System and method for wet-dry cycle test of soil and rock under continuous loading

Abstract

This invention discloses a soil-rock drying-wet cycle test system and method under continuous loading. The soil-rock drying-wet cycle test system under continuous loading includes a rock sample test chamber, in which rock samples are placed; a simulated precipitation system is located on the inner top of the rock sample test chamber; an electromagnetic load loading system is located inside the rock sample test chamber and on top of the rock sample to apply a moving load to the rock sample; and a ventilation and drying system is located on the side of the rock sample test chamber to ventilate and dry the rock sample. The electromagnetic load loading system includes a motion track located on top of the rock sample test chamber; an electromagnetic loading cylinder located on top of the rock sample; a lower pressure pad laid on the bottom of the rock sample; and an electromagnet located above the electromagnetic loading cylinder and within the motion track, which can reciprocate along the motion track under the drive of a magnet driving device; the end of the electromagnet near the electromagnetic loading cylinder has the same polarity as the electromagnetic loading cylinder. The system can automatically realize the drying-wet cycle, crushing, and screening of the rock sample.

Description

Technical Field

[0001] This invention belongs to the field of geotechnical engineering and relates to a soil-rock dry-wet cycle test system and method under continuous loading. Background Technology

[0002] Carbonaceous mudstone, as a soft rock, undergoes significant disintegration and softening under complex environmental conditions such as wet-dry cycles and superstructure loads. This leads to marked changes in its physical and mechanical properties, resulting in significant subgrade deformation and consequently impacting the stability of the engineering project. Therefore, to study the particle disintegration patterns of carbonaceous mudstone subgrades under wet-dry cycles and loads, and their impact on subgrade deformation, a test apparatus capable of simulating the combined effects of periodic wet-dry cycles and superstructure loads is needed. However, existing wet-dry cycle tests are often not conducted in a single space, requiring multiple transfers of rock samples. This not only wastes considerable time but also inevitably disturbs the rock samples and causes particle loss during these transfers, affecting the physical and mechanical properties of the rock and the accuracy of the test results.

[0003] Furthermore, traditional experiments often employ fixed-point loading methods. However, the load on the subgrade soil caused by vehicle load movement is actually a more complex process, involving multiple frequency components. When the vehicle load approaches the soil near the observation point, the principal stress axis rotates, a phenomenon known as the "movement effect." These factors influence the development of cumulative subgrade deformation, making fixed-point loading model tests difficult to accurately reflect the cumulative settlement of the subgrade system. Existing test devices considering the "movement effect" often use loading plates acting together, setting a phase difference in the loading periods of different plates. This method can roughly simulate the movement of the vehicle load, but it also has drawbacks such as stress concentration at the tips of the loading plates and difficulty in changing the load during the test. The loading plates are often large, and the force on each plate is basically uniformly distributed. In reality, the effect of the upper load diffuses and attenuates towards both sides. Using loading plates to simulate the upper load cannot accurately simulate the actual load distribution, leading to test results that do not match reality.

[0004] Therefore, a soil-rock wet-dry cycle test device is needed that can continuously provide upper load and more accurately simulate the effects of "movement effect" in order to better simulate and study the relevant engineering properties of soil and rock under the coupled environment of moisture, heat and force. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides a soil-rock wet-dry cycle test system and method under continuous loading conditions, which solves the problems of existing test devices that simulate the combined action of soil periodic wet-dry cycles and upper loads requiring multiple in-and-out movements of rock samples, thus disturbing the rock samples and causing loss of rock sample particles, as well as the problem that existing test devices that simulate the combined action of soil periodic wet-dry cycles and upper loads cannot accurately simulate the actual load distribution when using a loading plate to simulate upper load loading.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is a soil-rock wet-dry cycle test system under continuous loading, comprising:

[0007] Rock sample testing chamber; rock samples are placed inside the rock sample testing chamber.

[0008] A simulated precipitation system is installed on the inner top of the rock sample testing chamber to simulate precipitation.

[0009] An electromagnetic load application system is installed inside the rock sample testing chamber and on top of the rock sample to apply a moving load to the rock sample.

[0010] A ventilation and drying system is installed on the side of the rock sample testing chamber to ventilate and dry the rock samples.

[0011] Furthermore, the electromagnetic load loading system includes:

[0012] The motion track is located at the top of the rock sample testing chamber;

[0013] Electromagnetic loading cylinder, located at the top of the rock sample;

[0014] A pressure pad is placed at the bottom of the rock sample.

[0015] An electromagnet is located above an electromagnetic loading cylinder and is set within a motion track. Driven by a magnet drive device, the electromagnet can reciprocate along the motion track.

[0016] The polarity of the end of the electromagnet near the electromagnetic loading cylinder is the same as the polarity of the electromagnetic loading cylinder.

[0017] Furthermore, multiple electromagnetic loading cylinders are evenly distributed above the rock sample;

[0018] Each of the electromagnetic loading cylinders includes a cylinder wall;

[0019] The inner wall of the cylinder is provided with a waterproof membrane, a permanent magnet, a pressure sensor, and a lower pressure pad from top to bottom.

[0020] The permanent magnet and the electromagnet have the same polarity at their bottom ends.

[0021] Furthermore, the soil-rock wet-dry cycle test system under continuous loading also includes a crushing system;

[0022] The crushing system includes:

[0023] The crushing chamber is located on one side of the rock sample testing chamber. The rock sample testing chamber and the crushing chamber are separated by a rectangular baffle that can be opened, closed and locked vertically. The crushing chamber consists of an inner layer and an outer layer that are rotatably connected, and the outer layer of the crushing chamber is fixedly installed.

[0024] The demolding piston, which serves as the side wall of the rock sample test chamber away from the crushing chamber, is used to push the rock sample after the wet-dry cycle from the rock sample test chamber into the crushing chamber.

[0025] Crushing balls are located inside the inner layer of the crushing chamber.

[0026] A rotating motor is fixed to the outer layer of the crushing chamber at the end furthest from the rock sample test chamber, and the rotating shaft of the rotating motor is connected to the inner layer of the crushing chamber.

[0027] The size of the crushing chamber is larger than the size of the rock sample testing chamber.

[0028] Furthermore, an intermediate layer is provided between the inner and outer layers of the crushing chamber, the inner layer and the intermediate layer of the crushing chamber are rotatably connected, and the intermediate layer and the outer layer of the crushing chamber are slidably connected.

[0029] The rotary motor is detachably connected to the inner layer of the crushing chamber;

[0030] The middle layer of the crushing chamber is equipped with a movable handrail. The inner and middle layers of the crushing chamber can be moved linearly along their outer layers toward or away from the rotating motor, thereby connecting and disconnecting the crushing chamber from the rotating motor.

