CN118067799B - High-density electrical method monitoring device and monitoring method for large rock sample under high temperature and high pressure - Google Patents
High-density electrical method monitoring device and monitoring method for large rock sample under high temperature and high pressure Download PDFInfo
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- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The application provides a high-density electrical method monitoring device and a monitoring method for a large rock sample at high temperature and high pressure, wherein a plurality of electrodes are respectively arranged on the large rock sample in a grid shape, and the peripheries of the plurality of electrodes are filled with high-temperature and high-pressure resistant conductive adhesive; the electrodes of each row on the same monitoring surface of the large rock sample are connected through a first measuring line, the electrodes of each column on the same monitoring surface of the large rock sample are connected through a second measuring line, and the first measuring lines of each row and the second measuring lines of each column are respectively and correspondingly converged to the same main cable and connected to a high-density electrical method instrument; the cushion blocks are respectively arranged outside the corresponding side surfaces of the large rock sample at intervals; a plurality of insulating ceramic gaskets are covered on the electrodes and are respectively arranged between gaps of the large rock sample and the corresponding cushion blocks; and insulating sealant is covered on other outer surfaces of the large rock sample. The device and the method can provide three-dimensional distribution of the electrical structure inside the rock, and can obtain the electrical change characteristics of the rock in the unit-scale stratum environment.
Description
Technical Field
The application relates to the field of geotechnical engineering, in particular to a high-density electrical monitoring device and a monitoring method for a large rock sample under high temperature and high pressure.
Background
The deep underground engineering is in a three-high-disturbance environment, and the disaster inoculation process is the result of the co-evolution interaction of the rock mass and the environment quantity, so that the disaster characterization and inoculation process of the deep underground engineering has higher requirements on the physical quantity monitoring type and the monitoring range of the monitoring technology.
The electrical property of the rock is one of inherent physical properties of the rock, and is only closely related to the porosity, crack expansion condition and deformation condition of the rock under the condition of constant environmental factors, and when the rock is subjected to the actions of various factors such as load action, environmental change, chemical reaction and the like, the changes of the internal defects such as initiation, expansion, penetration and the like can be caused, so that the electrical property of the rock is changed, and related electrical parameters are influenced. Therefore, the electrical property change of the rock can be expressed by adopting conductivity or resistivity, and the internal fracture development expansion change condition can be reflected to quantify the internal damage of the rock. The rock conductivity test method can be generally classified into two different cases of indoor test and outdoor test. The indoor test can effectively control various influencing factors, and accurate conductivity values can be obtained easily.
The model physical test is used as a common method in the research of solid mechanics, has the characteristics of long research history, visual form and the like, and is widely applied to the research of rock mechanics. At present, many scholars research rock damage from different angles of mechanics, physical parameter characterization, electron microscope scanning and the like, and obtain rich research results. The electrical property of rock is an inherent physical property, and has been increasingly valued because of its extremely sensitive response characteristic to stress strain of rock due to its capability of reflecting the development and expansion of internal cracks.
However, the existing monitoring technology of the electrical properties of rock has the following problems: on one hand, the conventional rock electrical measurement mainly uses a dipolar method or a quadrupole method, and the internal electrical structure of the rock cannot be imaged in three dimensions; on the other hand, the object of conventional rock electrical measurements is mainly core scale, but the core does not contain joint fissures that determine representative unit body properties; in the last aspect, conventional rock electrical property measurement is mostly measurement under the high-temperature high-pressure core scale or simple uniaxial loading, and rock electrical property change characteristics in stratum environment cannot be truly simulated.
Disclosure of Invention
The application aims to provide a high-density electrical monitoring device and a high-density electrical monitoring method for a large rock sample at high temperature and high pressure, so as to solve the problem that the existing monitoring technology for the electrical property of rock cannot perform three-dimensional imaging.
The technical scheme of the application is as follows:
A high-density electrical monitoring device for a large rock sample at high temperature and high pressure comprises a plurality of electrodes, a plurality of cushion blocks and a plurality of insulating ceramic gaskets; the electrodes are respectively arranged on the large rock sample in a grid shape, and the peripheries of the electrodes are filled with high-temperature-resistant high-pressure-resistant conductive adhesive; the electrodes of each row on the same monitoring surface of the large rock sample are connected through a first measuring line, the electrodes of each column on the same monitoring surface of the large rock sample are connected through a second measuring line, and the first measuring line and the second measuring line of each row are respectively and correspondingly converged to the same main cable and connected to a high-density electric instrument; the cushion blocks are respectively arranged outside the corresponding side surfaces of the large rock sample at intervals; a plurality of insulating ceramic gaskets are covered on the electrodes and are respectively arranged between gaps of the large rock sample and the corresponding cushion blocks; and the other outer surfaces of the large rock sample are covered with insulating sealant.
