Method for testing influence of coal seam drilling hydraulic caving on surrounding coal body stress

Abstract

The invention relates to the technical field of coal seam mining, and provides a method for testing the influence of coal seam drilling hydraulic caving on surrounding coal stress, which comprises the following steps: determining the target position of a test hole according to the target position of a caving hole; processing a test hole at the target position of the test hole; placing a stress test element in the test hole, wherein the stress test element is suitable for detecting the stress state around the test hole; performing hydraulic cave-making operation at the target position of the cave-making hole; and acquiring a detection result of the stress test element in the hydraulic cave-making operation process and within the target time after the hydraulic cave-making operation is finished. Through the arrangement, according to the detection result of the stress testing element, the influence of coal seam drilling hydraulic caving on the surrounding coal body stress can be analyzed and determined, and the stress testing element is used for detecting in the hydraulic caving site construction process, so that the detection is rapid and accurate; the problem that in the prior art, the stress influence of coal seam drilling hydraulic caving on the surrounding coal body cannot be accurately detected is solved.

Description

Technical Field

[0001] The invention relates to the technical field of coal seam mining, and in particular to a method for testing the influence of hydraulic cavitation of coal seam drilling on the stress of surrounding coal bodies. Background Art

[0002] Most coal seams in my country are characterized by heterogeneity, high gas content, low permeability and low gas saturation. Soft and low-permeability coal seams account for a large proportion of my country's mineable coal seams. Soft and low-permeability coal seams often have low permeability characteristics. The low permeability of coal seams makes gas extraction difficult, causing the "extraction-digging-extraction" imbalance of mines, forming major safety hazards, and laying hidden dangers for the occurrence of coal mine gas accidents.

[0003] Among some related technologies, coal seam drilling hydraulic cavitation technology is mainly used to improve the permeability and permeability of coal seams. That is, a hole is drilled into the coal seam and high-pressure water is injected into the coal seam. A large amount of coal body is flushed out by high-pressure jets to form cracks and cavities, improve the structure of the coal seam, and provide space for gas penetration and discharge. Although it can effectively improve the permeability of coal seams, drilling holes, cracks, cavities, etc. will have a negative impact on the surrounding coal body. At present, it is impossible to evaluate the extent of the negative impact, which still poses a huge safety hazard and becomes a technical difficulty at the coal mine site.

[0004] Therefore, how to solve the problem in the related art that the stress influence of hydraulic cavitation in coal seam drilling on the surrounding coal body cannot be accurately detected has become an important technical problem to be solved by those skilled in the art. Summary of the invention

[0005] The present invention provides a method for testing the influence of hydraulic cavitation of coal seam drilling on the stress of surrounding coal bodies, so as to solve the defect in the related art that the influence of hydraulic cavitation of coal seam drilling on the stress of surrounding coal bodies cannot be accurately detected.

[0006] The present invention provides a method for testing the influence of hydraulic cavitation in coal seam drilling on the stress of surrounding coal bodies, comprising: According to the target position of the burrowing hole, the target position of the testing hole is determined; Processing the test hole at a target position of the test hole; Placing a stress testing element in the testing hole, wherein the stress testing element is suitable for detecting a stress state around the testing hole; Performing a hydraulic cavitation operation at a target location of the cavitation hole; During the hydraulic cavitation operation and within a target time after the hydraulic cavitation operation is completed, the detection result of the stress testing element is obtained.

[0007] According to a test method for the influence of hydraulic cavitation of coal seam drilling on the stress of surrounding coal bodies provided by the present invention, the cavitation holes are processed in groups, and the cavitation holes in each group are spaced apart and distributed along the extension direction of the tunnel; Each group of the cavitation holes corresponds to a group of the testing holes, and at least one testing hole is provided corresponding to every two adjacent cavitation holes.

[0008] According to a testing method for the influence of hydraulic cavitation in coal seam drilling on the stress of surrounding coal bodies provided by the present invention, the cavitation holes in each group and the testing holes in each group are staggered, and the distances between any adjacent two holes along the extension direction of the tunnel are different.

[0009] According to a test method for the influence of hydraulic cavitation of coal seam drilling on the stress of surrounding coal bodies provided by the present invention, the height of the cavitation hole is greater than the height of the test hole, and the distance between the cavitation hole and the test hole along the height direction of the coal wall is 0.1-0.3 meters; The distance between the cavitation hole and the test hole along the extension direction of the tunnel is 1.0-3.5 meters.

[0010] According to a test method for the influence of hydraulic cavitation of coal seam drilling on the stress of surrounding coal bodies provided by the present invention, each group of test holes includes four test holes, each group of cavitation holes includes three cavitation holes, and one cavitation hole is correspondingly arranged between two adjacent test holes; The distances between adjacent test holes and cavitation holes along the extension direction of the tunnel are 1 meter, 1.5 meters, 2.0 meters, 2.5 meters and 3 meters respectively.

[0011] According to a test method for the influence of hydraulic cavitation in coal seam drilling on the stress of surrounding coal bodies provided by the present invention, at least two groups of cavitation holes need to be processed, and each group of cavitation holes is distributed at intervals along the extension direction of the tunnel.

[0012] According to a method for testing the influence of hydraulic cavitation in coal seam drilling on the stress of surrounding coal bodies provided by the present invention, the hydraulic cavitation operation is performed at the target position of the cavitation hole, comprising: Processing the hole-making hole at a target position of the hole-making hole, and processing hydraulic holes at multiple positions in a depth direction of the hole-making hole; Among the hydraulic holes corresponding to each of the hole making holes, the one closest to the coal wall is called the first hydraulic hole, and the processing depth of the test hole is greater than or equal to the depth of the first hydraulic hole.

