In-situ testing equipment for mechanical parameters of coal rock

Abstract

The invention discloses coal rock mechanical parameter in-situ testing equipment which comprises an end fixing seat, and a first three-axis driving mechanism is arranged in the end fixing seat; the output end of the first three-axis driving mechanism is connected with one end of a first telescopic arm, one end of a second telescopic arm and one end of a third telescopic arm, the other end of the first telescopic arm is provided with a first fixing end, and the other end of the second telescopic arm is provided with a second fixing end. And a normal stress fixing seat is arranged at the other end of the third telescopic arm. According to the invention, on-site in-situ test can be carried out according to actual needs, a standard sample does not need to be manufactured, the accuracy of a test result is ensured, and the test process is simpler and easier to operate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rock mechanics parameter testing, and particularly relates to a coal rock mechanics parameter in-situ testing device. BACKGROUND

[0002] Coal rock mechanics is a branch of rock mechanics, and is mainly applied to solving rock engineering problems in the mining industry.

[0003] Coal rock mechanics parameter testing refers to experiments and measurements of some mechanical properties of coal rock, so as to better understand the mechanical behavior and engineering properties of the coal rock. Coal rock mechanics parameters mainly include compressive strength, shear strength, elastic modulus, Poisson's ratio and the like. Existing methods for measuring coal rock mechanics parameters include a direct method and an indirect method, and related testing devices include a uniaxial compression tester, a biaxial compression tester, a point load tester, a rebound tester and the like.

[0004] The direct method for measuring coal rock parameters is widely used in the industry, and the direct method for measuring coal rock strength includes a triaxial compression test and a uniaxial compression test, and the like. The direct method for measuring coal rock strength inevitably uses standard samples. If there is no standard sample, the standard sample needs to be prepared, and standard instruments and procedures need to be used in the experiment, which is relatively troublesome.

[0005] The indirect method for measuring coal rock parameters usually infers the strength of the coal rock by observing and measuring some specific properties or behaviors of the coal rock. Frequently used instruments include a rebound tester and a point load tester. The indirect method for measuring rock parameters has low requirements for standard samples, but the data is relatively discrete.

[0006] Whether the direct method or the indirect method for measuring coal rock mechanics parameters, the process is relatively complex, and the practicality of the experimental data obtained is reduced compared with in-situ testing.

[0007] Therefore, it is an urgent technical problem in the field of coal rock mechanics to design a coal rock mechanics parameter in-situ testing device. SUMMARY

[0008] In order to overcome the above problems, the purpose of the present application is to provide a coal rock mechanics parameter in-situ testing device, which can perform in-situ testing on site according to actual needs, without the need to prepare standard samples, and ensure the accuracy of the test results, and the test process is more simple and easy to operate.

[0009] In order to achieve the above purposes, the technical scheme adopted by the present application is as follows: a coal rock mechanics parameter in-situ testing device, comprising a end head fixing seat, a first triaxial driving mechanism is arranged in the end head fixing seat;

[0010] The output end of the first three-axis drive mechanism is respectively connected to one end of the first telescopic arm, one end of the second telescopic arm and one end of the third telescopic arm. The other end of the first telescopic arm is provided with a first fixed end, the other end of the second telescopic arm is provided with a second fixed end, and the other end of the third telescopic arm is provided with a normal stress fixing seat.

[0011] The normal stress fixing seat is provided with a second three-axis drive mechanism;

[0012] The output ends of the second and third axis drive mechanisms are respectively connected to one end of the fourth telescopic arm, one end of the fifth telescopic arm and one end of the sixth telescopic arm. The other end of the fourth telescopic arm is provided with a first normal stress loading end, the other end of the fifth telescopic arm is provided with a second normal stress loading end, and the other end of the sixth telescopic arm is provided with a shear stress fixing seat.

[0013] The shear stress fixing seat is equipped with a two-axis drive mechanism.

[0014] The output ends of the two-axis drive mechanism are respectively connected to one end of the seventh telescopic arm and one end of the eighth telescopic arm. The other end of the seventh telescopic arm is provided with a first shear stress fixing seat, and the other end of the eighth telescopic arm is provided with a second shear stress fixing seat.

[0015] The first shear stress fixing seat is provided with a first single-axis drive mechanism. The output end of the first single-axis drive mechanism is connected to one end of the ninth telescopic arm. The other end of the ninth telescopic arm is provided with a first shear stress loading end.