As a technical scheme of the application, the electrode comprises a titanium electrode, a copper wire on the titanium electrode is connected to an electrode change-over switch through a cable interface, and a paint film is plated on the outer surface of the titanium electrode.
As a technical scheme of the application, the diameter of the titanium electrode is 1.9-2.1mm.
As one technical scheme of the application, the diameter of the titanium electrode is 2mm.
As a technical scheme of the application, a plurality of rows of the first measuring lines and a plurality of rows of the second measuring lines are arranged in a manner of crisscross, and the number of the first measuring lines and the number of the second measuring lines on the same monitoring surface of the large rock sample are 3.
As a technical scheme of the application, the lengths of the first measuring line and the second measuring line are 80cm, the distances between the adjacent first measuring lines are the same, and the distances between the adjacent second measuring lines are the same.
As one embodiment of the present application, a first pitch between adjacent electrodes in each row is the same, a second pitch between adjacent electrodes in each column is the same, and the first pitch is the same as the second pitch.
As a technical scheme of the application, 81 electrodes are arranged on the same monitoring surface of the large rock sample, the distance between the adjacent electrodes is 5cm, and the distance between the electrode at the outermost periphery and the edge of the large rock sample is 5cm.
The high-density electrical monitoring device for the high-temperature and high-pressure large rock sample is used for monitoring, and comprises the following steps:
s1, preprocessing the large rock sample by adopting a rock cutting mill, and polishing the end face of the large rock sample smoothly and flatly; drying all the large rock samples to remove water in the large rock samples; marking a designated position on the outer surface of the large rock sample according to the monitoring purpose and the testing requirement, and respectively marking and preprocessing the mounting position of the electrode;
s2, hole distribution of the electrode is completed by adopting a mode of combining hole punching fixation and high-temperature resistant conductive adhesive fixation;
S3, respectively adhering the electrodes to the large rock sample through the conductive adhesive, and sealing the surfaces of the electrodes and the large rock sample; after the conductive adhesive is smeared, the large rock sample is kept stand for 24 hours at normal temperature, after the conductive adhesive is primarily solidified, the large rock sample is put into high-temperature equipment and is set at 80 ℃ for constant-temperature heating for 24 hours, so that the electrode is fully coupled with the large rock sample through the conductive adhesive;
s4, fixing the manufactured large rock sample and the electrode in the high-temperature equipment together, and electrically connecting the electrode to each corresponding port of the high-density electrical instrument through a high-temperature and high-pressure resistant multi-core cable;
S5, electrically connecting the high-density electrical method instrument to a processing display operation port, setting specification parameters of the large rock sample, and setting position parameters, measurement parameters, signal port parameters and channel number parameters of the electrode;
S6, collecting each voltage signal by adopting the high-density electrical instrument, and if each electrode receives an obvious signal, displaying that the electrode and the high-density electrical instrument work normally;
s7, primarily measuring the rock resistivity of the large rock sample under normal temperature through the high-density electrical method instrument;
S8, after the rock resistivity of the large rock sample under the normal temperature condition is measured, starting the high-temperature equipment, setting the target temperature to be 100 ℃, the temperature rise time to be 15min and the heat preservation time to be 90min; after the temperature of the high-temperature equipment is raised to 100 ℃ and kept at the constant temperature for 60 minutes, starting to measure the rock resistivity of the large rock sample;
S9, after the rock resistivity of the large rock sample is measured when the target temperature is 100 ℃, starting the high-temperature equipment, setting the target temperature to 250 ℃, heating up for 15min and preserving heat for 90min; after the temperature of the high-temperature equipment is raised to 250 ℃ and the heat preservation is continued for 60min, the rock resistivity of the large rock sample is measured;
And S10, obtaining three-dimensional rock resistivity distribution inversion imaging according to the obtained rock resistivity measurement results of the large rock samples.