[0031] The outer bottom of the middle layer of the crushing chamber, near the rock sample test chamber, is equipped with a movable bracket;

[0032] The bottom of the movable bracket is fixedly connected to a threaded rocker rod that penetrates the outer layer of the crushing chamber and is threadedly connected to the outer layer of the crushing chamber.

[0033] By rocking the threaded rocker arm to raise and lower the movable bracket, the overall horizontal tilt angle of the inner and middle layers of the crushing chamber can be adjusted.

[0034] The crushing ball is a rubber ball with a Shore A hardness of 60-70.

[0035] Furthermore, a push-pull discharge port is provided on the side of the bottom of the crushing chamber away from the rock sample test chamber, and a screening system is provided at the bottom of the push-pull discharge port;

[0036] The screening system includes:

[0037] The screen is set up with multiple screens, which are set at an angle and arranged in layers from top to bottom;

[0038] Vibration motors are connected to each layer of screen via fixed arms. The vibration motors apply vibration to the fixed arms, thereby vibrating the screen.

[0039] Electric conveyor belts, each of which is positioned below each layer of screen;

[0040] A camera, each of the cameras being positioned above each of the electric conveyor belts;

[0041] Each of the rubber brushes is mounted above each of the electric conveyor belts and in front of the corresponding camera via a movable clamp.

[0042] Furthermore, the soil-rock wet-dry cycle test system under continuous loading also includes a control system, which includes a load control system, a precipitation control system, a drying control system, and a sieving control system.

[0043] The load control system includes:

[0044] The control host is located outside the rock sample testing chamber. The first output terminal of the control host is connected to the electromagnet, the second output terminal of the control host is connected to the magnet drive device, and the first input terminal of the control host is connected to the output terminal of the pressure sensor inside each electromagnetic loading cylinder. The load data measured by the pressure sensor is stored and a load distribution cloud map is generated.

[0045] The precipitation control system includes:

[0046] The intelligent water valve is installed at the water inlet of the simulated precipitation system.

[0047] A moisture content sensor is installed on the side of the rock sample.

[0048] The control host has its third output connected to the smart water valve and its second input connected to the output of the moisture content sensor. The control host controls the opening of the smart water valve to carry out precipitation according to the input precipitation command and precipitation intensity. The moisture content sensor measures the moisture content of the rock sample in real time and feeds it back to the control host. When the control host determines that the increase rate of the moisture content of the rock sample is less than 0.55% per hour, it controls the smart water valve to close and stop precipitation.

[0049] The drying control system includes:

[0050] A moisture content sensor and a temperature sensor are used, with the temperature sensor positioned on the side of the rock sample.

[0051] The control host has its fourth output connected to the fan and resistance heating wire of the ventilation and drying system, and its third input connected to the output of the temperature sensor. The control host controls the fan and resistance heating wire to automatically turn on to heat and dry the rock sample according to the input drying command, drying temperature and moisture content. The moisture content sensor measures the moisture content of the rock sample in real time and feeds it back to the control host. The temperature sensor measures the temperature of the rock sample in real time and feeds it back to the control host. When the control host determines that the temperature fed back by the temperature sensor is higher than the set drying temperature or the moisture content sensor detects that the moisture content has returned to the initial value, it controls the fan and resistance heating wire to automatically turn off and stop heating.

[0052] The screening control system includes:

[0053] Vibration motor switch: The vibration motor switch is installed on the power supply connection line of each vibration motor in the screening system.

[0054] Conveyor belt speed sensors are installed on the shaft of the motor of each electric conveyor belt in the screening system.

[0055] The control host has its fifth output terminal connected to the control terminal of the vibration motor switch. The output terminal of each conveyor belt speed sensor is connected to multiple input terminals of the control host in a corresponding manner. Each camera in the screening system is bidirectionally connected to the control host. The control host controls the vibration motor, electric conveyor belt, and camera to work according to the input screening instructions, vibration frequency, conveying speed, shooting instructions, and rock sample particle image acquisition frequency, so as to screen, convey, shoot, and identify the crushed rock sample particles.

[0056] Furthermore, the soil-rock wet-dry cycle test system under continuous loading also includes a laser scanning measurement system;

[0057] The laser scanning measurement system includes:

[0058] A laser emitter is located on one side of the rock sample testing chamber, and the side panel of the rock sample testing chamber closest to the laser emitter is made of a transparent observation plate.

[0059] The measuring and positioning lens is located at the bottom of the electromagnetic loading cylinder;

[0060] A fixed positioning lens is disposed on the side of the lower pressure pad near the laser emitter.

[0061] The simulated precipitation system includes:

[0062] The water injection port is located on the top outside the rock sample test chamber.

[0063] A precipitation nozzle is installed on the top inside the rock sample test chamber, and the water inlet is connected to the precipitation nozzle through an internal pipeline;

[0064] Drainage pipe, which connects to the bottom of the rock sample testing chamber;

[0065] The ventilation and drying system includes:

[0066] The ventilation duct is located on one side of the rock sample test chamber. The side wall where the ventilation duct connects to the rock sample test chamber is made of a perforated plate, and a waterproof and breathable membrane is installed on the perforated plate.

[0067] A resistance heating wire is located inside the ventilation duct.

[0068] The fan is located at the air inlet of the ventilation duct, connecting the ventilation duct to the external environment.

[0069] Another technical solution adopted in this invention is a method for testing soil and rock under continuous loading conditions through wet-dry cycling, which uses the soil and rock under continuous loading conditions wet-dry cycling test system as described above, and includes the following steps:

[0070] Step S1: Check that all parts are complete and usable, and ensure that the interior of the rock sample test chamber is dry and clean. Ensure that the rectangular baffle outside the rock sample test chamber is closed and locked. Set the test temperature and the number of wet-dry cycles. Prepare the rock sample. Before preparing the rock sample, dye the rock sample particles of four groups of particle sizes (20-40mm, 10-20mm, 5-10mm, and 0-5mm) with different colored dyes. Then, prepare the rock sample using a sample preparation machine. Install a fixed positioning lens on the side of the lower pressure pad near the laser emitter. Then, install the lower pressure pad into the rock sample test chamber. After arranging the moisture content sensor and temperature sensor on the side of the rock sample, place the rock sample on the lower pressure pad. Place permeable stones and filter paper at the top and bottom of the rock sample. Then, place an electromagnetic loading cylinder on the permeable stones and filter paper at the top of the rock sample. Arrange the moisture content sensor and temperature sensor. Then, install the demolding piston and laser emitter.

[0071] Step S2: Turn on the laser emitter, adjust the laser emitted by the laser emitter to align with the fixed positioning lens, obtain and record the position information of the bottom of the rock sample, and then adjust the laser emitter to continuously emit lasers above the fixed positioning lens to automatically obtain the deformation data of the rock sample.

