Dry-wet cycle system and test system for geotechnical resistivity test

Abstract

The utility model belongs to geotechnical test field discloses a kind of dry-wet cycle system and test system for geotechnical resistivity test, dry-wet cycle system includes dry-wet cycle container, bearing plate, heating system, drainage vapor valve, water seepage interlayer, geotextile, water pipe valve and water tank.Test system includes dry-wet cycle system, power, adjustable resistance and voltage acquisition device.Simulate the dry-wet alternate process experienced by geotechnical material, facilitate to observe the surface change phenomenon of geotechnical material under the condition of multiple dry-wet cycles, ensure the accuracy and stability of resistivity measurement.Prevent geotechnical sample from spilling and blocking heating channel by setting bearing plate.Drainage vapor valve is located at the top of dry-wet cycle container, for discharging generated water vapor during experiment, keep the pressure balance inside container.The design of water seepage interlayer and geotextile as buffer layer further promotes the uniform penetration of moisture.In addition, it also has the advantages of simple and safe operation, low cost.

Description

Technical Field

[0001] This utility model belongs to the field of geotechnical testing, and relates to a dry-wet cycle system and testing system for geotechnical resistivity testing. Background Technology

[0002] In recent years, with the rapid development of science and technology and the deepening of engineering practice, applying geophysical methods to solve practical engineering problems has become a highly anticipated cutting-edge research field. As a science that explores the physical properties and structure of the Earth's interior, its applications are becoming increasingly widespread, from mineral resource exploration and geological disaster prediction to environmental engineering assessment, all demonstrating its unique appeal. Among them, the resistivity method, as an important branch of geophysical methods, has emerged as a prominent force in environmental geotechnical engineering research due to its non-invasiveness, high efficiency, and accuracy.

[0003] The resistivity method is a method for inferring the physical, chemical, and mechanical properties of soil by measuring its resistivity. As one of the inherent physical properties of soil, soil resistivity not only reflects the soil's electrical conductivity but is also closely related to various factors such as water content, pore structure, mineral composition, and temperature. In environmental geotechnical engineering, the application of the resistivity method is widespread. Whether it's the monitoring and remediation of contaminated sites, the detection and management of groundwater, or the early warning and prevention of geological disasters such as landslides and debris flows, the resistivity method provides engineers with strong decision-making support due to its unique advantages. Through resistivity measurement, the distribution of soil conductivity can be understood, thereby inferring the soil's structural characteristics, moisture content, and potential pollutant migration paths, providing a scientific basis for the design and construction of environmental geotechnical engineering projects.

[0004] However, despite the significant achievements of resistivity methods in environmental geotechnical engineering research, existing resistivity testing devices and technologies still have many limitations. Currently, most resistivity testing devices are mainly used for conventional geotechnical tests of soil and rock masses. These tests are often conducted in laboratories, where the soil conditions are relatively simple and cannot realistically simulate the complex state changes of soil in actual engineering projects. Soil and rock masses, as complex porous media in nature, are influenced by the combined effects of water-thermal-mechanical coupling. In a dry state, soil may exhibit low conductivity; while in a wet state, due to the presence of moisture and enhanced pore water connectivity, the conductivity of the soil may increase significantly. This makes it difficult to accurately predict and assess changes in soil conductivity under different states in practical engineering, affecting the safety and reliability of projects. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a dry-wet cycle system and testing system for testing the resistivity of soil and rock.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The first aspect of this utility model provides a wet-dry cycle system for testing the resistivity of soil and rock, comprising: a wet-dry cycle container; a positive copper plate and a negative copper plate respectively disposed on both sides of the wet-dry cycle container; the interior of the wet-dry cycle container for accommodating the soil and rock sample to be tested; a load-bearing plate; the load-bearing plate is disposed below the soil and rock sample to be tested during use; a heating system; disposed below the load-bearing plate, and the load-bearing plate adopts a pull-out design, which can be pulled out or inserted between the heating system and the soil and rock sample to be tested; a drain valve; the drain valve is disposed at the top of the wet-dry cycle container; a permeable barrier; the permeable barrier is disposed above the soil and rock sample to be tested during use; a geotextile; the geotextile is disposed above the permeable barrier; a water pipe valve; the water pipe valve is disposed at the top of the wet-dry cycle container; and a water tank; the water tank is connected to the water pipe valve via a water pipe.