The application has the beneficial effects that:
according to the high-density electrical monitoring device and the monitoring method for the large rock sample at high temperature and high pressure, disclosed by the application, the advantages of the high-density method are fully utilized, and the three-dimensional distribution of the electrical structure in the rock can be obtained; and by measuring under a high-temperature high-pressure large rock sample, the rock electrical change characteristic under the unit-scale stratum environment can be obtained, so that an important theoretical basis is provided for the geotechnical engineering disaster inoculation mechanism. In addition, the resistivity distribution of the test sample in the high-temperature and high-pressure environment is monitored in real time and subjected to dynamic inversion by a high-density electrical method, three-dimensional rock resistivity distribution inversion imaging can be obtained, the positioning and evolution of the rock-soil body structural surface and the crack can be monitored in real time, and the anisotropy characterization, the fluid saturation, the seepage and the pollutant migration rule of the rock-soil can be monitored in real time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a high-density electrical monitoring device for a large rock sample at high temperature and high pressure according to an embodiment of the application;
fig. 2 is a schematic diagram of an electrode arrangement according to an embodiment of the present application.
Icon: 1-large rock sample; 2-insulating ceramic gaskets; 3-electrodes; 4-conductive adhesive; 5-cushion blocks; 6-a first line; 7-a second line; 8-high density electrical method instrument; 9-processing the display operation port; 10-multicore cable.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that, the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship in which the inventive product is conventionally put in use, are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore, should not be construed as limiting the present application.
Furthermore, in the present application, unless expressly stated or limited otherwise, a first feature may include first and second features being in direct contact, either above or below a second feature, or through additional feature contacts therebetween, rather than being in direct contact. Moreover, the first feature being above, over, and on the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being below, beneath, and beneath the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is less level than the second feature.
Furthermore, the terms "horizontal," "vertical," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
Examples:
Referring to fig. 1 in combination with fig. 2, the present application provides a high-density electrical monitoring device for a large rock sample at high temperature and high pressure, which mainly comprises a plurality of insulating ceramic gaskets 2, a plurality of electrodes 3 and a plurality of pads 5; wherein, a plurality of cushion blocks 5 are respectively arranged outside the corresponding side surfaces of the large rock sample 1 at intervals; a plurality of insulating ceramic gaskets 2 are covered on the electrode 3 and are respectively arranged between gaps of the large rock sample 1 and the corresponding cushion blocks 5; the other outer surfaces of the large rock sample 1 are covered with insulating sealant; the plurality of electrodes 3 are arranged on the outer surface of the large rock sample 1 in a grid shape, and the peripheries of the plurality of electrodes 3 are filled with high-temperature and high-pressure resistant conductive adhesive 4; meanwhile, the electrodes 3 of each row are connected through a first measuring line 6, the electrodes 3 of each column are connected through a second measuring line 7, and the first measuring lines 6 of each row and the second measuring lines 7 of each column are respectively and correspondingly converged to the same main cable and connected to a high-density electric instrument 8.
In this embodiment, the electrode 3 is a titanium electrode with a diameter of 1.9-2.1mm, the copper wire on the titanium electrode is connected to the switch of the electrode 3 through a cable interface, and a paint film is coated on the outer surface of the titanium electrode. Specifically, the electrode 3 may be a titanium electrode having a diameter of 2mm, or may be a titanium electrode having another size. In other embodiments, other metal electrodes may be used for the electrode 3, and the material, size and arrangement are not limited to those in the present embodiment.
The basic principle of high-density resistivity monitoring is to obtain the distribution state of the medium in the object field by judging the spatial distribution characteristics of the conductivity of the medium in the artificially formed electric field based on the conductivity difference of the medium based on the different conductivity (inverse of the resistivity) of different mediums. Taking the detection of abnormal bodies as an example, the distribution of equipotential lines of the electric field of the uniform geologic body is relatively uniform, the existence of the abnormal bodies can lead the distribution of equipotential lines of the electric field to generate larger distortion, and the voltage value of the electric field distribution change caused by the abnormal bodies is measured through the voltage electrode, so that the distribution condition of the underground resistivity can be reversely deduced, and the position of the abnormal bodies can be found out. In a deep simulator model machine, a high-density resistivity imaging unit generates underground stable current fields between different electrode pairs, and the resistivity distribution of rock is inverted according to the distribution rule of the current fields, so that the rock structural surface and crack positioning is realized. And the resistivity distribution is measured in real time in the compression deformation or disturbed process of the rock, and the evolution rule of the micro-cracks in the rock and the migration rule of the fluid in the pores are researched according to the evolution rules of the resistivity distribution of the rock at different moments. At present, a high-density resistivity imaging method provides visual and effective data for researches on the aspects of rock-soil body structural surface and crack positioning and evolution, anisotropic characterization, fluid saturation, seepage, pollutant migration law and the like. In order to realize the aim of high-precision electrical method monitoring in a deep engineering complex environment, the design content of high-density resistivity monitoring mainly comprises an electric field sensor design and a measuring device form design.