[0072] Step S3: By controlling the host, the moving frequency, moving speed and magnetic field strength of the electromagnet are set, thereby setting the load applied by each electromagnetic loading cylinder above the rock sample and the load loading cycle, simulating the movement of the upper load.

[0073] Step S4: The load control system controls the electromagnetic load application system to apply the set load to the rock sample and collect data such as load magnitude, rock sample deformation, rock sample temperature, and rock sample moisture content. Then, the precipitation control system controls the intelligent water valve to open and supply water to the precipitation nozzles to start the wet-dry cycle. After the moisture content inside the rock sample no longer changes significantly, the water supply is stopped and the drain pipe is opened to drain excess water. Then, the drying control system controls the ventilation and drying system to heat and dry the rock sample until the moisture content of the rock sample returns to its initial value.

[0074] Step S5: Repeat step S4 until the preset number of dry and wet cycles is reached.

[0075] Step S6: After the wet-dry cycle is completed, open the rectangular baffle between the rock sample test chamber and the crushing chamber, remove the temperature sensor and moisture content sensor, open the demolding piston, and push the rock sample from the rock sample test chamber into the crushing chamber through the demolding piston. Then close and lock the rectangular baffle. Move the crushing chamber through the moving handle to connect it with the rotating motor, and then turn on the rotating motor to drive the crushing chamber to rotate and crush the rock sample. After the rock sample is crushed, move the crushing chamber through the moving handle to disengage it from the rotating motor, open the push-pull discharge port, and rotate the threaded rocker at the bottom of the crushing chamber to make the crushing chamber tilt horizontally, so that the crushed particles flow into the screening system through the push-pull discharge port.

[0076] In step S7, the position of each layer of rubber brushes is pre-adjusted using a movable clamp. Then, the vibration motor and electric conveyor belt of the screen are turned on layer by layer. After each layer of screen is screened, the camera will identify and record the data of each particle group after screening.

[0077] Furthermore, the method for conducting wet-dry cycle tests on soil under continuous loading also includes:

[0078] Step S8: Take out the rock sample particles sieved from each layer of screen, weigh the rock sample particles on different screens, then draw the sieve curve and obtain the particle disintegration data, readjust the type of rock sample, and repeat the previous steps S1 to S7.

[0079] In step S4, when the temperature data measured by the temperature sensor of the drying control system exceeds the preset drying temperature, the control system will sound an alarm and automatically shut down the ventilation and drying system to adjust the temperature of the rock sample in the rock sample test chamber to make the temperature lower than the set drying temperature.

[0080] The beneficial effects of this invention are:

[0081] It can simulate the deformation process of rock samples under the action of external environmental changes within a certain range. By combining electromagnets and electromagnetic loading cylinders, a moving load is applied to the rock sample. The stress diffusion under the action of the upper load can be simulated by the diffusion and attenuation phenomenon of the magnetic field strength of the electromagnet. The actual distribution of the load is simulated more accurately. The directional movement of the electromagnet is used to simulate the movement of the load, so as to more accurately consider the influence of the "movement effect" on the deformation of the rock sample. It is more in line with the actual engineering situation and solves the problem that the existing test device for simulating the periodic wet-dry cycle of soil and the combined action of the upper load cannot accurately simulate the actual distribution of the load when using the loading plate to simulate the upper load.

[0082] 2. During the wet-dry cycle, there is no need to move the rock sample, which avoids disturbance to the rock sample, reduces the test error, and solves the problem that the existing test device for simulating the periodic wet-dry cycle of soil and the combined action of the upper load requires multiple moving of the rock sample in and out, which disturbs the rock sample and causes the loss of rock sample particles.

[0083] 3. It includes a data acquisition system for automated data collection and processing, which can monitor mudstone deformation under different environmental and load conditions in real time, study the deformation law of rock samples caused by mudstone softening and disintegration under the coupling of moisture, heat and force, and the image recognition technology and equipment used can help to more intuitively and quantitatively study and analyze the disintegration law of rock sample particles.

[0084] This invention features a simple and novel structure, is easy to operate and assemble, highly automated, and reusable. It can automatically perform wet-dry cycles, crushing, and sieving of rock samples. It simulates the top seepage of soil and rock on the roadbed surface under external influences, improving experimental accuracy and efficiency. This device truly realizes the deformation simulation test of rocks under the influence of external heating, immersion, and pressure environments, as well as the study of particle breakage. Attached Figure Description

[0085] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0086] Figure 1 This is a front view schematic diagram of the soil-rock wet-dry cycle test system under continuous loading state according to an embodiment of the present invention.

[0087] Figure 2 This is a schematic diagram of the structure of the electromagnetic loading cylinder according to an embodiment of the present invention.

[0088] Figure 3 This is a schematic diagram of the arrangement of the electromagnetic loading cylinder on the rock sample according to an embodiment of the present invention.

[0089] Figure 4 This is a schematic diagram of the screening system according to an embodiment of the present invention.

[0090] Figure 5 This is a side view schematic diagram of the rock sample testing chamber, ventilation and drying system, and laser measurement system according to an embodiment of the present invention.

[0091] In the diagram, 1. Water inlet, 2. Intelligent water valve, 3. Demolding piston, 4. Drain pipe, 5. Motion track, 6. Electromagnetic loading cylinder, 6a. Waterproof membrane, 6b. Permanent magnet, 6c. Pressure sensor, 6d. Lower pressure pad, 6e. Cylinder wall, 6f. Measuring and positioning lens, 7. Rainfall nozzle, 8. Rock sample test chamber, 9. Ventilation duct, 10. Fan, 11. Rectangular baffle, 12. Crushing chamber, 13. Moisture content sensor, 14. Temperature sensor, 15. Lower pressure pad, 1 6. Fixed positioning lens, 17. Rock sample, 18. Resistance heating wire, 19. Movable bracket, 20. Threaded rocker arm, 21. Crushing ball, 22. Rotary motor, 23. Moving guide rail, 24. Push-pull discharge port, 25. Screening system, 25a. Fixed arm, 25b. Screen, 25c. Camera, 25d. Movable clamp, 25e. Rubber brush, 25f. Electric conveyor belt, 26. Control host, 27. Electromagnet, 28. Moving handrail, 29. Laser emitter. Detailed Implementation

[0092] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 are within the scope of protection of the present invention.

[0093] Example 1

[0094] This embodiment provides a soil-rock wet-dry cycle test system under continuous loading, including:

[0095] Rock sample test chamber 8, rock sample 17 is placed in rock sample test chamber 8;

[0096] A simulated precipitation system is installed on the inner top of rock sample test chamber 8 to simulate precipitation.

[0097] An electromagnetic load loading system is installed inside the rock sample test chamber 8 and on top of the rock sample 17 to apply a moving load to the rock sample 17.

[0098] A ventilation and drying system is installed at the rear of rock sample test chamber 8 to ventilate and dry rock sample 17.