[0016] The second shear stress fixing seat is provided with a second single-axis drive mechanism. The output end of the second single-axis drive mechanism is connected to one end of the tenth telescopic arm. The other end of the tenth telescopic arm is provided with a second shear stress loading end.

[0017] The first three-axis drive mechanism, the second three-axis drive mechanism, the two-axis drive mechanism, the first single-axis drive mechanism, and the second single-axis drive mechanism are all communicatively connected to the PC control terminal of the peripheral device;

[0018] The first normal stress loading end, the second normal stress loading end, the first shear stress loading end, and the second shear stress loading end simultaneously apply normal stress and shear stress to the rock wall under test, respectively. The obtained normal stress and shear stress data are expressed by formula... Calculate the required mechanical parameter test data;

[0019] Where τ is the shear stress of the rock, and c is the cohesion of the rock. Let σ be the internal friction angle of the rock, and σ be the normal stress of the rock.

[0020] The first and second fixed ends are embedded in the designated rock wall to fix the position of the device. Then, normal stress and shear stress are simultaneously applied to the designated rock wall through the first normal stress loading end, the second normal stress loading end, the first shear stress loading end, and the second shear stress loading end until the rock wall fails. The data of normal stress and shear stress at the time of rock wall failure are recorded. By applying different magnitudes of normal stress and shear stress, multiple sets of data are obtained. Finally, the required data are calculated by formula through the PC control terminal, thus achieving the purpose of in-situ testing.

[0021] Preferably, a first fixed seat is provided between the fourth telescopic arm and the first normal stress loading end, and a second fixed seat is provided between the fifth telescopic arm and the second normal stress loading end. The first fixed seat and the second fixed seat respectively play a role in stabilizing the first normal stress loading end and the second normal stress loading end.

[0022] Preferably, the first fixing base is provided with a first normal stress data collector connected to the first normal stress loading end, and the second fixing base is provided with a second normal stress data collector connected to the second normal stress loading end.

[0023] Preferably, a first normal stress sensor is disposed inside the first normal stress loading end, and a second normal stress sensor is disposed inside the second normal stress loading end; the first normal stress data collector receives data from the first normal stress sensor, and the second normal stress data collector receives data from the second normal stress sensor.

[0024] Preferably, the normal stress fixing seat is provided with a normal stress data transmission device, which transmits the data collected by the first normal stress data collector and the second normal stress data collector to the PC control terminal.

[0025] Preferably, a third fixing seat is provided between the ninth telescopic arm and the first shear stress loading end, and a fourth fixing seat is provided between the tenth telescopic arm and the second shear stress loading end. The third fixing seat and the fourth fixing seat respectively play a role in stabilizing the first shear stress loading end and the first shear stress loading end.

[0026] Preferably, the third fixing seat is provided with a first shear stress data collector connected to the first shear stress loading end, and the fourth fixing seat is provided with a second shear stress data collector connected to the second shear stress loading end.

[0027] Preferably, a first shear stress sensor is disposed in the first shear stress loading end, and a second shear stress sensor is disposed in the second shear stress loading end; the first shear stress data collector receives data from the first shear stress sensor, and the second shear stress data collector receives data from the second shear stress sensor.

[0028] Preferably, the shear stress fixing seat is provided with a shear stress data transmission device, which transmits the data collected by the first shear stress data collector and the second shear stress data collector to the PC control terminal.

[0029] Preferably, a first downhole probe is installed inside the normal stress fixing seat, and a second downhole probe is installed inside the shear stress fixing seat.

[0030] The beneficial effects of this invention are: the device can be fixed at a designated position by a fixed end, and then normal stress and shear stress are applied to a designated rock wall simultaneously until the rock wall fails. The data of normal stress and shear stress at the time of rock wall failure are recorded. Multiple sets of data can be obtained by applying different magnitudes of normal stress and shear stress. The required data can be calculated by a PC control terminal and formulas to achieve the purpose of in-situ testing. Furthermore, the device can be adapted to different working environments by extending each telescopic arm. Its structure is simple and practical, and it has broad application prospects. Attached Figure Description

[0031] Fig. 1 This is a three-dimensional structural diagram of this embodiment;

[0032] Fig. 2 This is a schematic diagram of the main view structure of this embodiment;

[0033] Fig. 3 This is a schematic diagram of the working state structure of this embodiment.

