A Microwave-Assisted Rock Breaking Device and Test Method under True Triaxial Conditions

Abstract

The present invention provides a microwave-assisted rock-breaking device and test method under true triaxial conditions, belonging to the technical field of rock mechanics. The microwave-assisted rock-breaking device under true triaxial conditions includes: an operation table, a hob rock-breaking system, a microwave radiation heating system, an infrared thermal imaging probe, a hydraulic loading system, an acoustic emission positioning system, and a data acquisition system. During the experiment, the specimen is placed on the operation table, and microwave heating and hob cutting tests can be carried out. Through the present invention, the problem of using a disc cutter to break the rock after microwave radiation heating of the rock sample under true triaxial stress can be solved, thereby revealing the mechanical response and failure mechanism during the rock-breaking process.

Description

Technical Field

[0001] The present invention relates to the technical field of underground engineering rock mass tests, and particularly relates to a microwave-assisted rock-breaking device and a test method under true triaxial conditions. Background Art

[0002] With the continuous exploration towards the deep earth, traditional mechanical rock-breaking devices are still the main force for rock breaking. However, when traditional mechanical rock breaking encounters hard rocks with high strength, there are problems such as low rock-breaking efficiency, cutter head wear, large maintenance volume, and increased cost, seriously affecting the rock-breaking efficiency. Microwave-assisted rock breaking is a new type of hybrid rock-breaking method that combines microwave heating technology and mechanical rock-breaking technology. By heating the rock mass with microwaves, cracks are generated due to heat, reducing the strength of the rock mass, thereby reducing the cutter head wear of mechanical rock breaking and improving the rock-breaking efficiency.

[0003] In the aspect of microwave-assisted rock breaking under true triaxial conditions, domestic patents related to the present invention have achieved certain inventive results and innovations, but at the same time, there are more or less problems. On the one hand, most of the existing technologies in the microwave-assisted rock breaking system only prove the feasibility of microwave-assisted rock breaking, lacking hob tests under confining pressure conditions. The Chinese patent application "A Method and Device for Microwave Water Jet Cooperative Rock Breaking" with the application number "202010779133.9" provides a microwave + water jet combined rock breaking system, but no corresponding hob test is carried out. The Chinese patent application "A Microwave Rock Breaking System and Its Using Method" with the application number "202210433340.8" provides a microwave rock breaking system and its using method, but also lacks the corresponding hob test. The Chinese patent application "A Real-time Monitoring Test Device and Method for Microwave Rock Breaking Thermal Damage and Radon Emanation" with the application number "202310782020.8" provides a real-time monitoring test device for microwave rock breaking thermal damage and radon emanation, and monitors the test through means such as distributed fiber optic demodulators and resistivity tests, but also does not carry out a hob test. On the other hand, the monitoring of the existing theoretical tests in obtaining information on the whole process of rock breaking still needs to be improved, and it is difficult to accurately reveal the rock breaking mechanism. The Chinese patent application "A Microwave-assisted Rock Breaking Test Device" with the application number "202221115091.X" provides a microwave-assisted rock breaking test device and conducts a hob test, but lacks corresponding monitoring means. The Chinese patent application "A TBM Hob Rock Breaking Test Device and Method for Simulating Deep Conditions" with the application number "202310213745.5" provides a TBM hob rock breaking test device and method for simulating deep conditions, processes the rock sample by using microwave heating + liquid nitrogen cooling method, and then conducts a hob test, but also lacks corresponding monitoring means. The Chinese patent application "A Microwave-assisted TBM Hob Rock Breaking Test Device" with the application number "202010608006.2" provides a microwave-assisted TBM hob rock breaking test device, which can conduct cutting rock breaking tests of TBM hobs under the action of microwaves, but the monitoring means only has a temperature measuring device and does not simulate the situation with confining pressure. In addition, in the conducted hob tests, the rock breaking trajectories are mostly linear, which is inconsistent with the circular trajectory during rock breaking by a TBM shield machine.

