CN112255458A - High-pressure triaxial resistivity test system and method considering chemical permeation - Google Patents
High-pressure triaxial resistivity test system and method considering chemical permeation Download PDFInfo
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- CN112255458A CN112255458A CN202010927903.XA CN202010927903A CN112255458A CN 112255458 A CN112255458 A CN 112255458A CN 202010927903 A CN202010927903 A CN 202010927903A CN 112255458 A CN112255458 A CN 112255458A
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Abstract
The invention discloses a high-pressure triaxial resistivity test system and method considering chemical permeation, which comprises a base, a pressure bearing cylinder, a sample assembly and a data acquisition and processing system, wherein the sample assembly comprises an upper pressure head, a lower pressure head, a sample, a sealing layer and a detection electrode; a plurality of detection electrodes are distributed and arranged on the side surface of the sample to form an electrode array; flanges are symmetrically arranged on both sides of the upper pressure head and both sides of the lower pressure head, and the upper pressure head, the lower pressure head, the sample, the flanges and the detection electrode are wrapped and sealed by the sealing layer; the detection electrodes distributed on the side surface of the sample in the electrode array can be effectively sealed, confining pressure liquid is prevented from entering the sample, and therefore three-dimensional resistivity measurement is achieved in a triaxial test by using an inversion imaging method, and accuracy of a measurement result is guaranteed.
Description
Technical Field
The invention relates to a high-pressure triaxial resistivity testing system and method, in particular to a high-pressure triaxial resistivity testing system and method considering chemical permeation.
Background
The method for reflecting the physical and mechanical properties of the rock-soil material by measuring the resistivity of the sample is a common physical testing means, and in a triaxial test, the resistivity of the sample can be measured to research the resistivity properties of the material under different conditions, so that the method has important guiding significance for electrical prospecting.
The accuracy of the resistivity test determines the accuracy of the reflecting index. At present, the main test method of resistivity in the triaxial test is a two-phase electrode method, that is, electrodes are arranged at the upper end and the lower end of a sample, and the resistivity of the sample is obtained by measuring the voltage and the current at the two ends of the sample and converting according to ohm's law. The resistivity inversion imaging method is a new method for measuring resistivity, namely, an electrode array is arranged on the side surface of a sample, and the distribution rule of the resistivity in the sample is obtained by the resistivity inversion imaging method. The resistivity inversion imaging method can visually reflect the resistivity of different positions in a sample, can obtain more effective information, can reflect the anisotropy of rock, is more superior to a two-phase electrode method, and is applied to a uniaxial compression test.
If the resistivity is measured by using an inversion imaging method in a triaxial test, the sealing of the electrode is the problem to be considered firstly, and if the sealing is poor, confining pressure liquid enters the inside of a sample, so that the accuracy of the resistivity measurement is influenced, and the mechanical property of the sample is influenced; meanwhile, the size of the sample is small, the distance between the electrodes is close, and if the sample is wrapped by a conventional latex film, liquid in the sample can be gathered on the surface of the sample in the test process, so that the insulation between the electrodes is influenced, and the resistivity accuracy is further influenced; therefore, at present, a mode capable of effectively ensuring the sealing performance of the electrode does not exist, and then the three-dimensional resistivity measurement by using an inversion imaging method in a triaxial test cannot be realized.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a high-pressure triaxial resistivity testing system and method considering chemical permeation, which can effectively seal detection electrodes distributed on the side surface of a sample in an electrode array manner and prevent confining pressure liquid from entering the sample, thereby realizing three-dimensional resistivity measurement in a triaxial test by using an inversion imaging method and ensuring the accuracy of a measurement result.
In order to achieve the purpose, the invention adopts the technical scheme that: a high-pressure triaxial resistivity test system considering chemical permeation comprises a base, a pressure-bearing cylinder, a sample assembly, a piston rod, two permeation water pipes and a data acquisition and processing system, wherein the pressure-bearing cylinder is fixed on the base, a triaxial chamber is formed inside the pressure-bearing cylinder and the base, the sample assembly is arranged in the triaxial chamber, one end of the piston rod extends into the triaxial chamber from the top of the pressure-bearing cylinder, the two permeation water pipes are arranged in the triaxial chamber, and one end of each permeation water pipe extends out of the triaxial chamber through the base; a plurality of detection electrodes are distributed and arranged on the side surface of the sample to form an electrode array; flanges are symmetrically arranged on both sides of the upper pressure head and both sides of the lower pressure head, and the upper pressure head, the lower pressure head, the sample, the flanges and the detection electrode are wrapped and sealed by the sealing layer; one end of a water seepage hole in the upper pressure head extends out of the sealing layer through a pipe penetrating bolt to be communicated with the other end of one of the water seepage pipes; one end of a water seepage hole in the lower pressure head extends out of the sealing layer through a pipe penetrating bolt to be communicated with the other end of the other water seepage pipe; the data acquisition processing system passes through the base and the sealing layer through the lead and then is respectively connected with each detection electrode, and the joint of the lead and the base is sealed through an electrode plug.