[0099] like Figure 1 As shown, the simulated precipitation system includes:

[0100] Water injection port 1 is located on the top outside of rock sample test chamber 8;

[0101] Rainfall nozzle 7 is installed on the top inside the rock sample test chamber 8, and the water inlet 1 is connected to the rainfall nozzle 7 through an internal pipeline;

[0102] Drainage pipe 4 is connected to the bottom of rock sample test chamber 8;

[0103] An external water source enters the rock sample test chamber 8 through the water inlet 1 and supplies water to the precipitation nozzle 7 through the internal pipe to simulate the external natural precipitation environment. The drainage pipe 4 is used to drain the water accumulated at the bottom of the rock sample test chamber 8 after the test is completed.

[0104] The electromagnetic load loading system includes:

[0105] Motion track 5 is located on top of rock sample test chamber 8;

[0106] Electromagnetic loading cylinder 6 is located at the top of rock sample 17;

[0107] Lower pressure pad 15 is laid at the bottom of rock sample 17;

[0108] Electromagnet 27 is located above the electromagnetic loading cylinder 6 and is set in the motion track 5. Under the drive of the magnet driving device, the electromagnet 27 can reciprocate along the motion track 5. The magnet driving device can be an electric telescopic rod, a hydraulic rod, a linear motor, or other driving structures that can drive the electromagnet 27 to reciprocate linearly.

[0109] The polarity of the end of the electromagnet 27 near the electromagnetic loading cylinder 6 is the same as that of the electromagnetic loading cylinder 6. When the electromagnet 27 is energized, it generates magnetic force, which in turn exerts downward pressure on the electromagnetic loading cylinder 6, thus applying a load to the rock sample 17. At the same time, the electromagnet 27 moves at a set moving speed and moving frequency (the period of the reciprocating movement of the electromagnet 27) to realize the simulated loading of dynamic load.

[0110] like Figure 2As shown, each of the electromagnetic loading cylinders 6 includes a cylinder wall 6e. Inside the cylinder wall 6e, from top to bottom, are arranged a waterproof membrane 6a, a permanent magnet 6b, a pressure sensor 6c, and a lower pressure pad 6d. The permanent magnet 6b has the same polarity as the bottom end of the electromagnet 27. Under the action of the electromagnet 27 after energization, the permanent magnet 6b generates downward pressure, applying a load to the rock sample 17. The cylinder wall 6e eliminates the mutual influence between the permanent magnets 6b of each electromagnetic loading cylinder 6. The waterproof membrane 6a is used to prevent water from entering the electromagnetic loading cylinder 6. The pressure sensor 6c (… Figure 2 The convex structure is used to collect pressure data on the permanent magnet 6b.

[0111] In some embodiments, such as Figure 3 As shown, multiple electromagnetic loading cylinders 6 are evenly distributed above the rock sample 17, and all electromagnetic loading cylinders 6 are independent of each other and do not affect each other.

[0112] In some embodiments, the outer shell of the electromagnetic loading cylinder 6 is made of magnetic shielding plate; the waterproof membrane 6a is made of polyethylene material; and permeable stones and filter paper are provided between the lower pressure pad 6d of the electromagnetic loading cylinder 6 and the lower pressure pad 15 and the rock sample 17 to prevent the disintegrated and broken mudstone particles from blocking the seepage channels.

[0113] In some embodiments, such as Figure 1 and Figure 5 As shown, the ventilation and drying system includes:

[0114] Ventilation duct 9 is located on one side of the rock sample test chamber 8. The side wall where the ventilation duct 9 connects to the rock sample test chamber 8 is made of a porous plate. A waterproof and breathable membrane is provided on the porous plate. The waterproof and breathable membrane is a membrane made of microporous material (such as GORE-TEX membrane). It can prevent liquid water in the rock sample test chamber 8 from flowing out through the porous plate during the wet and dry cycle. At the same time, hot air in the ventilation duct 9 can dry the rock sample 17.

[0115] A resistance heating wire 18 is located inside the ventilation duct 9 to generate heat and heat the air inside the ventilation duct 9.

[0116] Fan 10 is installed at the air inlet of ventilation duct 9, connecting ventilation duct 9 with the external environment, so that hot air in ventilation duct 9 continuously enters rock sample test chamber 8 to dry rock sample 17.

[0117] In some embodiments, a transparent observation plate is used on one side of the rock sample test chamber 8. The transparent observation plate is made of polycarbonate and has the advantages of being lightweight, high-strength, heat-resistant, and corrosion-resistant.

[0118] In some embodiments, the soil-rock wet-dry cycle test system under continuous loading further includes a crushing system.

[0119] In some embodiments, the crushing system includes:

[0120] The crushing chamber 12 is located on one side of the rock sample test chamber 8. The rock sample test chamber 8 and the crushing chamber 12 are separated by a rectangular baffle 11 that can be opened, closed and locked vertically. The crushing chamber 12 consists of an inner layer and an outer layer that are rotatably connected. The outer layer of the crushing chamber 12 is fixedly installed.

[0121] Demolding piston 3, which serves as the side wall of the rock sample test chamber 8 away from the crushing chamber 12, is used to push the rock sample 17 after the wet-dry cycle from the rock sample test chamber 8 into the crushing chamber 12.

[0122] Crushing ball 21 is disposed inside the inner layer of crushing chamber 12;

[0123] Rotary motor 22 is fixed on the outer layer of crushing chamber 12 at one end away from rock sample test chamber 8, and the rotating shaft of rotary motor 22 is connected to the inner layer of crushing chamber 12.

[0124] The size of the crushing chamber 12 is larger than that of the rock sample test chamber 8, so that the inner layer of the crushing chamber 12 can rotate under the drive of the rotating motor 22, which can cause the rock sample 17 after the dry-wet cycle to collide and break with the crushing ball 21, thereby crushing the rock sample 17.

[0125] In some embodiments, an intermediate layer is provided between the inner layer and the outer layer of the crushing chamber 12, the inner layer and the intermediate layer of the crushing chamber 12 are rotatably connected, and the intermediate layer and the outer layer of the crushing chamber 12 are slidably connected.

[0126] The rotating motor 22 is detachably connected to the inner spline of the crushing chamber 12, which facilitates the connection and disconnection of the crushing chamber 12 and the rotating motor 22.

[0127] A movable handrail 28 is provided on the middle layer of the crushing chamber 12. The inner layer and the middle layer of the crushing chamber 12 can be moved linearly along their outer layer towards or away from the rotating motor 22, thereby realizing the connection and disconnection between the crushing chamber 12 and the rotating motor 22.

[0128] In some embodiments, the inner side of the outer layer of the crushing chamber 12 is provided with symmetrical moving guide rails 23, and the middle layer of the crushing chamber 12 is disposed on the moving guide rails 23. The inner layer and the middle layer of the crushing chamber 12 can be moved along the moving guide rails 23 by means of the moving handle 28.