[0004] Therefore, there is currently a lack of a device to simulate microwave-assisted rock breaking under confining pressure conditions and monitor related information, so as to reveal the mechanical response and failure mechanism during the rock breaking process. Summary of the Invention

[0005] In order to solve the problems mentioned in the background art, the present invention provides a microwave-assisted rock breaking device under true triaxial stress to solve the problem of rock breaking with a disk cutter after microwave radiation heating of a rock sample under true triaxial stress, so as to reveal the mechanical response and failure mechanism during the rock breaking process.

[0006] Specifically:

[0007] A rock-breaking device assisted by microwave under true triaxial conditions, which includes: an operating table, a hob rock-breaking system, a microwave radiation heating system, an infrared thermal imaging probe, a hydraulic loading system, an acoustic emission positioning system, and a data acquisition system;

[0008] The operating table includes a base and a specimen chamber; the specimen chamber is installed on the base; guide rods are provided on the base; a liftable cross plate is provided on the guide rods; a power control system is fixedly installed at the top of the guide rods; the piston rod of the telescopic hydraulic cylinder of the power control system is connected to the cross plate;

[0009] The hob rock-breaking system includes a hob disc frame and a hob disc driving motor; the hob disc frame is installed on the cross plate through a rotary bearing and faces the specimen chamber; hobs are provided on the hob disc frame; the hob disc driving motor is fixedly installed on the cross plate; the driving shaft of the hob disc driving motor is connected to the rotating shaft of the hob disc frame;

[0010] The microwave radiation heating system includes a microwave generating device, a waveguide, and a microwave emitter; the microwave emitter is installed on the cross plate and faces the specimen chamber; the microwave emitter is connected to the microwave generating device through the waveguide;

[0011] The infrared thermal imaging probe is fixedly installed on the cross plate;

[0012] The hydraulic loading system includes an X-axis hydraulic cylinder, a Y-axis hydraulic cylinder, a Z-axis hydraulic cylinder, and a true triaxial control device; the specimen chamber is divided into an inner layer and an outer layer; the inner layer is surrounded by five lining plates to form a cavity structure; the outer layer is surrounded by four cavity plates; the X-axis hydraulic cylinder and the Y-axis hydraulic cylinder are respectively fixedly installed on the cavity plates, and their piston rods are respectively connected to the corresponding lining plates in the corresponding directions; the Z-axis hydraulic cylinder is fixedly installed on the base, and its piston rod is connected to the bottom lining plate;

[0013] The acoustic emission positioning system includes an acoustic emission display device, an acoustic emission host, a preamplifier, and an acoustic emission probe; the acoustic emission probe is fixedly installed on the lining plate; the acoustic emission display device, the acoustic emission host, the preamplifier, and the acoustic emission probe are communicatively connected;

[0014] The hob rock-breaking system, the microwave radiation heating system, the infrared thermal imaging probe, the hydraulic loading system, and the acoustic emission positioning system are all communicatively connected to the data acquisition system.

[0015] Further, the hob disc frame is provided with 4 groups of the hobs, which are distributed in a cross shape.

[0016] Further, a number of hob mounting holes with different diameters are provided on the hob disc. Multiple sets of hob mounting holes are provided on the hob disc, which can be matched with hob combinations of different radii.

[0017] Further, the four liner plates in the X-axis and Y-axis directions are arranged in a staggered distribution in the shape of a rotating windmill.

[0018] Currently, in true triaxial tests, a rigid loading method (similar to the loading method in the present invention) is mostly adopted. However, the rigid loading method has a relatively large defect, that is, the specimen is often deformed under pressure during the loading process, which leads to extrusion of the liner plates. The traditional method is to leave a gap between the vertical and horizontal liner plates. However, the existence of this gap will lead to obvious boundary effects of the specimen, resulting in uneven stress and deformation during the test, and abnormal failure modes of the specimen. To avoid the abnormal fracture morphology of the rock under true triaxial conditions caused by this defect, the liner plates of the true triaxial specimen chamber in the present invention adopt a "rotating windmill shape" design, and the liner plates are placed in a staggered manner.