Furthermore, the upper pressure head and the lower pressure head are made of insulating materials, and the diameters of the upper pressure head and the lower pressure head are the same as the diameter of the sample.
Further, the height of the upper pressure head is 50mm, the flange is positioned at a position 10mm away from the top of the upper pressure head, and the flange is 5mm thick and 10mm wide; the height of the lower pressure head is 70mm, and the flange is positioned 35mm away from the bottom of the lower pressure head, and the flange is 5mm thick and 10mm wide.
Furthermore, the detection electrodes are arranged in a three-dimensional mode to form an electrode array, and each detection electrode is fixed through conductive adhesive.
Further, the electrode array is parallel to the sample axis direction and arranges the row, and the contained angle is 90 between the row, and every row is 6 ~ 10 detecting electrode, and the hoop arranges 3 circles, and every circle is 8 ~ 12 detecting electrode.
A test method of a high-pressure triaxial resistivity test system considering chemical permeation comprises the following specific steps:
the method comprises the following steps: preparation of sample sealing liquid
Selecting liquid silica gel with the hardness of 20-40 ℃ after hardening as sample sealing liquid, pouring enough sealing liquid into an open container, putting the container into a vacuumizing device, and vacuumizing the sealing liquid for 1 hour to finish the application for later use;
step two: detection electrode arrangement
Welding a lead on one side of the detection electrodes, and sticking the detection electrodes on the side surface of the sample by adopting conductive adhesive according to the arrangement mode required by the electrode array, wherein the smearing area of the conductive adhesive is the same as the area of the electrodes;
step three: assembling of sample assembly
After the conductive adhesive is cured, arranging an upper pressure head, a lower pressure head, permeable stones and a sample according to set positions, placing the conductive adhesive on a three-section mold after the conductive adhesive is cured, enabling the axes of all the parts to be collinear, clamping the centers of the two ends of the upper pressure head and the lower pressure head by using a G-shaped clamp, adjusting the length of a screw rod in the G-shaped clamp to enable all the parts to be fully attached, enabling the clamping degree to be accurate to prevent the parts from falling after being lifted, and finally winding a paper adhesive tape on a part of a lead, which is 5mm away from a detection electrode;
step four: immersion liquid seal
Lifting the sample assembly by using a G-shaped clamp, completely immersing the sample assembly into the sealing liquid prepared in the step one, staying in the sealing liquid for 1 minute, lifting the sample assembly out, suspending the sample assembly in a thermostat, controlling the temperature of the thermostat to be between 40 and 50 ℃, immersing the sample assembly into the sealing liquid again for 1 minute after placing for 10 minutes to increase the thickness of the sealing liquid on the surface of the sample, repeating the steps until the thickness of the sealing liquid on the surface of the sample reaches a required value, and finally placing the sample assembly in the thermostat for 24 hours to fully cure the sealing liquid on the surface of the sample assembly to finally form a sealing layer; the thickness of the sealing layer is controlled to be 1-3 mm;
step five: sealing layer treatment
After the sealing liquid is completely cured, cutting the sealing layer at the joint of the G-shaped clamp and the upper pressure head and the sealing layer at the joint of the G-shaped clamp and the lower pressure head respectively by using a cutter, removing the G-shaped clamp, cutting the sealing layer at the top of the upper pressure head, the sealing layer on the lower side surface of a flange of the lower pressure head and the sealing layer on the lower surface of the flange of the lower pressure head by using the cutter, and finally removing the paper adhesive tape on the lead, wherein the sealing work of the sample;
step six: test system assembly
Firstly, fixing a sealed sample assembly on a base through a lower pressure head, enabling a lead to penetrate out of the base through an electrode joint to be connected with a data acquisition and processing system, communicating two permeable pipes with permeable water holes of an upper pressure head and the lower pressure head through pipe penetrating bolts respectively, then sealing and connecting a pressure bearing cylinder with the base, and adjusting a piston rod to enable the lower end of the piston rod to be just contacted with the top of the upper pressure head; injecting confining pressure liquid into the triaxial chamber to complete the assembly of the whole test system;
step seven: resistivity testing
According to a loading value required by the test, carrying out three-axis loading on the sample, starting a data acquisition processing system, acquiring the electrode potential in the electrode array by adopting a network parallel electrical method, interpreting the acquired data, carrying out three-dimensional inversion imaging, and finally obtaining a three-dimensional apparent resistivity image of the sample in a three-axis loading state, so that the seepage condition of the sample is analyzed according to the image.