[0008] Optionally, the heating system includes: a heating mesh; an overheating insulation layer; the overheating insulation layer is disposed between the heating mesh and the load-bearing plate.

[0009] Optionally, a container base is also included; the container base is connected to the bottom of the wet-dry cycle container.

[0010] Optionally, a lifting platform is also included; the lifting platform is located below the water tank and is used for raising and lowering the water tank.

[0011] Optionally, a measuring ruler is installed on the water tank.

[0012] Optionally, the water tank is equipped with a water outlet valve, which is connected to a water pipe.

[0013] Optionally, the water pipe is a telescopic water pipe.

[0014] In a second aspect, this utility model provides a testing system for testing the resistivity of soil and rock, comprising: the aforementioned dry-wet cycle system; a power supply; the negative terminal of the power supply connected to a negative copper plate; an adjustable resistor; the positive terminal of the adjustable resistor connected to the positive terminal of the power supply, and the negative terminal of the adjustable resistor connected to a positive copper plate; a voltage acquisition device; the positive terminal of the voltage acquisition device connected to a positive copper plate, and the negative terminal of the voltage acquisition device connected to a negative copper plate; the voltage acquisition device is used to acquire the voltage drop between the positive and negative copper plates.

[0015] Optionally, the voltage acquisition device is a 458 type digital output acquisition card.

[0016] Optionally, it also includes a voltage measuring device; the voltage measuring device is connected in parallel with the adjustable resistor to measure the voltage across the adjustable resistor.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] This invention relates to a wet-dry cycle system for testing the resistivity of soil and rock. The wet cycle container cleverly simulates the natural wet-dry cycle process experienced by soil and rock materials, facilitating observation of surface changes under multiple wet-dry cycles. The container holds the soil and rock sample to be tested, while the positive and negative copper plates on both sides form the electrode system for resistivity testing, ensuring the accuracy and stability of the measurement. A load-bearing plate closes during sample preparation and humidification to prevent sample spillage and blockage of the heating channel, and opens during the heating test to cooperate with the opening of the steam drain valve and the closing of the water pipe valve, allowing water vapor to fully dissipate into the indoor environment. The steam drain valve, located at the top of the container, releases water vapor generated during the experiment, maintaining pressure balance inside the container. The water pipe valve is connected to the water tank via a water pipe, enabling precise water control of the soil and rock sample. The introduction of a permeable barrier and geotextile is another innovation in the system's detailed design. A permeable barrier layer is placed above the soil and rock sample to allow water to penetrate the material more evenly, avoiding experimental errors caused by uneven water distribution. The geotextile, acting as a buffer layer, not only further promotes uniform water penetration but also effectively reduces deformation of loose soil due to its inherent properties, improving the accuracy and reliability of the experiment. Furthermore, this wet-dry cycle system is simple, safe, and cost-effective. Its modular design makes it easy to assemble and disassemble components, greatly simplifying experimental preparation and post-processing workflows. The materials used are all common and reasonably priced industrial materials, lowering the cost threshold for the experiment and making it affordable for more researchers and institutions. This wet-dry cycle system not only provides a powerful tool for research in geotechnical engineering but also greatly enriches our understanding of the electrical properties of soil and rock materials under varying natural environments, providing a solid foundation for exploring the behavior of soil and rock under water-thermal-mechanical coupling.

[0019] This invention relates to a testing system for soil and rock resistivity testing. By integrating a wet-dry cycle system, it provides a stable and controllable wet-dry environment for soil and rock resistivity testing. The connection between the power supply and the positive and negative copper plates, along with the ingenious setting of the adjustable resistor, allows the system to flexibly adjust the test current to adapt to the testing needs of different soil and rock samples. The introduction of a voltage acquisition device enables accurate acquisition of the voltage drop between the positive and negative copper plates, providing an accurate data basis for resistivity calculation. This system not only improves the accuracy and reliability of soil and rock resistivity testing but also simplifies the testing process and improves testing efficiency through its modular design and flexible operation. Furthermore, the system is easy to maintain and upgrade, providing ample room for subsequent research and application, making it an ideal choice for resistivity testing in the field of geotechnical engineering. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the test system for testing the resistivity of soil and rock according to an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the dry and wet circulation container and its internal and external components according to an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the water-permeable barrier structure according to an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram illustrating the resistivity testing principle of an embodiment of this utility model.