[0019] Further, a vertical frame is provided at the center below the cross plate; the vertical frame is divided into two sections, and the two sections are hinged; the microwave transmitter is fixedly installed at the other end of the vertical frame.

[0020] Further, the infrared thermal imaging probe is installed on the vertical frame through a robotic arm.

[0021] Further, the liner plate is provided with acoustic emission probe reserved holes; springs are provided in the acoustic emission probe reserved holes; the acoustic emission probes are installed in the acoustic emission probe reserved holes and are located at the front end of the springs.

[0022] Further, a soft gasket is provided between the acoustic emission probe and the spring.

[0023] Further, a pressure sensor is provided at the part of the hob disc where the hob is installed.

[0024] The present invention also provides a test method, which uses the above microwave-assisted rock breaking device under true triaxial conditions for testing. The test steps include:

[0025] S1. Place the rock sample to be tested in the inner layer of the specimen chamber, adjust the position, and apply a coupling agent on the surface of the area where the acoustic emission probe contacts the rock sample; set the confining pressure parameters in each direction, and perform loading through the X-axis hydraulic cylinder, the Y-axis hydraulic cylinder, and the Z-axis hydraulic cylinder respectively; obtain the pressure applied to the rock sample to be tested by the hydraulic loading system through the pressure sensor, so that the pressure in each direction reaches the set surrounding rock pressure.

[0026] S2. Start the power control system, and adjust the cross plate so that the microwave transmitter reaches the optimal distance from the surface of the rock sample to be tested.

[0027] S3. Turn on the microwave generating device, start the program after setting the microwave parameters required for the test, turn on the microwave emitter, and start microwave radiation heating on the surface of the rock sample to be tested, causing heat damage to the rock sample. At the same time, turn on the acoustic emission positioning system and the infrared thermal imaging probe to monitor and collect information such as the generation of cracks in the rock sample to be tested and the temperature of the heated surface. All information will be fed back to the data acquisition system;

[0028] S4. After the microwave heating is completed, turn off the microwave generating device, the microwave emitter, and the infrared thermal imaging probe;

[0029] S5. Move the cross plate through the power control system, penetrate the hob into the rock sample to be tested, and the extrusion force of the hob on the rock sample to be tested is obtained through the pressure sensor and fed back to the data acquisition system;

[0030] S6. Turn on the hob control system, start the hob disc drive motor to rotate the hob disc frame after setting the required rock-breaking parameters, and start the hob rock-breaking test. The hob trajectory is circular to achieve repeated cutting and destruction on the same trajectory; the parameters of the power control system can be set as needed to make the penetration degree meet the requirements; during the test, the generation of cracks is collected and transmitted through the acoustic emission positioning system;

[0031] S7. After the test is completed, save the test data.

[0032] Compared with the prior art, the beneficial features of the present invention are as follows:

[0033] 1. The present invention can simulate the microwave heating and hob cutting tests of rocks under the true triaxial stress state.

[0034] 2. The present invention can simulate the true triaxial stress state, and the side lining plate and the bottom lining plate are independently controlled to achieve the combination of different stresses in different directions.

[0035] 3. The present invention can simulate the hob cutting rock-breaking with a circular trajectory, and by adjusting the hob radius, the rock-breaking effects of different trajectories and different spacings can be achieved.