[0129] In some embodiments, a movable bracket 19 is provided on the outer bottom of the middle layer of the crushing chamber 12 near the rock sample test chamber 8;

[0130] The bottom of the movable bracket 19 is fixedly connected to a threaded rocker arm 20 that penetrates the outer layer of the crushing chamber 12 and is threadedly connected to the outer layer of the crushing chamber 12.

[0131] By cranking the threaded rocker arm 20 to raise and lower the movable bracket 19, the height of the inner and middle layers of the crushing chamber 12 near the rock sample test chamber 8 can be adjusted, thereby adjusting the overall horizontal tilt angle of the inner and middle layers of the crushing chamber 12. After the rock sample 17 is crushed, the movable bracket 19 can be moved up and down by cranking the threaded rocker arm 20, thereby controlling the tilt of the inner and middle layers of the crushing chamber 12, which facilitates the discharge of rock sample particles.

[0132] In some embodiments, the crushing ball 21 is a rubber ball with a Shore A hardness of 60-70. The advantage of this rubber ball is that it has a certain hardness that can destroy the structure of the rock sample 17, but will not damage the rock particles in the rock sample 17.

[0133] In some embodiments, the rectangular baffle 11 has a groove on its side wall, and a rubber sealing strip is provided in the groove to ensure a sealed connection between the rectangular baffle 11 and the rock sample test chamber 8.

[0134] In some embodiments, the outer shells of the rectangular baffle 11, the demolding piston 3, the lower pressure pad 15, the rock sample test chamber 8, and the crushing chamber 12 are all made of stainless steel, which has high strength and is not easily corroded by water, thus extending its service life.

[0135] In some embodiments, the lower pressure pad 6d, the lower pressure pad 15, the rectangular baffle 11, and the demolding piston 3 are all coated with petroleum jelly.

[0136] In some embodiments, a push-pull discharge port 24 is provided on the side of the bottom of the crushing chamber 12 away from the rock sample test chamber 8, and a screening system 25 is provided at the bottom of the push-pull discharge port 24 to screen the rock particles crushed by the crushing chamber 12 and flowing out through the push-pull discharge port 24.

[0137] In some embodiments, such as Figure 4As shown, the screening system 25 includes a screen 25b, a camera 25c, an electric conveyor belt 25f, a vibration motor, and a rubber brush 25e. The vibration motor is connected to a fixed arm 25a on each layer of screen 25b and is used to apply vibration to the fixed arm 25a, thereby vibrating the screen 25b. Multiple screens 25b are provided, arranged obliquely and layered from top to bottom. Each electric conveyor belt 25f is positioned below each layer of screen 25b and is used to transport the contents of each layer of screen 25b. b. Rock sample particles after screening; each of the rubber brushes 25e is mounted above each of the electric conveyor belts 25f via a movable clamp 25d. Each of the rubber brushes 25e is used to flatten the rock sample particles after screening each layer of screen 25b. Each of the cameras 25c is set above each of the electric conveyor belts 25f to photograph the rock sample particles on the electric conveyor belts 25f and identify different rock sample particles, thereby obtaining data on particle disintegration. The camera 25c can be a high-definition high-speed camera. The rubber brushes 25e are made of hard rubber.

[0138] In some embodiments, the screen 25b is provided with four layers, and the apertures of the four layers of screen 25b from top to bottom are 40mm, 20mm, 10mm and 5mm respectively.

[0139] In some embodiments, the soil-rock wet-dry cycle test system under continuous loading further includes a control system, which includes a load control system, a precipitation control system, a drying control system, and a sieving control system.

[0140] The load control system includes:

[0141] Control host 26, which is located outside the rock sample test chamber 8;

[0142] The first output terminal of the control host 26 is connected to the electromagnet 27 to control the current of the electromagnet 27. The second output terminal of the control host 26 is connected to the magnet drive device to control the moving speed and moving frequency of the electromagnet 27, thereby realizing the electromagnetic simulation of the moving load. The first input terminal of the control host 26 is connected to the output terminal of each pressure sensor 6c to store the load data measured by the pressure sensor 6c and generate a load distribution cloud map to more intuitively reflect the load distribution of the rock sample 17 during the loading process, and adjust the position, moving frequency and load parameters of the electromagnet 27 accordingly.

[0143] The precipitation control system includes:

[0144] Intelligent water valve 2 is installed at water inlet 1;

[0145] Moisture content sensor 13 is disposed on the side of rock sample 17;

[0146] The control host 26 has its third output terminal connected to the intelligent water valve 2 and its second input terminal connected to the output terminal of the moisture content sensor 13. The control host 26 controls the opening of the intelligent water valve 2 to carry out precipitation according to the input precipitation command and precipitation intensity. The moisture content sensor 13 measures the moisture content of the rock sample 17 in real time and feeds it back to the control host 26. When the control host 26 determines that the increase rate of the moisture content of the rock sample 17 is less than 0.55% per hour, it is considered that the rock sample 17 is saturated, and the intelligent water valve 2 is closed to stop precipitation.

[0147] The drying control system includes:

[0148] A moisture content sensor 13 and a temperature sensor 14 are provided, with the temperature sensor 14 located on the side of the rock sample 17.

[0149] The control host 26 has a fourth output terminal connected to the fan 10 and the resistance heating wire 18, and a third input terminal connected to the output terminal of the temperature sensor 14. The control host 26 controls the fan 10 and the resistance heating wire 18 to automatically turn on to heat the rock sample 17 according to the input drying command, drying temperature and moisture content. The moisture content sensor 13 measures the moisture content of the rock sample 17 in real time and feeds it back to the control host 26. The temperature sensor 14 measures the temperature of the rock sample 17 in real time and feeds it back to the control host 26. When the control host 26 determines that the temperature fed back by the temperature sensor 14 is higher than the set drying temperature or the moisture content sensor 13 detects that the moisture content has returned to the initial value, it controls the fan 10 and the resistance heating wire 18 to automatically turn off and stop heating.

[0150] The screening control system includes:

[0151] Vibration motor switch, wherein the vibration motor switch is installed on the connection line between each vibration motor and the power supply;

[0152] Conveyor belt speed sensor, each of the conveyor belt speed sensors is mounted on the conveyor motor shaft of the corresponding electric conveyor belt 25f;

[0153] The control host 26 has its fifth output terminal connected to the control terminal of the vibration motor switch. The output terminal of each conveyor belt speed sensor is connected to one of the multiple input terminals of the control host 26. Each camera 25c is bidirectionally connected to the control host 26. The control host 26 controls the vibration motor, electric conveyor belt 25f, and camera 25c to work according to the input screening instructions, vibration frequency, conveying speed, shooting instructions, and rock sample particle image acquisition frequency, so as to screen, convey, shoot, and identify the crushed rock sample particles.

