishi Electric Corp | Soil freezing device |
| CN203287337U (en) * | 2013-06-04 | 2013-11-13 | 中国科学院寒区旱区环境与工程研究所 | Soil body freezing-thawing process visualized testing device |
| CN103743787A (en) * | 2013-12-23 | 2014-04-23 | 石家庄铁道大学 | Tri-axial testing device for testing water content distribution of soil sample |
| CN106093129A (en) * | 2016-06-03 | 2016-11-09 | 石家庄铁道大学 | Application VDP method test column soil body resistivity or water content affect collimation method |
| CN106771082A (en) * | 2017-01-17 | 2017-05-31 | 西安科技大学 | Content of unfrozen water in frozen earth detecting system and method based on soil body change in resistance |
| CN207396486U (en) * | 2017-11-20 | 2018-05-22 | 石家庄铁道大学 | Soil body moisture migrates measuring device |
Family Cites Families (1)
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5639229A (en) * | 1979-09-03 | 1981-04-14 | Mitsubishi Electric Corp | Soil freezing device |
| CN203287337U (en) * | 2013-06-04 | 2013-11-13 | 中国科学院寒区旱区环境与工程研究所 | Soil body freezing-thawing process visualized testing device |
| CN103743787A (en) * | 2013-12-23 | 2014-04-23 | 石家庄铁道大学 | Tri-axial testing device for testing water content distribution of soil sample |
| CN106093129A (en) * | 2016-06-03 | 2016-11-09 | 石家庄铁道大学 | Application VDP method test column soil body resistivity or water content affect collimation method |
| CN106771082A (en) * | 2017-01-17 | 2017-05-31 | 西安科技大学 | Content of unfrozen water in frozen earth detecting system and method based on soil body change in resistance |
| CN207396486U (en) * | 2017-11-20 | 2018-05-22 | 石家庄铁道大学 | Soil body moisture migrates measuring device |
Non-Patent Citations (1)
| Title |
|---|
| 土体电阻率测试及其在动力湿化试验中的应用;王志鹏;《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》;20170215(第02期);第10-25和44-54页 * |
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| GB2587892A (en) | 2021-04-14 |
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