The design of the electric field sensor device is the key for realizing high-sensitivity and high-stability electric field measurement and developing electric method monitoring. Factors affecting the quality of the electric field have three main aspects, including electrical sensor performance, device form, and operating parameters. The electric field sensor is also called an electrode, the poor size of the electrode and the stability of the electrode are important factors influencing the quality of an electric field, the main electrode types at present are a common metal electrode, a liquid unpolarized electrode and a solid unpolarized electrode, and generally, the common metal electrode is easy to polarize, but has long service life, and the poor stability can be gradually stabilized along with the increase of the service time; the non-polarized electrode is extremely small, but occupies a large volume, is suitable for field detection, has shorter service life and is relatively suitable for short-term measurement. Under the high-temperature and high-pressure environment, copper and titanium are more suitable as electrode materials in view of economy, and the metal property of titanium is quite stable, and the anode electrode cannot pass through due to the protection of a stable oxidation layer, so that the anode electrode has good durability and stability under the brine electrolysis condition. Therefore, the device embeds the titanium electrode into the high temperature and high pressure resistant insulating ceramic washer 2 to achieve the condition of insulation from the outside, and leads the electrode wire out into the electrode transfer switch through the interface.
In consideration of the size and resolution of the test rock sample, the plurality of rows of first lines 6 and the plurality of rows of second lines 7 are arranged so as to cross each other, and the number of first lines 6 and the number of second lines 7 on the same monitoring surface of the large rock sample 1 are 3. Meanwhile, the lengths of the first measuring line 6 and the second measuring line 7 are 80cm, the distances between the adjacent first measuring lines 6 are the same, and the distances between the adjacent second measuring lines 7 are the same. Further, the first pitch between the adjacent electrodes 3 in each row is the same, the second pitch between the adjacent electrodes 3 in each column is the same, and the first pitch is the same as the second pitch. Specifically, in the present embodiment, the number of the electrodes 3 on the same monitoring surface of the large rock sample 1 is 81 in total, the interval between the adjacent electrodes 3 is 5cm, and the distance between the electrode 3 at the outermost periphery and the edge of the large rock sample 1 is 5cm. In other embodiments, the number of the electrodes 3 and the spacing between the adjacent electrodes 3 may take other configurations, and is not limited to the arrangement in the present embodiment. Therefore, titanium electrodes with the diameter of about 2mm are arranged on four surfaces (except upper and lower end surfaces) of the large rock sample 1, 24 measuring lines are designed, 81 electrodes 3 are arranged on each monitoring surface of the large rock sample 1 in total, the distance between the adjacent electrodes 3 is 5cm, wherein the distance between the electrodes 3 at the upper and lower ends is 5cm from the top or bottom of the rock sample, data acquisition is carried out by adopting an AMBN measuring mode, and other surfaces are consistent with the measuring modes.
In addition, in the embodiment, the method for monitoring the resistivity of the large rock sample at high temperature and high pressure is provided, and the method mainly adopts the high-density electrical monitoring device for the large rock sample at high temperature and high pressure for monitoring; the method mainly comprises the following steps:
S1, preprocessing a large rock sample 1 by adopting a rock cutting mill, and polishing the end face of the large rock sample 1 smoothly; drying all the large rock samples 1 to remove the water in the large rock samples 1; marking the appointed position of the outer surface of the large rock sample 1 according to the monitoring purpose and the testing requirement, and respectively marking and preprocessing the installation position of the electrode 3;
s2, hole distribution of the electrode 3 is completed by adopting a mode of combining perforation fixation and high-temperature resistant conductive adhesive 2 fixation and a precise table type electric drill platform with high precision and high rotating speed;
S3, respectively bonding the electrodes 3 on the large rock sample 1 through the high-temperature-resistant high-pressure-resistant conductive adhesive 4, and sealing the surfaces of the electrodes 3 and the large rock sample 1; after the conductive adhesive 4 is smeared, the large rock sample 1 is kept stand for 24 hours at normal temperature, after the conductive adhesive 4 is primarily solidified, the large rock sample 1 is put into high-temperature equipment and is set at 80 ℃ for constant-temperature heating for 24 hours, so that the electrode 3 is fully coupled with the large rock sample 1 through the conductive adhesive 4;
S4, fixing the manufactured large rock sample 1 and the electrode 3 together in high-temperature equipment, and electrically connecting the electrode 3 to each corresponding port of the high-density electrical instrument 8 through the high-temperature and high-pressure resistant multi-core cable 10;