[0034] In the diagram: 10. End fixing seat; 11. First three-axis drive mechanism; 12. First telescopic arm; 13. Second telescopic arm; 14. Third telescopic arm; 15. First fixed end; 16. Second fixed end; 20. Normal stress fixing seat; 21. Second three-axis drive mechanism; 22. Fourth telescopic arm; 23. Fifth telescopic arm; 24. Sixth telescopic arm; 25. First normal stress loading end; 26. Second normal stress loading end; 27. First fixing seat; 28. Second fixing seat; 30. Shear stress fixing seat; 31. Two-axis drive mechanism; 32. Seventh telescopic arm; 33. Eighth telescopic arm; 34. First shear stress fixing seat; 35. Second shear stress fixing seat; 40. 41. Single-axis drive mechanism; 42. Ninth telescopic arm; 43. First shear stress loading end; 44. Second single-axis drive mechanism; 45. Tenth telescopic arm; 46. Second shear stress loading end; 47. Third fixed seat; 48. Fourth fixed seat; 59. First normal stress data collector; 50. Second normal stress data collector; 51. First normal stress sensor; 52. Second normal stress sensor; 53. Normal stress data transmitter; 54. Normal stress data transmitter; 60. First shear stress data collector; 61. Second shear stress data collector; 62. First shear stress sensor; 63. Second shear stress sensor; 64. Shear stress data transmitter; 70. First downhole probe; 71. Second downhole probe. Detailed Implementation

[0035] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby providing a clearer and more explicit definition of the scope of protection of the present invention.

[0036] See Figs. 1-3 This embodiment discloses an in-situ testing device for coal and rock mechanical parameters, including an end fixing seat 10, and a first three-axis drive mechanism 11 is provided inside the end fixing seat 10;

[0037] The output end of the first three-axis drive mechanism 11 is connected to one end of the first telescopic arm 12, one end of the second telescopic arm 13, and one end of the third telescopic arm 14, respectively. The other end of the first telescopic arm 12 is provided with a first fixed end 15, and the other end of the second telescopic arm 13 is provided with a second fixed end 16. The insertion ends of the first fixed end 15 and the second fixed end 16 are both tapered, which makes it easier to embed them into the rock wall. The first fixed end 15 and the second fixed end 16 extend through the extension of the first telescopic arm 12 and the second telescopic arm 13 until the first fixed end 15 and the second fixed end 16 are completely embedded in the rock wall, ensuring the stability of the device fixed in the rock wall.

[0038] The other end of the third telescopic arm 14 is provided with a normal stress fixing seat 20. The third telescopic arm 14 can extend the normal stress fixing seat 20 to a designated position. The normal stress fixing seat 20 is provided with a second three-axis drive mechanism 21.

[0039] The output end of the second three-axis drive mechanism 21 is connected to one end of the fourth telescopic arm 22, one end of the fifth telescopic arm 23 and one end of the sixth telescopic arm 24 respectively. The other end of the fourth telescopic arm 22 is provided with a first normal stress loading end 25, and the other end of the fifth telescopic arm 23 is provided with a second normal stress loading end 26. The first normal stress loading end 25 and the second normal stress loading end 26 simultaneously apply normal stress to the rock wall through the fourth telescopic arm 22 and the fifth telescopic arm 23 respectively.

[0040] The other end of the sixth telescopic arm 24 is provided with a shear stress fixing seat 30. The sixth telescopic arm 24 can extend the shear stress fixing seat 30 to a designated position. The shear stress fixing seat 30 is provided with a two-axis drive mechanism 31.

[0041] The output end of the two-axis drive mechanism 31 is connected to one end of the seventh telescopic arm 32 and one end of the eighth telescopic arm 33, respectively. The other end of the seventh telescopic arm 32 is provided with a first shear stress fixing seat 34, and the other end of the eighth telescopic arm 33 is provided with a second shear stress fixing seat 35. The first shear stress fixing seat 34 and the second shear stress fixing seat 35 extend to the designated position through the seventh telescopic arm 32 and the eighth telescopic arm 33, respectively.