[0036] 4. The present invention can monitor the temperature of the heated surface of the rock sample to be tested through the infrared thermal imaging probe, and the acoustic emission device can locate the generation and position of cracks in the rock sample to be tested, and the whole process information of the rock sample to be tested under the microwave heating and hob cutting tests can be obtained. Description of the Drawings

[0037] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0038] Figure 1 Schematic diagram of the structure of the microwave-assisted rock-breaking device under the true triaxial conditions of the invention;

[0039] Figure 2 Stereogram of the main body in the microwave-assisted rock-breaking device under the true triaxial conditions of the invention;

[0040] Figure 3a Acoustic emission layout diagram in the microwave-assisted rock-breaking device under the true triaxial conditions of the invention;

[0041] Figure 3b For Figure 3a Partial enlarged view of;

[0042] Figure 4 Specimen chamber layout diagram in the microwave-assisted rock-breaking device under the true triaxial conditions of the invention;

[0043] Figure 5 Layout diagram of infrared thermal imaging probes and microwave transmitters in the microwave-assisted rock-breaking device under the true triaxial conditions of the invention;

[0044] Figure 6 Hob layout diagram in the microwave-assisted rock-breaking device under the true triaxial conditions of the invention.

[0045] Reference numerals: 1, power control system; 2, piston rod of telescopic hydraulic cylinder; 3, cross plate; 4, waveguide; 5, microwave generating device; 6, acoustic emission host; 7, acoustic emission display device; 8, preamplifier; 9-1, piston rod of Y-axis hydraulic cylinder; 9-2, piston rod of X-axis hydraulic cylinder; 9-3, piston rod of Z-axis hydraulic cylinder; 10, guide rod; 11-1, X-axis hydraulic cylinder; 11-2, Y-axis hydraulic cylinder; 11-3, Z-axis hydraulic cylinder; 12, microwave transmitter; 13, hob; 14, infrared thermal imaging probe; 15, cavity plate; 16, lining plate; 17, true triaxial control device; 18, acoustic emission probe; 19, soft gasket; 20, spring; 21, base; 22, hob disc holder; 23, robotic arm; 24, vertical frame; 25, hob disc drive motor; 26, bracket; 27, rotary bearing; 28, pressure sensor; 29, data acquisition system; 30, hob mounting hole 31, acoustic emission probe reserved hole. Detailed implementation manners

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will describe the technical solutions in the embodiments of the present invention clearly and completely in conjunction with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0047] As Figures 1 - 6 A true triaxial condition microwave-assisted rock-breaking device of the present invention includes an operating table, a hob rock-breaking system, a microwave radiation heating system, an infrared thermal imaging probe, a hydraulic loading system, an acoustic emission positioning system, and a data acquisition system.

[0048] The power control system 1 is internally provided with a pressure sensor, a data information collection module, etc.; the cross plate 3 is embedded on the guide rod 10 and is connected to the piston rod 2 of the telescopic hydraulic cylinder on the power control system 1, and can move up and down along the guide rod 10 through the power output of the power control system 1.

[0049] The hydraulic loading system includes an X-axis hydraulic cylinder 11-1, a Y-axis hydraulic cylinder 11-2, and a Z-axis hydraulic cylinder 11-3, which are respectively located in the X-axis, Y-axis, and Z-axis directions of the specimen chamber; the X-axis hydraulic cylinder 11-1, the Y-axis hydraulic cylinder 11-2, and the Z-axis hydraulic cylinder 11-3 are all connected to the corresponding cavity plate 15 and the lining plate 16 through the hydraulic cylinder piston rod. Among them, the X-axis hydraulic cylinder 11-1, the Y-axis hydraulic cylinder 11-2, and the Z-axis hydraulic cylinder 11-3 are respectively connected to the true triaxial control device 17.

[0050] The hob rock-breaking system includes a hob 13, a hob disc frame 22, a hob disc drive motor 25, a pressure sensor 28, etc.; the circular hob disc frame 22 is connected below the cross plate 3 through a rotary bearing 27 and can be rotated 360 degrees through the control of the hob disc drive motor 25; the hob 13 is installed under the hob disc frame 22, with a total of 4 groups, distributed in a "cross" shape, fixed by bolts, and the center is at the center of the circle of the hob disc frame 22. A plurality of sets of hob mounting holes 30 are provided on the hob disc frame 22, which are suitable for matching different radius hob combinations.