s5, electrically connecting the high-density electrical method instrument 8 to a processing display operation port 9, setting specification parameters of the large rock sample 1, and setting position parameters, measurement parameters, signal port parameters and channel number parameters of the electrode 3;
s6, collecting each voltage signal by adopting a high-density electrical instrument 8, and if each electrode 3 receives an obvious signal, displaying that the electrode 3 and the high-density electrical instrument 8 work normally;
S7, primarily measuring the rock resistivity of the large rock sample 1 under the normal temperature condition by a high-density electrical method instrument 8;
s8, after the rock resistivity of the large rock sample 1 under the normal temperature condition is measured, starting high-temperature equipment, setting the target temperature to be 100 ℃, heating up for 15min and preserving heat for 90min; after the temperature of the high-temperature equipment is raised to 100 ℃ and kept at the constant temperature for 60 minutes, the rock resistivity of the large rock sample 1 is measured;
s9, after the rock resistivity of the large rock sample 1 at the target temperature of 100 ℃ is measured, starting high-temperature equipment, setting the target temperature of 250 ℃, the temperature rise time of 15min and the heat preservation time of 90min; after the temperature of the high-temperature equipment is raised to 250 ℃ and the heat preservation is continued for 60min, the rock resistivity of the large rock sample 1 is measured;
And S10, obtaining three-dimensional rock resistivity distribution inversion imaging according to the obtained rock resistivity measurement results of the large rock samples 1.
In summary, in the high-density electrical monitoring device and the monitoring method for the large rock sample at high temperature and high pressure, the advantages of the high-density method are fully utilized, and the three-dimensional distribution of the electrical structure in the rock can be obtained; and by measuring the large rock sample 1 under high temperature and high pressure, the rock electrical change characteristic under the unit scale stratum environment can be obtained, thereby providing an important theoretical basis for the geotechnical engineering disaster inoculation mechanism. In addition, the resistivity distribution of the test sample in the high-temperature and high-pressure environment is monitored in real time and subjected to dynamic inversion by a high-density electrical method, three-dimensional rock resistivity distribution inversion imaging can be obtained, the positioning and evolution of the rock-soil body structural surface and the crack can be monitored in real time, and the anisotropy characterization, the fluid saturation, the seepage and the pollutant migration rule of the rock-soil can be monitored in real time.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (8)
1. The high-temperature high-pressure high-density electrical monitoring device for the large rock sample comprises a plurality of electrodes, a plurality of cushion blocks and a plurality of insulating ceramic gaskets; the electrodes are respectively arranged on the large rock sample in a grid shape, and the peripheries of the electrodes are filled with high-temperature-resistant high-pressure-resistant conductive adhesive; the electrodes of each row on the same monitoring surface of the large rock sample are connected through a first measuring line, the electrodes of each column on the same monitoring surface of the large rock sample are connected through a second measuring line, and the first measuring line and the second measuring line of each row are respectively and correspondingly converged to the same main cable and connected to a high-density electric instrument; the cushion blocks are respectively arranged outside the corresponding side surfaces of the large rock sample at intervals; a plurality of insulating ceramic gaskets are covered on the electrodes and are respectively arranged between gaps of the large rock sample and the corresponding cushion blocks; insulating sealant is covered on other outer surfaces of the large rock sample; the method is characterized by comprising the following steps of:
s1, preprocessing the large rock sample by adopting a rock cutting mill, and polishing the end face of the large rock sample smoothly and flatly; drying all the large rock samples to remove water in the large rock samples; marking a designated position on the outer surface of the large rock sample according to the monitoring purpose and the testing requirement, and respectively marking and preprocessing the mounting position of the electrode;
s2, hole distribution of the electrode is completed by adopting a mode of combining hole punching fixation and high-temperature resistant conductive adhesive fixation;
S3, respectively adhering the electrodes to the large rock sample through the conductive adhesive, and sealing the surfaces of the electrodes and the large rock sample; after the conductive adhesive is smeared, the large rock sample is kept stand for 24 hours at normal temperature, after the conductive adhesive is primarily solidified, the large rock sample is put into high-temperature equipment and is set at 80 ℃ for constant-temperature heating for 24 hours, so that the electrode is fully coupled with the large rock sample through the conductive adhesive;