[0042] The first shear stress fixing seat 34 is provided with a first single-axis drive mechanism 40. The output end of the first single-axis drive mechanism 40 is connected to one end of the ninth telescopic arm 41. The other end of the ninth telescopic arm 41 is provided with a first shear stress loading end 42.

[0043] The second shear stress fixing seat 35 is provided with a second single-axis drive mechanism 43. The output end of the second single-axis drive mechanism 43 is connected to one end of the tenth telescopic arm 44. The other end of the tenth telescopic arm 44 is provided with a second shear stress loading end 45.

[0044] The first shear stress loading end 42 and the second shear stress loading end 45 simultaneously apply shear stress to the rock wall through the ninth telescopic arm 41 and the tenth telescopic arm 44, respectively.

[0045] The first three-axis drive mechanism 11, the second three-axis drive mechanism 21, the two-axis drive mechanism 31, the first single-axis drive mechanism 40, and the second single-axis drive mechanism 43 are all connected to the PC control terminal of the peripheral device; the PC control terminal controls the action of each drive mechanism and then transmits the action to the output end of each telescopic arm.

[0046] The first normal stress loading end 25, the second normal stress loading end 26, the first shear stress loading end 42, and the second shear stress loading end 45 simultaneously apply normal stress and shear stress to the rock wall under test, respectively. The obtained normal stress and shear stress data are expressed by formula... Calculate the required mechanical parameter test data;

[0047] Where τ is the shear stress of the rock, and c is the cohesion of the rock. Let σ be the internal friction angle of the rock, and σ be the normal stress of the rock.

[0048] Both normal stress and shear stress are applied at a constant loading rate. Before applying normal stress and shear stress at a constant loading rate, it is necessary to ensure that the first normal stress loading end 25, the second normal stress loading end 26, the first shear stress loading end 42, and the second shear stress loading end 45 are all in close contact with the rock wall. This is to ensure the accuracy of the test results.

[0049] In one embodiment, a first fixing base 27 is provided between the fourth telescopic arm 22 and the first normal stress loading end 25, and a second fixing base 28 is provided between the fifth telescopic arm 23 and the second normal stress loading end 26. A first normal stress data collector 50 connected to the first normal stress loading end 25 is disposed within the first fixing base 27, and a second normal stress data collector 51 connected to the second normal stress loading end 26 is disposed within the second fixing base 28. A first normal stress sensor 52 is disposed within the first normal stress loading end 25, and a second normal stress sensor 53 is disposed within the second normal stress loading end 26. The first normal stress data collector 50 receives data from the first normal stress sensor. The data from the first normal stress data collector 50 and the second normal stress data collector 51 are received by the second normal stress sensor 53. The normal stress fixing base 20 is provided with a normal stress data transmission device 54. The normal stress data transmission device 54 transmits the data collected by the first normal stress data collector 50 and the second normal stress data collector 51 to the PC control terminal. The normal stress applied by the first normal stress loading end 25 and the second normal stress loading end 26 is collected by the first normal stress sensor 52 and the second normal stress loading end 26 to the first normal stress data collector 50 and the second normal stress data collector 51, respectively. The data is then transmitted to the PC control terminal through the normal stress data transmission device 54 to ensure that the collected normal stress data is more accurate.

[0050] In one embodiment, a third fixing seat 46 is provided between the ninth telescopic arm 41 and the first shear stress loading end 42, and a fourth fixing seat 47 is provided between the tenth telescopic arm 44 and the second shear stress loading end 45. A first shear stress data collector 60 connected to the first shear stress loading end 42 is disposed within the third fixing seat 46, and a second shear stress data collector 61 connected to the second shear stress loading end 45 is disposed within the fourth fixing seat 47. A first shear stress sensor 62 is disposed within the first shear stress loading end 42, and a second shear stress sensor 63 is disposed within the second shear stress loading end 45. The first shear stress data collector 60 receives data from the first shear stress sensor. The data from the first shear stress data collector 60 and the second shear stress data collector 61 are received by the second shear stress sensor 63. A shear stress data transmitter 64 is provided inside the shear stress fixing base 30. The shear stress data transmitter 64 transmits the data received by the first shear stress data collector 60 and the second shear stress data collector 61 to the PC control terminal. The shear stress applied by the first shear stress loading end 42 and the second shear stress loading end 45 is collected by the first shear stress data collector 60 and the second shear stress data collector 61 respectively through the first shear stress sensor 62 and the second shear stress loading end 45, and then transmitted to the PC control terminal through the shear stress data transmitter 64 to ensure that the collected shear stress data is more accurate.