[0024] Wherein: 1-Signal generator; 2-Positive power supply; 3-Negative power supply; 4-Adjustable resistor; 5-Positive resistor; 6-Negative resistor; 7-Positive copper plate; 8-Negative copper plate; 9-Dry and wet circulation container; 10-Water permeable barrier; 11-Water pipe valve; 12-Drainage valve; 13-Bearing plate; 14-Overheating barrier; 15-Heating mesh; 16-Container base; 17-Positive acquisition electrode; 18-Negative acquisition electrode; 19-Voltage acquisition device; 20-Geotextile; 21-Wire; 22-Water pipe; 23-Outlet valve; 24-Water tank; 25-Measuring tape; 26-Lifting platform. Detailed Implementation

[0025] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0026] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0027] The present invention will now be described in further detail with reference to the accompanying drawings:

[0028] See Figures 1 to 3 In one embodiment of this utility model, a dry-wet cycle system for testing the resistivity of rock and soil is provided. This device is capable of continuously and in real time simulating various dry and wet conditions of rock and soil materials. By simulating the rock and soil materials in dry and wet states, it is convenient to test the resistivity of rock and soil materials under different states, and it is also convenient to observe the surface changes of rock and soil materials under multiple dry-wet cycle conditions.

[0029] Specifically, the wet-dry cycle system for soil and rock resistivity testing of this utility model includes a wet-dry cycle container 9, a load-bearing plate 13, a heating system, a drain valve 12, a permeable partition 10, a geotextile 20, a water pipe valve 11, and a water tank 24. A positive copper plate 7 and a negative copper plate 8 are respectively installed on both sides of the wet-dry cycle container 9; the interior of the wet-dry cycle container 9 is used to hold the soil and rock sample to be tested; the load-bearing plate 13 is positioned below the soil and rock sample during use; the load-bearing plate 13 is positioned below the heating system and has a pull-out design, allowing it to be pulled out or inserted between the heating system and the soil and rock sample; the drain valve 12 is located at the top of the wet-dry cycle container 9; the permeable partition 10 is positioned above the soil and rock sample during use; the geotextile 20 is positioned above the permeable partition 10; the water pipe valve 11 is located at the top of the wet-dry cycle container 9; and the water tank 24 is connected to the water pipe valve 11 via a water pipe 22.

[0030] Specifically, the core of this wet-dry cycle system lies in its wet-dry cycle container 9, a design that cleverly simulates the alternating wet and dry processes experienced by soil and rock materials in nature. The interior of the wet-dry cycle container 9 holds the soil and rock sample to be tested, while the positive copper plate 7 and negative copper plate 8 positioned on both sides of the container form the electrode system for resistivity testing, ensuring the accuracy and stability of resistivity measurements. This design allows researchers to directly obtain the electrical parameters of soil and rock materials under specific wet-dry conditions, providing reliable data support for subsequent analysis and modeling.

[0031] The pull-out design of the load-bearing plate 13 is a major highlight of this system. Located beneath the soil and rock sample to be tested, it works in conjunction with the heating system below to achieve temperature control of the sample. By pulling out or inserting the load-bearing plate, researchers can flexibly adjust the heating state of the sample to simulate temperature changes under different seasons or climates. This design not only improves experimental flexibility but also greatly simplifies the complexity of experimental operations. Furthermore, the load-bearing plate 13 is closed during sample preparation and humidification to prevent soil and rock materials from spilling and blocking the heating channels. During the heating test, it is opened to cooperate with the opening of the drain valve 12 and the closing of the water pipe valve 11, allowing water vapor to fully dissipate into the indoor environment and ensuring the smooth progress of the experiment.

[0032] The inclusion of the steam drain valve 12 and the water pipe valve 11 further enhances the system's functionality and practicality. The steam drain valve 12, located at the top of the wet-dry circulation container 9, is used to release the water vapor generated during the experiment, maintaining pressure balance within the container. The water pipe valve 11, connected to the water tank 24 via a water pipe 22, enables precise water control of the soil and rock samples being tested. This design allows researchers to flexibly adjust the humidity conditions of the soil and rock samples as needed, simulating a more realistic natural environment.

[0033] The introduction of the permeable barrier layer 10 and geotextile 20 represents another innovation in the detailed design of this wet-dry cycle system. The permeable barrier layer 10, positioned above the soil and rock sample to be tested, allows water to penetrate the sample more evenly, avoiding experimental errors caused by uneven water distribution. The geotextile 20, acting as a buffer layer, not only further promotes uniform water penetration but also effectively reduces deformation of loose soil due to its inherent properties, improving the accuracy and reliability of the experiment.