Compared with the prior art, the invention comprises a base, a pressure-bearing cylinder, a sample assembly, a piston rod, two permeation water pipes and a data acquisition and processing system, and has the following advantages:
1. the sealing layer formed in a plastic dipping mode is formed in one step, the sealing effect between the sealing layer and the lead is good, surrounding pressure liquid cannot leak due to deformation, and meanwhile, the sealing layer is tightly attached to the pressure head and a leakage path is not easy to form; in addition, the sealing layer is tightly attached to the surface of the sample, so that liquid in the sample is prevented from being gathered between the electrodes, and the precision of a measuring result is effectively improved.
2. In the invention, the flanges are arranged on the upper pressure head and the lower pressure head, so that the seepage path is increased, and the dislocation generated between the sealing layer and the pressure head in the axial direction of the sample can be limited in the process of the triaxial test, thereby further preventing confining pressure liquid from permeating the sample and ensuring the sealing effect of the sealing layer.
3. According to the invention, a plurality of detection electrodes form an electrode array, a network parallel method is used for potential signal data acquisition, the overall distribution of the internal resistivity of the triaxial sample can be obtained by an inversion imaging method, and the anisotropy of the resistivity of the sample can be researched according to a resistivity image. In addition, a plurality of detection electrodes are arranged in a three-dimensional array form combining the axial direction and the annular direction, and higher resistivity imaging precision is obtained by using less electrodes, so that the number of wires needing to be sealed is effectively reduced, and the sealing stability is improved.
Drawings
FIG. 1 is a schematic diagram of the test system of the present invention;
FIG. 2 is a schematic view of the distribution of the motor array of the present invention;
FIG. 3 is a schematic structural view showing a state in which a sample assembly is clamped before sealing in the present invention;
FIG. 4 is a schematic view of the structure of the sample module and the sealing layer according to the present invention.
In the figure: 1. a triaxial chamber; 2. an upper pressure head; 3. a lower pressure head; 4. a sample; 5. a permeable stone; 6. a wire; 7. an array of electrodes; 8. a data acquisition processing system; 9. a sealing layer; 10. a pressure-bearing cylinder; 11. a base; 12. a piston rod; 13. a water seepage pipe; 14. an electrode tab; 15. a flange; 16. permeating water holes; 17. a pipe penetrating bolt; 18. three-petal mold; 19. a detection electrode; 20. a G-shaped clip.
Detailed Description
The present invention will be further explained below.
As shown in fig. 1 to 3, a high-pressure triaxial resistivity test system considering chemical permeation comprises a base 11, a pressure-bearing cylinder 10, a sample assembly, a piston rod 12, two permeation pipes 13 and a data acquisition and processing system, wherein the pressure-bearing cylinder 10 is fixed on the base 11, a triaxial chamber 1 is formed inside the pressure-bearing cylinder 10 and the base 11, the sample assembly is arranged in the triaxial chamber 1, one end of the piston rod 12 extends into the triaxial chamber 1 from the top of the pressure-bearing cylinder 10, the two permeation pipes 13 are arranged in the triaxial chamber 1, one end of each permeation pipe extends out of the triaxial chamber 1 through the base 11, the sample assembly comprises an upper pressure head 2, a lower pressure head 3, a sample 4, a sealing layer 9 and a plurality of detection electrodes 18, the upper pressure head 2, the sample 4 and the lower pressure head 3 are coaxially arranged from bottom to bottom in sequence, and permeation stones 5 are arranged between the upper pressure head 2 and the sample 4 and between the sample 4 and the lower pressure head 3, the lower pressure head 3 of the sample assembly is, the upper pressure head 2 of the sample assembly is contacted with the piston rod 12; a plurality of detection electrodes 19 are distributed and arranged on the side surface of the sample 4 to form an electrode array 7; flanges 15 are symmetrically arranged on two sides of the upper pressure head 2 and two sides of the lower pressure head 3, and the upper pressure head 2, the lower pressure head 3, the sample 4, the flanges 15 and the detection electrode 19 are wrapped and sealed by the sealing layer 9; one end of a permeable hole 16 in the upper pressure head 2 extends out of the sealing layer 9 through a pipe penetrating bolt 17 to be communicated with the other end of one permeable pipe 13; one end of a permeable hole 16 in the lower pressure head 3 extends out of the sealing layer 9 through a pipe penetrating bolt 17 to be communicated with the other end of the other permeable pipe 13; the data acquisition processing system 8 is respectively connected with each detection electrode 19 after penetrating through the base 11 and the sealing layer 9 through the lead 6, and the joint of the lead 6 and the base 11 is sealed through the electrode plug 14.