[0051] In one embodiment, a first downhole probe 70 is installed in the normal stress fixing seat 20, and a second downhole probe 71 is installed in the shear stress fixing seat 30. The first downhole probe 70 and the second downhole probe 71 can monitor the position of the equipment downhole in real time. By cooperating with each telescopic arm, it can be ensured that each component downhole can reach the designated working location, thus ensuring the flexibility and mobility of the equipment operation.

[0052] In one embodiment, the first three-axis drive mechanism 11, the second three-axis drive mechanism 21, the two-axis drive mechanism 31, the first single-axis drive mechanism 40, and the second single-axis drive mechanism 43 are preferably drive cylinders.

[0053] When applying normal and shear stress, the device stops applying pressure if the rock wall fails. At this time, the stress data at the time of rock wall failure is recorded by the stress sensor, and transmitted to the stress data transmitter via the stress data collector, and then transmitted to the PC control terminal for calculation.

[0054] The specific operating steps for this device are as follows:

[0055] a) First, place the device in a suitable position in the borehole. Then, control the first three-axis drive mechanism 11 via the PC control terminal to extend the first telescopic arm 12 and the second telescopic arm 13, thereby driving the first fixed end 15 and the second fixed end 16 into the rock wall of the borehole to ensure the stability of the device during operation.

[0056] b) The PC control terminal controls the first three-axis drive mechanism 11 to extend the third telescopic arm 14 into the borehole depth and extend the normal stress fixing seat 20 to the designated position; the PC control terminal controls the second three-axis drive mechanism 21 to extend the sixth telescopic arm 24 into the borehole depth and extend the shear stress fixing seat 30 to the designated position. The first downhole probe 70 and the second downhole probe 71 respectively determine whether the normal stress fixing seat 20 and the shear stress fixing seat 30 have reached the predetermined working position downhole.

[0057] c) After the position is determined, the PC control terminal controls the two-axis drive mechanism 31 to extend the seventh telescopic arm 32 and the eighth telescopic arm 33, and extend the first shear stress fixing seat 34 and the second shear stress fixing seat 35 to the designated position.

[0058] d) The PC control terminal controls the second three-axis drive mechanism 21 to extend the fourth telescopic arm 22 and the fifth telescopic arm 23, and extend the first normal stress loading end 25 and the second normal stress loading end 26 to the surface of the designated rock wall (close to the rock wall); the PC control terminal controls the first single-axis drive mechanism 40 and the second single-axis drive mechanism 43 to extend the ninth telescopic arm 41 and the tenth telescopic arm 44, and extend the first shear stress loading end 42 and the second shear stress loading end 45 to the surface of the designated rock wall (close to the rock wall);

[0059] e) Simultaneously apply normal stress and shear stress at a constant rate to the rock wall;

[0060] f) When the rock wall is damaged, the stress data of normal stress is transmitted to the first normal stress data collector 50 and the second normal stress data collector 51 through the first normal stress sensor 52 and the second normal stress sensor 53 respectively for collection and summarization. The stress data of shear stress is transmitted to the first shear stress data collector 61 and the second shear stress data collector 62 through the first shear stress sensor 62 and the second shear stress sensor 63 respectively for collection and summarization. Then, it is transmitted to the PC control terminal through the normal stress data transmitter 54 and the shear stress data transmitter 64 respectively.

[0061] g) Repeat the above steps to obtain multiple sets of different normal stress and shear stress data, and then use the formula... Calculate the required mechanical parameter test data.