[0034] Furthermore, this wet-dry cycle system boasts advantages such as simple and safe operation, and low cost. Its modular design makes the components easy to assemble and disassemble, greatly simplifying the workflow for experimental preparation and post-processing. At the same time, the system uses common and reasonably priced industrial materials, lowering the cost threshold for experiments and making such experiments affordable for more researchers and institutions.

[0035] In summary, the wet-dry cycle system for testing the resistivity of soil and rock not only provides a powerful tool for research in the field of geotechnical engineering, but also greatly enriches researchers' understanding of the electrical properties of soil and rock materials under changes in the natural environment, and facilitates the observation of surface changes in soil and rock materials under repeated wet-dry cycles. This system enables continuous, real-time monitoring of soil and rock materials under wet-dry cycle conditions, providing a solid experimental foundation for exploring the behavior of soil and rock under water-thermal-mechanical coupling.

[0036] In one possible implementation, the heating system includes a heating grid 15 and an overheating insulation layer 14; the overheating insulation layer 14 is disposed between the heating grid 15 and the load-bearing plate 13.

[0037] For example, the heating grid 15 may employ a heating device with adjustable power. Explained, by using a heating device with adjustable power as the heating grid 15, the output power of the heating system can be flexibly adjusted according to actual needs, thereby achieving more precise temperature control, improving heating efficiency, reducing energy waste, and making the heating system more energy-efficient, environmentally friendly, and adaptable.

[0038] In one possible implementation, a container base 16 is also included; the container base 16 is connected to the bottom of the wet-dry cycle container 9.

[0039] Explain that the container base 16 is primarily responsible for bearing the weight, ensuring the stability and safety of the wet-dry cycle container 9 during testing. By adding the container base 16, the weight of the wet-dry cycle container 9 and the soil and rock samples inside can be effectively distributed and supported, preventing the container from deforming or breaking due to excessive weight, thereby ensuring the accuracy and reliability of the test and extending the service life of the equipment.

[0040] In one possible implementation, a lifting platform 26 is also included; the lifting platform 26 is disposed below the water tank 24 and is used for lifting the water tank 24.

[0041] Interpretively, the height of the water tank 24 can be adjusted by controlling the lifting platform 26, thereby simulating seepage conditions at different water head heights. This design allows the experimental setup to more flexibly adapt to different testing needs, accurately simulate various seepage situations in actual engineering, provide more reliable data support for the study of seepage performance in geotechnical engineering, and improve the accuracy and practicality of the experiment.

[0042] In one possible implementation, a measuring scale 25 is provided on the water tank 24; the water pipe 22 is a telescopic water pipe.

[0043] Interpretively, by recording the outflow using ruler 25, the water level changes in tank 24 during the experiment can be visually monitored and recorded, thus accurately calculating the seepage volume. This design not only improves the accuracy of the experiment but also makes data recording more convenient and efficient, providing a reliable foundation for subsequent data analysis and research.

[0044] Meanwhile, the use of telescopic water pipe 22 also enhances the flexibility and adaptability of the experimental setup, enabling the experiment to proceed more smoothly.

[0045] In one possible implementation, the water tank 24 is provided with a water outlet valve 23, which is connected to the water pipe 22.

[0046] Explanatoryly, the outflow rate and duration of water from the water tank 24 can be controlled via the outlet valve 23, thereby achieving precise regulation of the seepage process. This design not only improves the operability of the experiment but also allows researchers to flexibly adjust the seepage conditions according to experimental needs, providing more accurate and reliable experimental data for the study of seepage performance in geotechnical engineering.

[0047] See you again Figure 1In another embodiment of this utility model, a testing system for testing the resistivity of soil and rock is provided, including the aforementioned dry-wet cycle system, a power supply 1, an adjustable resistor 4, and a voltage acquisition device 19. The negative terminal 3 of the power supply 1 is connected to the negative copper plate 8; the positive terminal 5 of the adjustable resistor 4 is connected to the positive terminal 2 of the power supply 1, and the negative terminal 6 of the adjustable resistor 4 is connected to the positive copper plate 7; the positive terminal 17 of the voltage acquisition device 19 is connected to the positive copper plate 7, and the negative terminal 18 of the voltage acquisition device 19 is connected to the negative copper plate 8; the voltage acquisition device 19 is used to acquire the voltage drop between the positive copper plate 7 and the negative copper plate 8.