[0154] In some embodiments, the soil-rock wet-dry cycle test system under continuous loading further includes a laser scanning measurement system;

[0155] The laser scanning measurement system includes:

[0156] Laser emitter 29 is located on one side of rock sample test chamber 8, and the side plate of rock sample test chamber 8 near laser emitter 29 is a transparent observation plate;

[0157] The measuring and positioning lens 6f is set at the bottom of the electromagnetic loading cylinder 6;

[0158] Fixed positioning lens 16 is disposed on the side of the lower pressure pad 15 near the laser emitter 29;

[0159] The fixed positioning lens 16 is used to locate the bottom position of the rock sample 17, and the measuring positioning lens 6f is used to reflect the laser emitted by the laser emitter 29. When measuring deformation, the laser emitter 29 is first manually controlled to irradiate the fixed positioning lens 16 to obtain the bottom position information of the rock sample. Then, the laser emitter 29 is controlled to continuously emit laser to the position above the bottom of the rock sample 17 until the laser emitter 29 receives the laser reflected by the measuring positioning lens 6f. The laser emitter 29 can know the position information of the top of the rock sample 17 based on the received laser information, and then obtain the current height of the rock sample 17. It is compared with its initial height position data to obtain the vertical deformation of the rock sample 17 at this time and automatically feeds it back to the control host 26, thus realizing the measurement of the deformation of the rock sample 17.

[0160] Example 2

[0161] This invention provides a method for wet-dry cycle testing of soil and rock under continuous loading, comprising the following steps:

[0162] Step S1: Check that all parts are complete and usable, and ensure that the inside of the rock sample test chamber 8 is dry and clean. Ensure that the rectangular baffle 11 outside the rock sample test chamber 8 is closed and locked. Set the test temperature and the number of wet and dry cycles, and prepare the rock sample 17. Before preparing the rock sample 17, prepare samples of 20-40mm, 10-20mm, 5-10mm, and 0-mm diameters. Rock sample particles with four different diameters of 5 mm were stained with different colored dyes, and then rock sample 17 was prepared using a sample preparation machine. A fixed positioning lens 16 was installed on the side of the lower pressure pad 15 near the laser emitter 29, and then the lower pressure pad 15 was installed into the rock sample test chamber 8. After the moisture content sensor 13 and temperature sensor 14 were arranged on the side of the rock sample 17, the rock sample 17 was placed on the lower pressure pad 15, and permeable stones and filter paper were placed at the top and bottom of the rock sample 17. Then, an electromagnetic loading cylinder 6 was placed on the permeable stones and filter paper at the top of the rock sample 17, and the moisture content sensor 13 and temperature sensor 14 were arranged. Then, the demolding piston 3 and laser emitter 29 were installed.

[0163] Step S2: Turn on the laser emitter 29, adjust the laser emitted by the laser emitter 29 to be aligned with the fixed positioning lens 16, obtain and record the position information of the bottom of the rock sample 17, and then adjust the laser emitter 29 to continuously emit lasers above the fixed positioning lens 16 to automatically obtain the deformation data of the rock sample 17.

[0164] Step S3: By controlling the host 26, the moving frequency, moving speed and magnetic field strength of the electromagnet 27 are set, thereby setting the load magnitude and load loading cycle of each electromagnetic loading cylinder 6 on the upper part of the rock sample 17, and simulating the movement of the upper load.

[0165] Step S4: The load control system controls the electromagnetic load loading system to apply the set load to the rock sample 17 and collect data such as load magnitude, rock sample deformation, rock sample temperature, and rock sample moisture content. Then, the precipitation control system controls the intelligent water valve 2 to open and supply water to the precipitation nozzle 7 to start the wet-dry cycle. After the moisture content inside the rock sample 17 no longer changes significantly, the water supply is stopped and the drain pipe 4 is opened to drain excess water. Then, the drying control system controls the ventilation and drying system to heat and dry the rock sample 17 until the moisture content of the rock sample 17 returns to its initial value.

[0166] Step S5: Repeat step S4 until the preset number of dry and wet cycles is reached.

[0167] Step S6: After the dry-wet cycle is completed, open the rectangular baffle 11 between the rock sample test chamber 8 and the crushing chamber 12, remove the temperature sensor 14 and the moisture content sensor 13, open the demolding piston 3, and push the rock sample 17 from the rock sample test chamber 8 into the crushing chamber 12 through the demolding piston 3. Then close and lock the rectangular baffle 11. Move the crushing chamber 12 to connect it with the rotating motor 22 by moving the handle 28, and then turn on the rotating motor 22 to drive the crushing chamber 12 to rotate and crush the rock sample 17. After the rock sample 17 is crushed, move the crushing chamber 12 to disconnect it from the rotating motor 22 by moving the handle 28, open the push-pull discharge port 24, and rotate the threaded rocker arm 20 at the bottom of the crushing chamber 12 to make the crushing chamber 12 tilt horizontally, so that the crushed particles flow into the screening system 25 through the push-pull discharge port 24.

[0168] Step S7: The position of each layer of rubber brush 25e is pre-adjusted by the movable clamp 25d. Then, the vibration motor and electric conveyor belt 25f of the screen 25b are turned on layer by layer. After each layer of screen 25b is screened, the camera 25c will identify and record the data of each particle group after screening.

[0169] Step S8: Take out the rock sample particles sieved by each layer of screen 25b, weigh the rock sample particles on different screens 25b, then draw the sieving curve and obtain the particle disintegration data, readjust the type of rock sample 17, and repeat the previous steps S1 to S7.

[0170] In some embodiments, in step S4, when the temperature data measured by the temperature sensor 14 of the drying control system exceeds the preset threshold, the control system will alarm, and the drying control system will automatically shut down the ventilation and drying system to adjust the temperature of the rock sample 17 in the rock sample test chamber 8 so that the temperature is lower than the set drying temperature.

[0171] This embodiment can simulate the deformation process of mudstone sample 17 under the influence of changes in the external environment within a certain range. By applying a moving load to the rock sample through an electromagnetic load loading system, the influence of the "movement effect" on the deformation of rock sample 17 can be taken into account, which is more in line with the actual situation. Furthermore, the automated collection and processing of data allows for real-time monitoring of mudstone deformation under different environmental and load conditions, and the study of the deformation law of rock sample 17 caused by the softening and disintegration of mudstone under the coupling effect of moisture, heat, and force. The image recognition technology and equipment used in this embodiment help to more intuitively and quantitatively analyze the disintegration law of rock sample particles; and during the wet-dry cycle, it is not necessary to move rock sample 17, avoiding disturbance to rock sample 17 and reducing experimental errors.