Further, the upper pressure head 2 and the lower pressure head 3 are made of insulating materials, and the diameters of the upper pressure head 2 and the lower pressure head 3 are the same as the diameter of the sample 4.
Further, the height of the upper pressure head 2 is 50mm, and the flange 15 is positioned at a position 10mm away from the top of the upper pressure head 2, and the thickness of the flange is 5mm, and the width of the flange is 10 mm; the lower head 3 is 70mm high and the flange 15 is located 35mm from the bottom of the lower head 3 and is 5mm thick and 10mm wide.
Further, the plurality of detection electrodes 19 are three-dimensionally arranged to form the electrode array 7, and each detection electrode 19 is fixed by conductive adhesive.
Further, the electrode array 7 is parallel to 4 axis directions of sample and arranges the row, and the contained angle is 90 between the row, and 6 ~ 10 detecting electrode 19 are arranged to each row, and 3 rings are arranged to the hoop, and 8 ~ 12 detecting electrode 19 are arranged to each ring.
A test method of a high-pressure triaxial resistivity test system considering chemical permeation comprises the following specific steps:
the method comprises the following steps: preparation of sample sealing liquid
Selecting liquid silica gel with the hardness of 20-40 ℃ after hardening as sample sealing liquid, pouring enough sealing liquid into an open container, putting the container into a vacuumizing device, and vacuumizing the sealing liquid for 1 hour to finish the application for later use;
step two: detection electrode arrangement
Firstly, welding a lead on one side of the detection electrode 19, and sticking each detection electrode 19 on the side surface of the sample 4 by adopting conductive adhesive according to the arrangement mode required by the electrode array 7, wherein the smearing area of the conductive adhesive is the same as the electrode area;
step three: assembling of sample assembly
After the conductive adhesive is cured, arranging an upper pressure head 2, a lower pressure head 3, a permeable stone 5 and a sample 4 according to set positions, placing the conductive adhesive on a three-petal mold 18 after the conductive adhesive is cured, enabling the axes of all the parts to be collinear, clamping the centers of the two ends of the upper pressure head and the lower pressure head by using a G-shaped clamp 20, adjusting the length of a screw rod in the G-shaped clamp 20 to enable all the parts to be fully attached, enabling the clamping degree to be accurate to the standard that the conductive adhesive cannot fall off after being lifted, and finally winding a paper adhesive tape on the part, which is 5mm away from a detection;
step four: immersion liquid seal
Lifting the sample assembly by using a G-shaped clamp 20, completely immersing the sample assembly into the sealing liquid prepared in the step one, staying in the sealing liquid for 1 minute, lifting the sample assembly out, suspending the sample assembly in a thermostat, controlling the temperature of the thermostat to be between 40 and 50 ℃, immersing the sample assembly into the sealing liquid again for 1 minute after placing for 10 minutes to increase the thickness of the sealing liquid on the surface of the sample 4, repeating the steps until the thickness of the sealing liquid on the surface of the sample 4 reaches a required value, and finally placing the sample assembly in the thermostat for 24 hours to fully cure the sealing liquid on the surface of the sample assembly to finally form a sealing layer 9; the thickness of the sealing layer 9 is controlled to be 1-3 mm;
step five: sealing layer treatment
After the sealing liquid is completely cured, cutting the sealing layer 9 at the joint of the G-shaped clamp 20 and the upper pressure head 2 and the lower pressure head 3 by using a cutter respectively, removing the G-shaped clamp 20, cutting the sealing layer 9 at the top of the upper pressure head 2, the sealing layer 9 on the lower side surface and the lower surface of the flange 15 of the lower pressure head 3 by using a cutter, and finally removing the paper adhesive tape on the lead 6, wherein the sealing work of the sample assembly is completely finished;
step six: test system assembly
