Microwave-assisted rock breaking device under true triaxial condition and test method

Abstract

The invention provides a microwave-assisted rock breaking device under a true triaxial condition and a test method, and belongs to the technical field of rock mass mechanics. The microwave-assisted rock breaking device under the true triaxial condition comprises 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 an experiment, a sample is placed on an operation table, and microwave heating and hob cutting tests can be carried out. According to the invention, the problem that the rock sample is subjected to microwave radiation heating under true triaxial stress and then is subjected to rock breaking by using a disc type cutting machine can be solved, so that the mechanical response and the damage mechanism in the rock breaking process are disclosed.

Description

Technical Field

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

[0002] As we continue to advance deeper into the earth, traditional mechanical rock breaking devices are still the main force in rock breaking. However, when encountering high-strength hard rocks, traditional mechanical rock breaking has problems such as low rock breaking efficiency, cutter head wear, large maintenance volume, and increased costs, which seriously affect the rock breaking efficiency. Microwave-assisted rock breaking is an emerging hybrid rock breaking method that combines microwave heating technology with mechanical rock breaking technology. Microwaves are used to heat the rock mass, causing it to crack and reduce the strength of the rock mass, thereby reducing the wear of the cutter head of the mechanical rock breaking and improving the rock breaking efficiency.

[0003] In terms of microwave-assisted rock breaking under true triaxial conditions, the domestic patents related to the present invention have certain invention achievements and innovations, but at the same time, they also have more or less problems. On the one hand, the existing technologies in microwave-assisted rock breaking systems mostly only prove the feasibility of microwave-assisted rock breaking, and lack roller cutter tests under confining pressure. The Chinese patent application "A microwave water jet collaborative rock breaking method and device" with application number "202010779133.9" provides a microwave + water jet combined rock breaking system, but no corresponding roller cutter test was conducted. The Chinese patent application "A microwave rock breaking system and its use method" with application number "202210433340.8" provides a microwave rock breaking system and its use method, but also lacks corresponding roller cutter tests. The Chinese patent application "A microwave rock breaking thermal damage and radon release real-time monitoring test device and method" with application number "202310782020.8" provides a microwave rock breaking thermal damage and radon release real-time monitoring test device, and monitors the test by means of distributed optical fiber demodulator and resistivity test, but also does not conduct a roller test. On the other hand, the existing theoretical test needs to be improved in terms of monitoring the acquisition of information on the entire rock breaking process, and it is difficult to accurately reveal the rock breaking mechanism. The Chinese patent application "A microwave-assisted rock breaking test device" with application number "202221115091.X" provides a microwave-assisted rock breaking test device and conducts a roller test, but lacks corresponding monitoring means. The Chinese patent application "A TBM roller rock breaking test device and method under simulated deep conditions" with application number "202310213745.5" provides a TBM roller rock breaking test device and method under simulated deep conditions, using microwave heating + liquid nitrogen cooling to process rock samples, and then conducting a roller test, but also lacks corresponding monitoring means. The Chinese patent application "A Microwave-Assisted TBM Cutter Rock Breaking Test Device" with application number "202010608006.2" provides a microwave-assisted TBM cutter rock breaking test device, which can conduct a TBM cutter rock breaking test under the action of microwaves, but the monitoring means only include a temperature measuring device and does not simulate the situation of confining pressure. In addition, in the cutter test, the rock breaking trajectory is mostly linear, which is inconsistent with the circular trajectory of the TBM shield machine when breaking rock.

[0004] It can be seen that there is currently a lack of a device to simulate microwave-assisted rock breaking under confining pressure and the monitoring of related information, so as to reveal the mechanical response and failure mechanism of the rock breaking process. Summary of the invention

[0005] In order to solve the problems mentioned in the background technology, the present invention provides a microwave-assisted rock breaking device under true triaxial stress to solve the problem of breaking the rock with a disc cutter after heating the rock sample with microwave radiation under true triaxial stress, thereby revealing the mechanical response and destruction mechanism of the rock breaking process.

[0006] Specifically: A microwave-assisted rock-breaking device under true triaxial conditions, comprising: an operating table, a roller 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; 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 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.

[0007] Furthermore, the cutter disc frame is provided with 4 groups of cutters, which are distributed in a cross shape.

[0008] Furthermore, the cutter disc frame is provided with a plurality of cutter mounting holes of different diameters. A plurality of sets of cutter mounting holes are provided on the cutter disc frame, and a combination of cutters of different radii can be matched.

[0009] Furthermore, the four lining plates in the X-axis and Y-axis directions are staggeredly distributed in a rotating windmill shape.