s4, fixing the manufactured large rock sample and the electrode in the high-temperature equipment together, and electrically connecting the electrode to each corresponding port of the high-density electrical instrument through a high-temperature and high-pressure resistant multi-core cable;
S5, electrically connecting the high-density electrical method instrument to a processing display operation port, setting specification parameters of the large rock sample, and setting position parameters, measurement parameters, signal port parameters and channel number parameters of the electrode;
S6, collecting each voltage signal by adopting the high-density electrical instrument, and if each electrode receives an obvious signal, displaying that the electrode and the high-density electrical instrument work normally;
s7, primarily measuring the rock resistivity of the large rock sample under normal temperature through the high-density electrical method instrument;
S8, after the rock resistivity of the large rock sample under the normal temperature condition is measured, starting the high-temperature equipment, setting the target temperature to be 100 ℃, the temperature rise time to be 15min and the heat preservation time to be 90min; after the temperature of the high-temperature equipment is raised to 100 ℃ and kept at the constant temperature for 60 minutes, starting to measure the rock resistivity of the large rock sample;
S9, after the rock resistivity of the large rock sample is measured when the target temperature is 100 ℃, starting the high-temperature equipment, setting the target temperature to 250 ℃, heating up for 15min and preserving heat for 90min; after the temperature of the high-temperature equipment is raised to 250 ℃ and the heat preservation is continued for 60min, the rock resistivity of the large rock sample is measured;
And S10, obtaining three-dimensional rock resistivity distribution inversion imaging according to the obtained rock resistivity measurement results of the large rock samples.
2. The method of monitoring resistivity of a rock sample at high temperature and high pressure according to claim 1, wherein the electrode comprises a titanium electrode, copper wires on the titanium electrode are connected to an electrode switch through a cable interface, and a paint film is plated on the outer surface of the titanium electrode.
3. The method for monitoring the resistivity of a large rock sample at high temperature and high pressure according to claim 2, wherein the diameter of the titanium electrode is 1.9-2.1mm.
4. A method of monitoring resistivity of a large rock sample at high temperature and pressure as claimed in claim 3, wherein the titanium electrode has a diameter of 2mm.
5. The method for monitoring the resistivity of a large rock sample at high temperature and high pressure according to claim 1, wherein a plurality of rows of the first measuring lines and a plurality of rows of the second measuring lines are arranged in a manner of crisscross, and the number of the first measuring lines and the number of the second measuring lines on the same monitoring surface of the large rock sample are 3.
6. The method for monitoring the resistivity of a large rock sample at high temperature and high pressure according to claim 5, wherein the lengths of the first measuring line and the second measuring line are 80cm, the distances between the adjacent first measuring lines are the same, and the distances between the adjacent second measuring lines are the same.
7. The method of high temperature high pressure large rock sample resistivity monitoring of claim 1, wherein a first spacing between adjacent ones of the electrodes in each row is the same, a second spacing between adjacent ones of the electrodes in each column is the same, and the first spacing is the same as the second spacing.
8. The method for monitoring the resistivity of a large rock sample at high temperature and high pressure according to claim 1, wherein 81 electrodes are arranged on the same monitoring surface of the large rock sample, the distance between the adjacent electrodes is 5cm, and the distance between the electrode at the outermost periphery and the edge of the large rock sample is 5cm.
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| CN115655379A (en) * | 2022-11-16 | 2023-01-31 | 山东大学 | High-density electrical monitoring device, system and method for stone cultural relic body |
| CN117686557A (en) * | 2023-12-04 | 2024-03-12 | 中国矿业大学 | Miniature direct-current resistivity three-dimensional inversion imaging rock-soil dynamic damage monitoring method |
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| KR101816674B1 (en) * | 2016-06-20 | 2018-01-12 | 한국지질자원연구원 | Apparatus for monitoring electrical resistivity of core sample |
| CN114166892B (en) * | 2021-12-09 | 2024-06-21 | 中国矿业大学 | Loaded rock sample damage self-potential imaging method based on network parallel electrical method |
| CN115639343B (en) * | 2022-10-09 | 2024-09-24 | 安徽理工大学 | Rock test piece damage evolution multi-parameter combined test device and method |
| CN115791896B (en) * | 2022-11-23 | 2024-02-13 | 山东大学 | High-temperature stratum grouting diffusion analysis test device and method based on resistivity detection |
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| CN117686557A (en) * | 2023-12-04 | 2024-03-12 | 中国矿业大学 | Miniature direct-current resistivity three-dimensional inversion imaging rock-soil dynamic damage monitoring method |
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