[0048] This invention relates to a testing system for soil and rock resistivity testing. By integrating a wet-dry cycle system, it provides a stable and controllable wet-dry environment for soil and rock resistivity testing. The connection between the power supply 1 and the positive and negative copper plates 7 and 8, along with the ingenious design of the adjustable resistor 4, allows the system to flexibly adjust the test current to adapt to the testing needs of different soil and rock samples. The introduction of the voltage acquisition device 19 enables accurate acquisition of the voltage drop between the positive and negative copper plates 7 and 8, providing an accurate data basis for resistivity calculation. This system not only improves the accuracy and reliability of soil and rock resistivity testing but also simplifies the testing process and improves testing efficiency through its modular design and flexible operation. Furthermore, the system is easy to maintain and upgrade, providing ample room for subsequent research and application, making it an ideal choice for resistivity testing in the field of geotechnical engineering.

[0049] In one possible implementation, the voltage acquisition device 19 is a 458-type digital output acquisition card.

[0050] Explained, the Model 458 digital output acquisition card features high precision, high stability, and high reliability, enabling real-time and accurate acquisition of voltage drop data between the positive and negative copper plates. Using this specialized data acquisition card significantly improves the accuracy and efficiency of soil and rock resistivity testing, providing a reliable foundation for subsequent data analysis and research.

[0051] In one possible implementation, a voltage measuring device is also included, which is connected in parallel with the adjustable resistor 4 for measuring the voltage of the adjustable resistor 4.

[0052] Explaining this, by connecting a voltage measuring device in parallel with the adjustable resistor 4, the voltage across the adjustable resistor 4 can be monitored and recorded in real time. This helps researchers understand the voltage distribution in the circuit, ensuring correct circuit connection and stable operation. Simultaneously, the data from the voltage measuring device provides a basis for calculating the current of the adjustable resistor 4, enabling more precise control of test conditions and improving the accuracy and reliability of soil resistivity testing. For example, the voltage measuring device could be a multimeter.

[0053] See Figure 4 The testing principle of the testing system for soil and rock resistivity testing of this utility model is as follows:

[0054] The resistivity of a soil and rock sample refers to the resistance measured when an electric current passes through a unit volume of the soil and rock sample. The unit is Ω·m. It is an inherent basic physical property parameter of soil and rock, and its range is usually 1~105Ω·m.

[0055] In practical applications, the voltage across the adjustable resistor 4 is measured using a voltage measuring device, and then the current in the circuit is calculated. The voltage drop between the positive copper plate 7 and the negative copper plate 8, measured by a voltage acquisition device, was tested under the condition of constant current. The electrical resistance of the soil and rock sample was calculated based on Ohm's law. The resistivity of the soil and rock sample It can be calculated using the following formula:

[0056]

[0057] in, The area of ​​the positive electrode copper plate 7 or the negative electrode copper plate 8 is in meters. 2 In this embodiment, the positive electrode copper plate 7 and the negative electrode copper plate 8 have the same area; The distance between the positive copper plate 7 and the negative copper plate 8 is in meters (m).

[0058] In another embodiment of this utility model, a testing method based on the above-described testing system for testing the resistivity of soil and rock is provided, comprising the following steps: closing the drain valve 12 and the heating system; inserting a load-bearing plate 13 between the heating system and the soil and rock sample to be tested to compact the soil and rock sample; turning on the water pipe valve 11, and humidifying the soil and rock sample to be tested to a preset water volume through the water tank 24, water pipe 22, water pipe valve 11, geotextile 20, and permeable barrier 10; adjusting the adjustable resistor 4 to a set value, and turning on the power supply 1, collecting the voltage drop between the positive copper plate 7 and the negative copper plate 8 through the voltage acquisition device 19, and obtaining the resistivity of the soil and rock sample under humidification conditions based on the voltage drop between the positive copper plate 7 and the negative copper plate 8. Open the drain valve 12; remove the load-bearing plate 13 from between the heating system and the soil sample to be tested; turn on the heating system to heat the soil sample to be tested for a preset time; adjust the adjustable resistor 4 to the set value; turn on the power supply 1; collect the voltage drop between the positive copper plate 7 and the negative copper plate 8 through the voltage acquisition device 19; and obtain the resistivity of the soil sample under dry conditions based on the voltage drop between the positive copper plate 7 and the negative copper plate 8.