[0051] The specimen chamber is a cavity, including a cavity plate 15 and a lining plate 16; an acoustic emission probe reserved hole 31 is provided on the lining plate, and an acoustic emission probe 18 is installed in the acoustic emission probe reserved hole 31; the rock sample is placed in this cavity, and the upper side is open in the Z direction; the lining plate 16 adopts a "rotating windmill shape" design, that is, the lining plate adopts a misaligned placement method, as Figure 4 shown.

[0052] The microwave radiation heating system includes a microwave generating device 5, a waveguide 4, and a microwave emitter 12; the microwave emitter 12 is fixed to a vertical frame 24 at the center below the cross plate 3 of the true triaxial test device by bolts, and the microwave emitter 12 can be folded upward; the distance between the rock sample and the microwave emitter 12 is adjusted by the up and down movement of the cross plate 3 to ensure the optimal irradiation distance; the microwave generating device 5 is connected to the microwave emitter 12 through the waveguide 4 for microwave transmission.

[0053] The infrared thermal imaging probe 14 is installed at the bottom of the robotic arm 23, and the top of the robotic arm is fixed to the vertical frame 24 of the microwave emitter 12. The robotic arm 23 can be folded up and down.

[0054] The acoustic emission positioning system consists of an acoustic emission display device 7, an acoustic emission host 6, a preamplifier 8, and an acoustic emission probe 18; the acoustic emission preamplifier 8 can provide gains at different decibel levels; acoustic emission probe reserved holes 31 are provided on the lining plate 16 in the sample chamber, and the acoustic emission probe 18 is installed in the acoustic emission probe reserved holes 31. A soft cushion ring is used to separate the spring 20 from the acoustic emission probe 18 to reduce the loss of the acoustic emission probe 18, as Figure 3a shown; the acoustic emission display device 7, the acoustic emission host 6, the preamplifier 8, and the acoustic emission probe 18 are connected by data lines.

[0055] The data acquisition system 29 is respectively connected to the power control system, the hydraulic loading system, the hob rock breaking system, the microwave radiation heating system, the infrared thermal imaging probe, and the acoustic emission positioning system. Specifically, the data acquisition system 29 is respectively connected to the power control system 1, the true triaxial control device 17, the hob drive motor 25, the microwave generating device 5, the infrared thermal imaging probe 14, and the acoustic emission probe 18, and is used to obtain data such as pressure, rotation speed, infrared thermal imaging, and acoustic emission, and to control the hydraulic loading, hob penetration, etc.

[0056] The following describes the microwave-assisted rock breaking test method under true triaxial conditions with reference to the accompanying drawings, including the following steps:

[0057] S1. Place the rock sample to be tested into the sample chamber on the base 21, adjust the position, and apply a coupling agent to the surface of the area where the acoustic emission probe 18 contacts the rock sample; set the confining pressure parameters in each direction, and perform loading through the X-axis hydraulic cylinder 11-1, Y-axis hydraulic cylinder 11-2, and Z-axis hydraulic cylinder 11-3 of the hydraulic loading system; obtain the pressure applied to the rock sample to be tested by each X-axis hydraulic cylinder 11-1, Y-axis hydraulic cylinder 11-2, and Z-axis hydraulic cylinder 11-3 through the pressure sensors, so that the pressure in each direction reaches the set surrounding rock pressure. When the pressure is applied, the acoustic emission probe 18 can be in close contact with the rock sample under the extrusion of the spring 20.

[0058] S2. Start the power control system 1, adjust the required angle between the robotic arm 23 on the microwave transmitter 12 and the rock sample to be tested, and then adjust the cross plate 3 so that the microwave transmitter 12 reaches the optimal distance from the surface of the rock sample to be tested.