Firstly, fixing a sealed sample assembly on a base 11 through a lower pressure head 3, penetrating a lead 6 out of the base 11 through an electrode joint 14 to be connected with a data acquisition and processing system 8, respectively communicating two water seepage pipes 13 with water seepage holes 16 of an upper pressure head 2 and the lower pressure head 3 through pipe penetrating bolts 17, then hermetically connecting a pressure-bearing cylinder 10 with the base 11, and adjusting a piston rod 12 to ensure that the lower end of the piston rod is just contacted with the top of the upper pressure head 2; after confining pressure liquid is injected into the triaxial chamber 1, the whole test system is assembled;
step seven: resistivity testing
According to a loading value required by the test, carrying out three-axis loading on the sample, starting a data acquisition processing system 8, acquiring the electrode potential in the electrode array 7 by adopting a network parallel electrical method, interpreting the acquired data, carrying out three-dimensional inversion imaging, and finally obtaining a three-dimensional apparent resistivity image of the sample 4 in a three-axis loading state, so that the seepage condition of the sample is analyzed according to the image.
Claims (6)
1. A high-pressure triaxial resistivity test system considering chemical permeation comprises a base, a pressure-bearing cylinder, a sample assembly, a piston rod, two permeation water pipes and a data acquisition and processing system, wherein the pressure-bearing cylinder is fixed on the base, a triaxial chamber is formed inside the pressure-bearing cylinder and the base, the sample assembly is arranged in the triaxial chamber, one end of the piston rod extends into the triaxial chamber from the top of the pressure-bearing cylinder, the two permeation water pipes are arranged in the triaxial chamber, and one end of each permeation water pipe extends out of the triaxial chamber through the base,
the sample assembly comprises an upper pressure head, a lower pressure head, a sample, a sealing layer and a plurality of detection electrodes, wherein the upper pressure head, the sample and the lower pressure head are coaxially arranged from bottom to bottom in sequence, permeable stones are arranged between the upper pressure head and the sample and between the sample and the lower pressure head, the lower pressure head of the sample assembly is fixed with the base, and the upper pressure head of the sample assembly is in contact with the piston rod; a plurality of detection electrodes are distributed and arranged on the side surface of the sample to form an electrode array; flanges are symmetrically arranged on both sides of the upper pressure head and both sides of the lower pressure head, and the upper pressure head, the lower pressure head, the sample, the flanges and the detection electrode are wrapped and sealed by the sealing layer; one end of a water seepage hole in the upper pressure head extends out of the sealing layer through a pipe penetrating bolt to be communicated with the other end of one of the water seepage pipes; one end of a water seepage hole in the lower pressure head extends out of the sealing layer through a pipe penetrating bolt to be communicated with the other end of the other water seepage pipe; the data acquisition processing system passes through the base and the sealing layer through the lead and then is respectively connected with each detection electrode, and the joint of the lead and the base is sealed through an electrode plug.
2. The chemical infiltration considered high-pressure triaxial resistivity test system of claim 1 wherein the upper and lower indenters are both insulating materials and both have the same diameter as the sample diameter.
3. The high pressure tri-axial resistivity test system in consideration of chemical permeation of claim 1, wherein the upper indenter has a height of 50mm, a flange at a distance of 10mm from the top of the upper indenter, and a thickness of 5mm and a width of 10 mm; the height of the lower pressure head is 70mm, and the flange is positioned 35mm away from the bottom of the lower pressure head, and the flange is 5mm thick and 10mm wide.
4. The chemical permeation considered high-pressure triaxial resistivity test system of claim 1, wherein the plurality of detection electrodes are arranged in three dimensions to form an electrode array, and each detection electrode is fixed by a conductive adhesive.
5. The high-pressure triaxial resistivity test system considering chemical permeation according to claim 4, wherein the electrode arrays are arranged in rows parallel to the axial direction of the sample, included angles between the rows are 90 degrees, each row is provided with 6-10 detection electrodes, the electrodes are annularly arranged for 3 circles, and each circle is provided with 8-12 detection electrodes.