[0010] At present, in true triaxial tests, most rigid loading methods are used (similar to the loading method in the present invention). However, the rigid loading method has a major defect, that is, the compression deformation of the specimen during the loading process often leads to the extrusion of the liner. The traditional practice is to leave a gap between the vertical and horizontal liners. However, the existence of this gap will lead to obvious boundary effects of the specimen, resulting in uneven stress and deformation during the test, resulting in abnormal specimen failure morphology. In order to avoid abnormal rock fracture morphology under true triaxial test caused by this defect, the liner of the true triaxial specimen chamber in the present invention adopts a "rotating windmill-shaped" design, and the liner adopts a staggered placement method.

[0011] Furthermore, a vertical frame is provided 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.

[0012] Furthermore, the infrared thermal imaging probe is installed on the vertical frame through a mechanical arm.

[0013] Furthermore, 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.

[0014] Furthermore, a soft washer is provided between the acoustic emission probe and the spring.

[0015] Furthermore, a pressure sensor is provided at a position of the cutter disc frame where the cutter is mounted.

[0016] The present invention also provides a test method, which uses the microwave-assisted rock breaking device under the true triaxial condition to conduct a test, 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 information such as the generation of cracks in the rock sample to be tested and the temperature of the heated surface, and all 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 can be set as needed so that the penetration meets the needs. 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.

[0017] Compared with the prior art, the present invention has the following beneficial features: 1. The present invention can simulate microwave heating and hob cutting tests of rocks under true triaxial stress state.

[0018] 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.

[0019] 3. The present invention can simulate the circular trajectory of the roller cutter to cut and break rocks, and the roller cutter radius can be adjusted to achieve rock breaking effects with different trajectories and different spacings.

[0020] 4. The present invention can monitor the temperature of the heated surface of the rock sample to be tested by an infrared thermal imaging probe, and locate the generation and position of cracks in the rock sample to be tested by an acoustic emission device, so as to obtain the whole process information of the rock sample to be tested under microwave heating and hob cutting test. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0022] Figure 1A schematic diagram of the structure of the microwave-assisted rock breaking device under true triaxial conditions; Figure 2 A stereoscopic diagram of the main body of the microwave-assisted rock breaking device under true triaxial conditions; Figure 3a The acoustic emission arrangement diagram of the microwave-assisted rock breaking device under the true triaxial condition of the invention; Figure 3b for Figure 3a A partial enlarged view of Figure 4 The sample chamber layout diagram of the microwave-assisted rock breaking device under true triaxial conditions invented; Figure 5 The layout diagram of the infrared thermal imaging probe and microwave transmitter of the invented microwave-assisted rock breaking device under true triaxial conditions; Figure 6 This is a diagram of the arrangement of the roller cutters in the microwave-assisted rock breaking device under true triaxial conditions.

[0023] Figure numerals: 1, power control system; 2, telescopic hydraulic cylinder piston rod; 3, cross plate; 4, waveguide; 5, microwave generating device; 6, acoustic emission host; 7, acoustic emission display device; 8, preamplifier; 9-1, Y-axis hydraulic cylinder piston rod; 9-2, X-axis hydraulic cylinder piston rod; 9-3, Z-axis hydraulic cylinder piston rod; 10, guide rod; 11-1, X-axis hydraulic cylinder; 11-2, Y-axis hydraulic cylinder; 11-3, Z-axis hydraulic cylinder; 12, microwave generating device emitter; 13. hob; 14. infrared thermal imaging probe; 15. cavity plate; 16. lining plate; 17. true three-axis control device; 18. acoustic emission probe; 19. soft gasket; 20. spring; 21. base; 22. hob frame; 23. mechanical arm; 24. vertical frame; 25. hob drive motor; 26. bracket; 27. rotating bearing; 28. pressure sensor; 29. ​​data acquisition system; 30. hob mounting hole 31. acoustic emission probe reserved hole. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] like Figure 1-Figure 6 The invention discloses a microwave-assisted rock-breaking device under true triaxial conditions, comprising an operating table, a roller 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.

[0026] The power control system 1 has built-in pressure sensors, data information collection modules, etc.; the cross plate 3 is embedded in the guide rod 10 and connected to the telescopic hydraulic cylinder piston rod 2 on the power control system 1. It can move up and down along the guide rod 10 through the power output of the power control system 1.

[0027] 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 sample chamber; the X-axis hydraulic cylinder 11-1, the Y-axis hydraulic cylinder 11-2, and the Z-axis hydraulic cylinder 11-3 are 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 three-axis control device 17.

[0028] The cutter rock breaking system includes a cutter 13, a cutter disc frame 22, a cutter disc drive motor 25 and a pressure sensor 28. The circular cutter disc frame 22 is connected to the bottom of the cross plate 3 through a rotary bearing 27, and can be controlled by the cutter disc drive motor 25 to achieve 360-degree rotation. The cutters 13 are installed under the cutter disc frame 22, and there are 4 groups in total, which are distributed in a "cross shape" and fixed by bolts, with the center at the center of the cutter disc frame 22. A plurality of sets of cutter mounting holes 30 are opened on the cutter disc frame 22, which are suitable for matching cutter combinations with different radii.