[0059] S3. Turn on the microwave generating device 5, start the program after setting the microwave parameters required for the test, turn on the microwave transmitter 12, and start microwave radiation heating on the surface of the rock sample to be tested to heat-damage the rock sample. At the same time, turn on the acoustic emission positioning device and the infrared thermal imaging probe to monitor and collect information such as the generation of cracks in the rock sample to be tested and the temperature of the heated surface. All information will be fed back to the data acquisition system 29.

[0060] S4. After the microwave heating is completed, turn off the microwave generating device 5, the microwave transmitter 12, and the infrared thermal imaging probe, and then fold the microwave transmitter 12 and the infrared thermal imaging probe 14 upwards in sequence to provide a certain degree of protection for the microwave transmitter 12 and the infrared thermal imaging probe 14.

[0061] S5. Move the cross plate 3 through the power control system 1, penetrate the hob 13 into the rock sample to be tested, and the extrusion force of the hob 13 on the rock sample to be tested is obtained through the pressure sensor 28 and fed back to the data acquisition system 29.

[0062] S6. Turn on the hob control system, start the hob disc drive motor 25 to rotate the hob disc frame 22 after setting the required rock-breaking parameters, and start the hob rock-breaking test. The hob trajectory is circular to achieve repeated cutting and destruction on the same trajectory; the parameters of the power control system 1 can be set as needed to make the penetration degree meet the requirements; during the test, the generation of cracks is collected and transmitted through the acoustic emission positioning device. By adjusting the position of the hob 13 at the same time, the hob rock-breaking effect with different trajectories can be achieved; or the four hobs can be adjusted to be at different radii to achieve the hob rock-breaking with the multi-knife effect at different spacings.

[0063] S7. After the test is completed, save the test data, turn off the hob rock-breaking system and the acoustic emission positioning system, move the cross plate 3 upwards through the power control system 1; remove the confining pressure through the hydraulic loading system, then take out the rock sample to be tested, turn off the power supply of the test system and clean the sample chamber.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A microwave-assisted rock breaking device under true triaxial conditions, characterized in that: It includes: Operating table, rock-breaking system with roller cutter, microwave radiation heating system, infrared thermal imaging probe, hydraulic loading system, acoustic emission positioning system and data acquisition system; The operating table includes a base and a sample chamber; the sample chamber is installed on the base; a guide rod is provided on the base; a liftable horizontal plate is provided on the guide rod; a power control system is fixedly installed on the top of the guide rod; a telescopic hydraulic cylinder piston rod of the power control system is connected to the horizontal plate; The cutter rock breaking system comprises a cutter disc frame and a cutter disc drive motor; the cutter disc frame is mounted on the horizontal plate through a rotary bearing and faces the sample chamber; a cutter is arranged on the cutter disc frame; the cutter disc drive motor is fixedly mounted on the horizontal plate; a drive shaft of the cutter disc drive motor is connected to a rotating shaft of the cutter disc frame; The microwave radiation heating system comprises a microwave generating device, a waveguide and a microwave emitter; the microwave emitter is installed on the transverse plate and faces the sample chamber; the microwave emitter is connected to the microwave generating device through the waveguide; The infrared thermal imaging probe is fixedly mounted on the horizontal plate; The hydraulic loading system includes an X-axis hydraulic cylinder, a Y-axis hydraulic cylinder, a Z-axis hydraulic cylinder and a true three-axis control device; the sample chamber is divided into two layers, the inner and outer layers; the inner layer is surrounded by five lining plates to form a cavity structure; the outer layer is surrounded by four cavity plates; the X-axis hydraulic cylinder and the Y-axis hydraulic cylinder are respectively fixedly installed on the cavity plates, and their hydraulic cylinder piston rods are respectively connected to the lining plates in corresponding directions; the Z-axis hydraulic cylinder is fixedly installed on the base, and its hydraulic cylinder piston rod is connected to the lining plate at the bottom; The four lining plates in the X-axis and Y-axis directions are staggeredly distributed in a rotating windmill shape; The acoustic emission positioning system comprises an acoustic emission display device, an acoustic emission host, a preamplifier and an acoustic emission probe; the acoustic emission probe is fixedly mounted on the lining plate; the acoustic emission display device, the acoustic emission host, the preamplifier and the acoustic emission probe are communicatively connected; The roller cutter rock breaking system, the microwave radiation heating system, the infrared thermal imaging probe, the hydraulic loading system and the acoustic emission positioning system are all communicatively connected with the data acquisition system.