6. The test method of the high-pressure triaxial resistivity test system considering chemical infiltration according to any one of claims 1 to 5, characterized by comprising the following specific steps:
the method comprises the following steps: preparation of sample sealing liquid
Selecting liquid silica gel with the hardness of 20-40 ℃ after hardening as sample sealing liquid, pouring enough sealing liquid into an open container, putting the container into a vacuumizing device, and vacuumizing the sealing liquid for 1 hour to finish the application for later use;
step two: detection electrode arrangement
Welding a lead on one side of the detection electrodes, and sticking the detection electrodes on the side surface of the sample by adopting conductive adhesive according to the arrangement mode required by the electrode array, wherein the smearing area of the conductive adhesive is the same as the area of the electrodes;
step three: assembling of sample assembly
After the conductive adhesive is cured, arranging an upper pressure head, a lower pressure head, permeable stones and a sample according to set positions, placing the conductive adhesive on a three-section mold after the conductive adhesive is cured, enabling the axes of all the parts to be collinear, clamping the centers of the two ends of the upper pressure head and the lower pressure head by using a G-shaped clamp, adjusting the length of a screw rod in the G-shaped clamp to enable all the parts to be fully attached, enabling the clamping degree to be accurate to prevent the parts from falling after being lifted, and finally winding a paper adhesive tape on a part of a lead, which is 5mm away from a detection electrode;
step four: immersion liquid seal
Lifting the sample assembly by using a G-shaped clamp, completely immersing the sample assembly into the sealing liquid prepared in the step one, staying in the sealing liquid for 1 minute, lifting the sample assembly out, suspending the sample assembly in a thermostat, controlling the temperature of the thermostat to be between 40 and 50 ℃, immersing the sample assembly into the sealing liquid again for 1 minute after placing for 10 minutes to increase the thickness of the sealing liquid on the surface of the sample, repeating the steps until the thickness of the sealing liquid on the surface of the sample reaches a required value, and finally placing the sample assembly in the thermostat for 24 hours to fully cure the sealing liquid on the surface of the sample assembly to finally form a sealing layer, wherein the thickness of the sealing layer is controlled to be between 1 and 3 mm;
step five: sealing layer treatment
After the sealing liquid is completely cured, cutting the sealing layer at the joint of the G-shaped clamp and the upper pressure head and the sealing layer at the joint of the G-shaped clamp and the lower pressure head respectively by using a cutter, removing the G-shaped clamp, cutting the sealing layer at the top of the upper pressure head, the sealing layer on the lower side surface of a flange of the lower pressure head and the sealing layer on the lower surface of the flange of the lower pressure head by using the cutter, and finally removing the paper adhesive tape on the lead, wherein the sealing work of the sample;
step six: test system assembly
Firstly, fixing a sealed sample assembly on a base through a lower pressure head, enabling a lead to penetrate out of the base through an electrode joint to be connected with a data acquisition and processing system, communicating two permeable pipes with permeable water holes of an upper pressure head and the lower pressure head through pipe penetrating bolts respectively, then sealing and connecting a pressure bearing cylinder with the base, and adjusting a piston rod to enable the lower end of the piston rod to be just contacted with the top of the upper pressure head; injecting confining pressure liquid into the triaxial chamber to complete the assembly of the whole test system;
step seven: resistivity testing
According to a loading value required by the test, carrying out three-axis loading on the sample, starting a data acquisition processing system, acquiring the electrode potential in the electrode array by adopting a network parallel electrical method, interpreting the acquired data, carrying out three-dimensional inversion imaging, and finally obtaining a three-dimensional apparent resistivity image of the sample in a three-axis loading state, so that the seepage condition of the sample is analyzed according to the image.
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| CN112985982A (en) * | 2021-02-26 | 2021-06-18 | 中国矿业大学 | Electrical method monitoring device suitable for true triaxial loading and use method thereof |
| CN113281185A (en) * | 2021-06-18 | 2021-08-20 | 湖北工业大学 | Piezoresistive stress induction device for monitoring solidified heavy metal polluted soil and use method |
| CN113866223A (en) * | 2021-09-27 | 2021-12-31 | 中国矿业大学 | Sealing device and method for high-pressure triaxial resistivity test sample |
| CN116448823A (en) * | 2023-06-15 | 2023-07-18 | 中南大学 | Device and method for measuring resistivity of rock in hydraulic fracturing process under high-temperature and high-pressure conditions |
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