[0029] The sample chamber is a cavity, including a cavity plate 15 and a lining plate 16; the lining plate is provided with an acoustic emission probe reserved hole 31, in which an acoustic emission probe 18 is installed; the cavity is used to place rock samples, and the upper side is open in the Z direction; the lining plate 16 adopts a "rotating windmill-shaped" design, that is, the lining plate is placed in a staggered manner, such as Figure 4 shown.

[0030] The microwave radiation heating system comprises a microwave generating device 5, a waveguide tube 4 and a microwave emitter 12; the microwave emitter 12 is fixed to a vertical frame 24 at the center below the horizontal 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 moving the horizontal plate 3 up and down to ensure the optimal irradiation distance; the microwave generating device 5 and the microwave emitter 12 are connected by the waveguide tube 4 to transmit microwaves.

[0031] The infrared thermal imaging probe 14 is installed at the bottom of the mechanical arm 23, the top of the mechanical arm is fixed on the vertical frame 24 of the microwave transmitter 12, and the mechanical arm 23 can be folded up and down.

[0032] The acoustic emission positioning system is composed 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 of different decibels; an acoustic emission probe reserved hole 31 is opened on the lining plate 16 in the sample chamber, and the acoustic emission probe 18 is installed in the acoustic emission probe reserved hole 31. The spring 20 and the acoustic emission probe 18 are separated by a soft gasket to reduce the loss of the acoustic emission probe 18. Figure 3a As shown; the acoustic emission display device 7, the acoustic emission host 6, the preamplifier 8 and the acoustic emission probe 18 are connected via a data line.

[0033] The data acquisition system 29 is respectively connected to the power control system, the hydraulic loading system, the roller cutter 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 three-axis control device 17, the roller cutter 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 control hydraulic loading, roller cutter penetration, etc.

[0034] The microwave-assisted rock breaking test method under true triaxial conditions is described below with reference to the accompanying drawings, including the following steps: S1. Place the rock sample to be tested in the sample chamber on the base 21, adjust the position, and apply coupling agent on the surface of the area where the acoustic emission probe 18 contacts the rock sample; set the confining pressure parameters in each direction, and load 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 by each X-axis hydraulic cylinder 11-1, Y-axis hydraulic cylinder 11-2, and Z-axis hydraulic cylinder 11-3 through the pressure sensor, so that the pressure in each direction reaches the set surrounding rock pressure. When the pressure is applied, the acoustic emission probe 18 and the rock sample can be in close contact under the squeezing action of the spring 20.

[0035] S2, start the power control system 1, adjust the required angle between the mechanical 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 and the surface of the rock sample to be tested reach the optimal distance.

[0036] S3, turn on the microwave generating device 5, set the microwave parameters required for the test and start the program, turn on the microwave transmitter 12, start to heat the surface of the rock sample with microwave radiation to cause the rock sample to be damaged by heat, and 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 and the temperature of the heated surface. All information will be fed back to the data acquisition system 29.

[0037] S4. After the microwave heating is completed, the microwave generating device 5, the microwave transmitter 12 and the infrared thermal imaging probe are turned off, and then the microwave transmitter 12 and the infrared thermal imaging probe 14 are folded upward in sequence to provide certain protection for the microwave transmitter 12 and the infrared thermal imaging probe 14.

[0038] S5. Move the horizontal plate 3 through the power control system 1 to penetrate the roller cutter 13 into the rock sample to be tested. The squeezing force of the roller cutter 13 on the rock sample to be tested is obtained through the pressure sensor 28 and fed back to the data acquisition system 29.

[0039] S6. Turn on the cutter control system, set the required rock breaking parameters, start the cutter drive motor 25 to rotate the cutter frame 22, and start the cutter rock breaking test. The cutter track is circular, and repeated cutting and destruction on the same track can be achieved; the parameters of the power control system 1 can be set as needed so that the penetration meets the needs; the generation of cracks during the test is collected and transmitted by the acoustic emission positioning device. By adjusting the position of the cutter 13 at the same time, the rock breaking effect of the cutter with different tracks can be achieved; the four cutters can also be adjusted to different radii to achieve rock breaking with multiple cutters at different spacings.

[0040] S7. After the test is completed, save the test data, turn off the roller cutter rock breaking system, turn off the acoustic emission positioning system, move the cross plate 3 upward 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 of the test system and clean the sample bin.

[0041] 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 it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, 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 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: The four lining plates in the X-axis and Y-axis directions are staggeredly distributed in a rotating windmill shape.

5. 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.

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

7. 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.

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

9. 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.

10. 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 9 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 information such as the generation of cracks in the rock sample to be tested and the temperature of the heated surface, and all 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 can be set as needed so that the penetration meets the needs. 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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