[0059] Specifically, after humidification or heating, the adjustable resistor 4 should be adjusted to a suitable position to ensure that the current in the circuit is neither too high nor too low. Then, turn on the power supply 1 and the voltage acquisition device 19 to ensure that the circuit is powered on and that data acquisition is normal. During the test, keep the soil and rock sample compacted to ensure that the sample is in close contact with the positive copper plate 7 and the negative copper plate 8.

[0060] For example, the water tank 24 can be adjusted to different heights by adjusting the lifting platform 26, thereby simulating seepage conditions at different water head heights. Furthermore, the water volume can be monitored in real time using the measuring tape 25.

[0061] For example, the heating time generally needs to exceed 24 hours to ensure that water vapor fully overflows from the soil and rock sample to be tested and is discharged from the water vapor drain valve 12.

[0062] The above content is only for illustrating the technical concept of this utility model and should not be construed as limiting the scope of protection of this utility model. Any modifications made to the technical solution based on the technical concept proposed in this utility model shall fall within the scope of protection of the claims of this utility model.

Claims

1. A wet-dry cycle system for testing the resistivity of soil and rock, characterized in that, include: A wet-dry cycle container (9); a positive copper plate (7) and a negative copper plate (8) are respectively set on both sides of the wet-dry cycle container (9); the inside of the wet-dry cycle container (9) is used to hold the soil and rock sample to be tested; Load-bearing plate (13); the load-bearing plate (13) is placed under the soil and rock sample to be tested during use; Heating system; set below the load-bearing plate (13), and the load-bearing plate (13) adopts a pull-out design, which can be pulled out or inserted between the heating system and the soil and rock sample to be tested; Drain steam valve (12); Drain steam valve (12) is located on top of the dry-wet circulation container (9); Permeable barrier (10); the permeable barrier (10) is placed above the soil and rock sample to be tested during use; Geotextile (20); Geotextile (20) is placed above the permeable barrier (10); Water pipe valve (11); Water pipe valve (11) is installed on top of the dry and wet circulation container (9); Water tank (24); Water tank (24) is connected to water pipe valve (11) via water pipe (22).

2. The wet-dry cycle system for testing soil and rock resistivity according to claim 1, characterized in that, The heating system includes: Heating mesh (15); Overheat insulation layer (14); the overheat insulation layer (14) is disposed between the heating grid (15) and the load-bearing plate (13).

3. The wet-dry cycle system for testing soil and rock resistivity according to claim 1, characterized in that, It also includes a container base (16); the container base (16) is connected to the bottom of the wet-dry cycle container (9).

4. The wet-dry cycle system for testing soil and rock resistivity according to claim 1, characterized in that, It also includes a lifting platform (26); the lifting platform (26) is located below the water tank (24) and is used for lifting the water tank (24).

5. The wet-dry cycle system for testing soil and rock resistivity according to claim 1, characterized in that, A measuring ruler (25) is installed on the water tank (24).

6. The wet-dry cycle system for testing soil and rock resistivity according to claim 1, characterized in that, The water tank (24) is equipped with a water outlet valve (23), which is connected to the water pipe (22).

7. The wet-dry cycle system for testing soil and rock resistivity according to claim 1, characterized in that, The water pipe (22) is a telescopic water pipe.

8. A testing system for testing the resistivity of soil and rock, characterized in that, include: The dry-wet cycle system according to any one of claims 1 to 7; Power supply (1); The negative terminal (3) of the power supply (1) is connected to the negative copper plate (8); Adjustable resistor (4); the positive terminal (5) of the adjustable resistor (4) is connected to the positive terminal (2) of the power supply (1), and the negative terminal (6) of the adjustable resistor (4) is connected to the positive copper plate (7). Voltage acquisition device (19); the positive terminal (17) of the voltage acquisition device (19) is connected to the positive copper plate (7), and the negative terminal (18) of the voltage acquisition device (19) is connected to the negative copper plate (8); the voltage acquisition device (19) is used to acquire the voltage drop between the positive copper plate (7) and the negative copper plate (8).

9. The testing system for testing the resistivity of soil and rock according to claim 8, characterized in that, The voltage acquisition device (19) is a 458 type digital output acquisition card.

10. The testing system for testing the resistivity of soil and rock according to claim 8, characterized in that, It also includes a voltage measuring device; the voltage measuring device is connected in parallel with the adjustable resistor (4) and is used to measure the voltage of the adjustable resistor (4).

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