[0172] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A soil-rock wet-dry cycle test system under continuous loading, characterized in that, include: Rock sample test chamber (8), rock sample (17) is placed in rock sample test chamber (8); A simulated precipitation system is set on the inner top of the rock sample test chamber (8) to simulate precipitation; An electromagnetic load loading system is installed inside the rock sample test chamber (8) and on top of the rock sample (17) to apply a moving load to the rock sample (17); A ventilation and drying system is installed on the side of the rock sample test chamber (8) to ventilate and dry the rock sample (17); The electromagnetic load loading system includes: The motion track (5) is set on top of the rock sample test chamber (8); Electromagnetic loading cylinder (6) is located at the top of rock sample (17); Lower pressure pad (15) is laid at the bottom of rock sample (17); Electromagnet (27) is located above the electromagnetic loading cylinder (6) and is set in the motion track (5). The electromagnet (27) can reciprocate along the motion track (5) under the drive of the magnet driving device. The polarity of the electromagnet (27) near the electromagnetic loading cylinder (6) is the same as that of the electromagnetic loading cylinder (6); Multiple electromagnetic loading cylinders (6) are evenly arranged above the rock sample (17); Each of the electromagnetic loading cylinders (6) includes a cylinder wall (6e); The inner wall of the cylinder (6e) is provided with a waterproof membrane (6a), a permanent magnet (6b), a pressure sensor (6c), and a lower pressure pad (6d) from top to bottom. The permanent magnet (6b) has the same polarity as the electromagnet (27) at its bottom end; It also includes the crushing system; The crushing system includes: The crushing chamber (12) is located on one side of the rock sample test chamber (8). The rock sample test chamber (8) and the crushing chamber (12) are separated by a rectangular baffle (11) that can be opened, closed and locked vertically. The crushing chamber (12) consists of an inner layer and an outer layer that are rotatably connected. The outer layer of the crushing chamber (12) is fixedly installed. Demolding piston (3), which serves as the side wall of the rock sample test chamber (8) away from the crushing chamber (12), is used to push the rock sample (17) after the wet-dry cycle from the rock sample test chamber (8) into the crushing chamber (12). Crushing ball (21) is disposed inside the inner layer of crushing chamber (12); Rotary motor (22) is fixed on the outer layer of the crushing chamber (12) at one end away from the rock sample test chamber (8), and the rotating shaft of the rotary motor (22) is connected to the inner layer of the crushing chamber (12); The size of the crushing chamber (12) is larger than the size of the rock sample test chamber (8).

2. The soil-rock wet-dry cycle test system under continuous loading as described in claim 1, characterized in that, An intermediate layer is provided between the inner layer and the outer layer of the crushing chamber (12). The inner layer and the intermediate layer of the crushing chamber (12) are rotatably connected, and the intermediate layer and the outer layer of the crushing chamber (12) are slidably connected. The rotating motor (22) is detachably connected to the inner layer of the crushing chamber (12); A movable handrail (28) is provided on the middle layer of the crushing chamber (12). The inner layer and the middle layer of the crushing chamber (12) can be moved in a straight line along the outer layer towards or away from the rotating motor (22) through the movable handrail (28), so as to realize the connection and disconnection between the crushing chamber (12) and the rotating motor (22). The outer bottom of the middle layer of the crushing chamber (12) near the rock sample test chamber (8) is provided with a movable bracket (19). The bottom of the movable bracket (19) is fixedly connected to a threaded rocker arm (20) that penetrates the outer layer of the crushing chamber (12) and is threadedly connected to the outer layer of the crushing chamber (12); By rocking the threaded rocker arm (20) to drive the movable bracket (19) to rise and fall, the horizontal tilt angle of the inner and middle layers of the crushing chamber (12) can be adjusted. The broken ball (21) is a rubber ball with a Shore A hardness of 60~70.

3. The soil-rock wet-dry cycle test system under continuous loading as described in claim 1, characterized in that, A push-pull discharge port (24) is provided on the side of the bottom of the crushing chamber (12) away from the rock sample test chamber (8), and a screening system (25) is provided at the bottom of the push-pull discharge port (24). The screening system (25) includes: Screen (25b), multiple screens (25b) are provided, and the multiple screens (25b) are arranged obliquely and layered from top to bottom; Vibration motors are connected to each layer of screen (25b) via fixed arms (25a). The vibration motors apply vibration to the fixed arms (25a), thereby vibrating the screen (25b). Electric conveyor belts (25f), each of which is arranged below each layer of screen (25b); Cameras (25c), each of the cameras (25c) is positioned above each of the electric conveyor belts (25f); Rubber brushes (25e), each of which is mounted above each of the electric conveyor belts (25f) and in front of the corresponding camera (25c) via a movable clamp (25d).

4. The soil-rock wet-dry cycle test system under continuous loading as described in any one of claims 1 to 3, characterized in that, It also includes a control system, which includes a load control system, a precipitation control system, a drying control system, and a screening control system; The load control system includes: The control host (26) is located outside the rock sample test chamber (8). The first output end of the control host (26) is connected to the electromagnet (27), the second output end of the control host (26) is connected to the magnet drive device, and the first input end of the control host (26) is connected to the output end of the pressure sensor (6c) inside each electromagnetic loading cylinder (6). The load data measured by the pressure sensor (6c) is stored and a load distribution cloud map is generated. The precipitation control system includes: Intelligent water valve (2) is installed at the water inlet (1) of the simulated precipitation system; A moisture content sensor (13) is installed on the side of the rock sample (17); The control host (26) is connected to the intelligent water valve (2) at its third output end and to the output end of the moisture content sensor (13) at its second input end. The control host (26) controls the opening of the intelligent water valve (2) to carry out precipitation according to the input precipitation command and precipitation intensity. The moisture content sensor (13) measures the moisture content of the rock sample (17) in real time and feeds it back to the control host (26). When the control host (26) determines that the increase rate of the moisture content of the rock sample (17) per hour is less than 0.55%, it controls the intelligent water valve (2) to close and stop precipitation. The drying control system includes: A moisture content sensor (13) and a temperature sensor (14) are provided, with the temperature sensor (14) located on the side of the rock sample (17). The control host (26) has its fourth output terminal connected to the fan (10) and resistance heating wire (18) of the ventilation and drying system. The third input terminal of the control host (26) is connected to the output terminal of the temperature sensor (14). The control host (26) controls the fan (10) and resistance heating wire (18) to automatically turn on to heat and dry the rock sample (17) according to the input drying command, drying temperature and moisture content. The moisture content sensor (13) measures the moisture content of the rock sample (17) in real time and feeds it back to the control host (26). The temperature sensor (14) measures the temperature of the rock sample (17) in real time and feeds it back to the control host (26). When the control host (26) determines that the temperature fed back by the temperature sensor (14) is higher than the set drying temperature or the moisture content sensor (13) detects that the moisture content has returned to the initial value, the control fan (10) and resistance heating wire (18) are automatically turned off to stop heating. The screening control system includes: Vibration motor switch, the vibration motor switch is set on the connection line between each vibration motor and the power supply in the screening system (25); Conveyor belt speed sensors are installed on the conveyor motor shaft of each electric conveyor belt (25f) in the screening system (25). The control host (26) has its fifth output terminal connected to the control terminal of the vibration motor switch. The output terminal of each conveyor belt speed sensor is connected to the multiple input terminals of the control host (26) in a one-to-one correspondence. Each camera (25c) of the screening system (25) is bidirectionally connected to the control host (26). The control host (26) controls the vibration motor, electric conveyor belt (25f) and camera (25c) to work according to the input screening command, vibration frequency, conveying speed, shooting command, and rock sample particle image acquisition frequency, so as to screen, convey, shoot and identify the crushed rock sample particles.