[0062] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. An in-situ testing device for coal and rock mechanical parameters, characterized in that, Includes an end fixing seat, and the end fixing seat is provided with a first three-axis drive mechanism; The output end of the first three-axis drive mechanism is respectively connected to one end of the first telescopic arm, one end of the second telescopic arm and one end of the third telescopic arm. The other end of the first telescopic arm is provided with a first fixed end, the other end of the second telescopic arm is provided with a second fixed end, and the other end of the third telescopic arm is provided with a normal stress fixing seat. The normal stress fixing seat is provided with a second three-axis drive mechanism; The output ends of the second and third axis drive mechanisms are respectively connected to one end of the fourth telescopic arm, one end of the fifth telescopic arm and one end of the sixth telescopic arm. The other end of the fourth telescopic arm is provided with a first normal stress loading end, the other end of the fifth telescopic arm is provided with a second normal stress loading end, and the other end of the sixth telescopic arm is provided with a shear stress fixing seat. The shear stress fixing seat is equipped with a two-axis drive mechanism. The output ends of the two-axis drive mechanism are respectively connected to one end of the seventh telescopic arm and one end of the eighth telescopic arm. The other end of the seventh telescopic arm is provided with a first shear stress fixing seat, and the other end of the eighth telescopic arm is provided with a second shear stress fixing seat. The first shear stress fixing seat is provided with a first single-axis drive mechanism. The output end of the first single-axis drive mechanism is connected to one end of the ninth telescopic arm. The other end of the ninth telescopic arm is provided with a first shear stress loading end. The second shear stress fixing seat is provided with a second single-axis drive mechanism. The output end of the second single-axis drive mechanism is connected to one end of the tenth telescopic arm. The other end of the tenth telescopic arm is provided with a second shear stress loading end. The first three-axis drive mechanism, the second three-axis drive mechanism, the two-axis drive mechanism, the first single-axis drive mechanism, and the second single-axis drive mechanism are all communicatively connected to the PC control terminal of the peripheral device; The first normal stress loading end, the second normal stress loading end, the first shear stress loading end, and the second shear stress loading end simultaneously apply normal stress and shear stress to the rock wall under test, respectively. The obtained normal stress and shear stress data are expressed by formula... Calculate the required mechanical parameter test data; Where τ is the shear stress of the rock, and c is the cohesion of the rock. Let σ be the internal friction angle of the rock, and σ be the normal stress of the rock.

2. The in-situ testing equipment for coal and rock mechanical parameters according to claim 1, characterized in that, A first fixed seat is provided between the fourth telescopic arm and the first normal stress loading end, and a second fixed seat is provided between the fifth telescopic arm and the second normal stress loading end.

3. The in-situ testing equipment for coal and rock mechanical parameters according to claim 2, characterized in that, The first fixed base is provided with a first normal stress data collector connected to the first normal stress loading end, and the second fixed base is provided with a second normal stress data collector connected to the second normal stress loading end.

4. The in-situ testing equipment for coal and rock mechanical parameters according to claim 3, characterized in that, A first normal stress sensor is provided inside the first normal stress loading end, and a second normal stress sensor is provided inside the second normal stress loading end; the first normal stress data collector receives data from the first normal stress sensor, and the second normal stress data collector receives data from the second normal stress sensor.

5. The in-situ testing equipment for coal and rock mechanical parameters according to claim 4, characterized in that, The normal stress fixing seat is equipped with a normal stress data transmission device, which transmits the data collected by the first normal stress data collector and the second normal stress data collector to the PC control terminal.

6. The in-situ testing equipment for coal and rock mechanical parameters according to claim 1, characterized in that, A third fixing seat is provided between the ninth telescopic arm and the first shear stress loading end, and a fourth fixing seat is provided between the tenth telescopic arm and the second shear stress loading end.

7. The in-situ testing equipment for coal and rock mechanical parameters according to claim 6, characterized in that, The third fixing base is equipped with a first shear stress data collector connected to the first shear stress loading end, and the fourth fixing base is equipped with a second shear stress data collector connected to the second shear stress loading end.

8. The in-situ testing equipment for coal and rock mechanical parameters according to claim 7, characterized in that, A first shear stress sensor is provided inside the first shear stress loading end, and a second shear stress sensor is provided inside the second shear stress loading end; the first shear stress data collector receives data from the first shear stress sensor, and the second shear stress data collector receives data from the second shear stress sensor.

9. The in-situ testing equipment for coal and rock mechanical parameters according to claim 8, characterized in that, The shear stress fixing seat is equipped with a shear stress data transmission device, which transmits the data collected by the first shear stress data collector and the second shear stress data collector to the PC control terminal.

10. The in-situ testing equipment for coal and rock mechanical parameters according to claim 1, characterized in that, A first downhole probe is installed inside the normal stress fixing seat, and a second downhole probe is installed inside the shear stress fixing seat.

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