2. The microwave-assisted rock breaking device under true triaxial conditions according to claim 1, characterized in that: The cutter disc frame is provided with 4 groups of cutters, which are distributed in a cross shape.

3. The microwave-assisted rock breaking device under true triaxial conditions according to claim 1 is characterized in that: The hob cutter disc frame is provided with a plurality of hob cutter mounting holes with different diameters.

4. The microwave-assisted rock breaking device under true triaxial conditions according to claim 1, characterized in that: A vertical frame is arranged at the center below the horizontal plate; the vertical frame is divided into two sections, which are hinged; and the microwave transmitter is fixedly installed at the other end of the vertical frame.

5. The microwave-assisted rock breaking device under true triaxial conditions according to claim 4 is characterized in that: The infrared thermal imaging probe is installed on the vertical frame through a mechanical arm.

6. The microwave-assisted rock breaking device under true triaxial conditions according to claim 1, characterized in that: The lining plate is provided with a reserved hole for an acoustic emission probe; a spring is provided in the reserved hole for the acoustic emission probe; the acoustic emission probe is installed in the reserved hole for the acoustic emission probe and is located at the front end of the spring.

7. The microwave-assisted rock breaking device under true triaxial conditions according to claim 6, characterized in that: A soft washer is arranged between the acoustic emission probe and the spring.

8. The microwave-assisted rock breaking device under true triaxial conditions according to claim 1, characterized in that: A pressure sensor is provided at the position where the hob is mounted on the hob cutter disc frame.

9. A test method, characterized in that The microwave-assisted rock breaking device under true triaxial conditions as claimed in any one of claims 1 to 8 is used for testing, and the test steps include: S1. Place the rock sample to be tested into the inner layer of the sample bin, adjust the position, and apply coupling agent on the surface of the area where the acoustic emission probe contacts the rock sample; set the confining pressure parameters in each direction, and load the rock sample through the X-axis hydraulic cylinder, the Y-axis hydraulic cylinder, and the Z-axis hydraulic cylinder respectively; obtain the pressure applied by the hydraulic loading system to the rock sample to be tested through the pressure sensor, so that the pressure in each direction reaches the set surrounding rock pressure; S2, starting the power control system and adjusting the horizontal plate so that the microwave transmitter reaches an optimal distance from the surface of the rock sample to be tested; S3, turn on the microwave generating device, set the microwave parameters required for the test and then start the program, turn on the microwave transmitter, start to heat the surface of the rock sample to be tested with microwave radiation, so that the rock sample is damaged by heat, and at the same time turn on the acoustic emission positioning system and the infrared thermal imaging probe to monitor and collect the crack generation of the rock sample to be tested and the temperature information of the heated surface, and all the information will be fed back to the data acquisition system; S4, after the microwave heating is completed, turning off the microwave generating device, the microwave transmitter and the infrared thermal imaging probe; S5, moving the horizontal plate through the power control system to penetrate the roller cutter into the rock sample to be tested, and obtaining the squeezing force of the roller cutter on the rock sample to be tested through a pressure sensor and feeding it back to the data acquisition system; S6, start the cutter control system, set the required rock breaking parameters, start the cutter disc drive motor to rotate the cutter disc frame, and start the cutter rock breaking test. The cutter track is circular, and repeated cutting and destruction are achieved on the same track; the parameters of the power control system are set as needed so that the penetration meets the requirements; the generation of cracks during the test is collected and transmitted by the acoustic emission positioning system; S7. After the test is completed, save the test data.

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