5. The soil-rock wet-dry cycle test system under continuous loading as described in any one of claims 1 to 3, characterized in that, It also includes laser scanning measurement systems; The laser scanning measurement system includes: Laser emitter (29) is located on one side of rock sample test chamber (8), and the side plate of rock sample test chamber (8) near laser emitter (29) is made of transparent observation plate; A measuring positioning lens (6f) is set at the bottom of the electromagnetic loading cylinder (6); A fixed positioning lens (16) is disposed on the side of the lower pressure pad (15) near the laser emitter (29); The simulated precipitation system includes: Water injection port (1) is located on the top outside of the rock sample test chamber (8); Rainfall nozzle (7) is located on the top inside the rock sample test chamber (8), and the water inlet (1) is connected to the rainfall nozzle (7) through an internal pipeline; Drainage pipe (4) is connected to the bottom of rock sample test chamber (8); The ventilation and drying system includes: Ventilation duct (9) is located on one side of the rock sample test chamber (8). The side wall of the ventilation duct (9) connected to the rock sample test chamber (8) is made of a porous plate and a waterproof and breathable membrane is provided on the porous plate. A resistance heating wire (18) is located inside the ventilation duct (9); The fan (10) is located at the air inlet of the ventilation duct (9) and connects the ventilation duct (9) with the external environment.

6. A method for testing soil and rock under continuous loading conditions through wet-dry cycles, characterized in that, The soil-rock wet-dry cycle test system under continuous loading as described in any one of claims 1 to 5 includes the following steps: Step S1: Check that all parts are complete and usable, and ensure that the inside of the rock sample test chamber (8) is dry and clean. Ensure that the rectangular baffle (11) outside the rock sample test chamber (8) is closed and locked. Set the test temperature and the number of wet and dry cycles, and prepare the rock sample (17). Before preparing the rock sample (17), cut 20 ~ 40 mm, 10 ~ 20 mm, 5 ~ 10 mm, and 0 ~ Rock sample particles with four different diameters of 5 mm were stained with different colored dyes, and then rock samples (17) were prepared using a sample preparation machine. A fixed positioning lens (16) was installed on the side of the lower pressure pad (15) near the laser emitter (29), and then the lower pressure pad (15) was installed into the rock sample test chamber (8). After the moisture content sensor (13) and temperature sensor (14) were arranged on the side of the rock sample (17), the rock sample (17) was placed on the lower pressure pad (15), and permeable stones and filter paper were placed at the top and bottom of the rock sample (17). Then, an electromagnetic loading cylinder (6) was placed on the permeable stones and filter paper at the top of the rock sample (17), and the moisture content sensor (13) and temperature sensor (14) were arranged. Then, the demolding piston (3) and laser emitter (29) were installed. Step S2: Turn on the laser emitter (29), adjust the laser emitted by the laser emitter (29) to be aligned with the fixed positioning lens (16), obtain and record the position information of the bottom of the rock sample (17), and then adjust the laser emitter (29) to continuously emit lasers above the fixed positioning lens (16) to automatically obtain the deformation data of the rock sample (17). Step S3: By controlling the host (26), the moving frequency, moving speed and magnetic field strength of the electromagnet (27) are set, thereby setting the load size and load loading cycle of each electromagnetic loading cylinder (6) on the upper part of the rock sample (17) to simulate the movement of the upper load. Step S4: The electromagnetic load loading system is controlled by the load control system to apply the set load to the rock sample (17) and collect data such as load size, rock sample deformation, rock sample temperature, and rock sample moisture content. Then, the intelligent water valve (2) is opened by the precipitation control system to supply water to the precipitation nozzle (7) and start the wet-dry cycle. After the moisture content inside the rock sample (17) no longer changes significantly, the water supply is stopped and the drain pipe (4) is opened to drain the excess water. Then, the ventilation drying system is controlled by the drying control system to heat and dry the rock sample (17) until the moisture content of the rock sample (17) returns to the initial value. Step S5: Repeat step S4 until the preset number of dry and wet cycles is reached. Step S6: After the wet-dry cycle is completed, open the rectangular baffle (11) between the rock sample test chamber (8) and the crushing chamber (12), remove the temperature sensor (14) and the moisture content sensor (13), open the demolding piston (3), and push the rock sample (17) from the rock sample test chamber (8) into the crushing chamber (12) through the demolding piston (3). Then close and lock the rectangular baffle (11); move the crushing chamber (12) through the moving handle (28) to connect it to the rotating motor (22), and then... Then, the rotating motor (22) is turned on to drive the crushing chamber (12) to rotate and crush the rock sample (17). After the rock sample (17) is crushed, the crushing chamber (12) is moved by the moving handle (28) to disengage it from the rotating motor (22), and the push-pull discharge port (24) is opened. By rotating the threaded rocker (20) at the bottom of the crushing chamber (12), the crushing chamber (12) is tilted horizontally, so that the crushed particles flow into the screening system (25) through the push-pull discharge port (24). In step S7, the position of each layer of rubber brush (25e) is pre-adjusted by the movable clamp (25d), and then the vibration motor and electric conveyor belt (25f) of the screen (25b) are turned on layer by layer. After each layer of screen (25b) is screened, the camera (25c) will identify and record the data of each particle group after screening.

7. The method for testing soil and rock under continuous loading conditions through wet-dry cycles according to claim 6, characterized in that, Also includes: Step S8: Take out the rock sample particles sieved by each sieve (25b), weigh the rock sample particles on different sieves (25b), then draw the sieve curve and obtain the particle disintegration data, readjust the type of rock sample (17), and repeat the previous steps S1 to S7. In step S4, when the temperature data measured by the temperature sensor (14) of the drying control system exceeds the preset drying temperature, the control system will alarm and automatically shut down the ventilation drying system to adjust the temperature of the rock sample (17) in the rock sample test chamber (8) so that the temperature is lower than the set drying temperature.

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