[0013] According to a method for testing the influence of hydraulic cavitation in coal seam drilling on the stress of surrounding coal bodies provided by the present invention, when processing each hydraulic cavity, the cavitation pressure is adjusted according to a first preset time interval; When the total hole making time of each hydraulic hole reaches a preset time and the coal output of each hydraulic hole reaches a preset coal output, the hydraulic hole making operation is stopped.

[0014] According to a method for testing the influence of hydraulic cavitation in coal seam drilling on the stress of surrounding coal bodies provided by the present invention, the detection result of the stress testing element is obtained during the hydraulic cavitation operation and within a target time after the hydraulic cavitation operation is completed, including: During the hydraulic cavitation operation, obtaining the detection result of the stress testing element at a second preset time interval; Within a target time after the hydraulic cavitation operation is completed, a detection result of the stress testing element is obtained according to a third preset time interval.

[0015] According to a method for testing the influence of hydraulic cavitation in coal seam drilling on the stress of surrounding coal bodies provided by the present invention, the diameter of the test hole is 40-50 mm.

[0016] In the test method for the influence of hydraulic cavitation of coal seam drilling on the stress of surrounding coal bodies provided by the present invention, the target position of the test hole is first determined according to the target position of the cavitation hole; and then the test hole is processed at the target position of the test hole. Then a stress testing element is placed in the test hole, and the stress testing element can detect the stress state around the test hole. A hydraulic cavitation operation is performed at the target position of the cavitation hole; during the hydraulic cavitation operation and within the target time after the hydraulic cavitation operation is completed, the detection result of the stress testing element is obtained. In this way, before hydraulic cavitation, a test hole is first processed around the target position of the cavitation hole, and a stress testing element is placed in the test hole, and then a hydraulic cavitation operation is performed at the target position of the cavitation hole. During the hydraulic cavitation operation and within a certain period of time after the hydraulic cavitation operation is completed, the stress state around the test hole can be detected in real time by the stress testing element. Based on the test results of the stress testing element, the influence of hydraulic cavitation in coal seam drilling on the stress of the surrounding coal body can be analyzed and determined. Moreover, the stress testing element is tested during the on-site construction of hydraulic cavitation, which is fast and accurate, solving the problem in related technologies that the influence of hydraulic cavitation in coal seam drilling on the stress of the surrounding coal body cannot be accurately detected. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1It is a flow chart of the testing method for the influence of hydraulic cavitation in coal seam drilling on the stress of surrounding coal bodies provided by the present invention.

[0019] Figure 2 It is a schematic diagram of the relative positions of the cavitation holes and the test holes provided by the present invention along the top view direction.

[0020] Figure 3 It is a schematic diagram of the relative positions of the cavitation holes and the test holes on the coal wall provided by the present invention.

[0021] Reference numerals: 1. Hole making hole; 2. Test hole; 3. Stress test element; 4. Hydraulic hole; 5. First hydraulic hole; 6. Tunnel; 7. Coal wall. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings 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.

[0023] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0024] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0025] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0027] Combine the following Figures 1 to 3 The present invention describes a testing method for the influence of hydraulic cavitation in coal seam drilling on the stress of surrounding coal bodies.

[0028] like Figure 1 and Figure 3 As shown, the method for testing the influence of hydraulic cavitation in coal seam drilling on the stress of surrounding coal bodies provided by the embodiment of the present invention mainly includes steps 110 to 150.

[0029] Step 110: Determine the target position of the test hole according to the target position of the acupuncture hole.

[0030] Step 120 , machining a test hole at a target position of the test hole.

[0031] Step 130: placing a stress testing element in the testing hole, where the stress testing element is suitable for detecting the stress state around the testing hole.

[0032] Step 140: Perform hydraulic cavitation operation at the target location of the cavitation hole.

[0033] Step 150: Acquire the test result of the stress test element during the hydraulic cavitation operation and within a target time after the hydraulic cavitation operation is completed.

[0034] That is to say, before hydraulic cavitation, the test hole 2 is first processed around the target position of the cavitation hole 1, and the stress testing element 3 is placed in the test hole 2. Then the hydraulic cavitation operation is performed at the target position of the cavitation hole 1. During the hydraulic cavitation operation and within a certain period of time after the hydraulic cavitation operation is completed, the stress state around the test hole 2 can be detected in real time by the stress testing element 3.

[0035] With such arrangement, based on the detection result of the stress testing element 3, the influence of hydraulic cavitation in coal seam drilling on the stress of the surrounding coal body can be analyzed and determined, and the stress testing element 3 is detected during the on-site construction of the hydraulic cavitation, which is fast and accurate, and solves the problem in the related technology that the influence of hydraulic cavitation in coal seam drilling on the stress of the surrounding coal body cannot be accurately detected.

[0036] Specifically, the stress testing element 3 may be a drilling stress gauge.

[0037] In the embodiment of the present invention, the cave holes 1 are processed in groups, each group of cave holes 1 includes a plurality of cave holes 1, and each cave hole 1 is spaced apart along the extension direction of the lane 6. Specifically, the distance between two adjacent cave holes 1 along the extension direction of the lane 6 is 3.5-5.0 meters.

[0038] Each group of cavitation holes 1 corresponds to a group of test holes 2, and at least one test hole 2 is provided for each two adjacent cavitation holes 1. In other words, each test hole 2 is also distributed at intervals around the cavitation holes 1 along the extension direction of the lane 6.

[0039] With such arrangement, the detection results of the stress testing elements 3 in each test hole 2 are analyzed comprehensively, which can avoid the influence of accidental factors, special positions and other special factors on the accuracy of the stress influence analysis results.

[0040] The diameter of the cavitation hole 1 is generally set to 120 mm. In this embodiment, the diameter of the test hole 2 is 40-50 mm. Specifically, the diameter of the test hole 2 can be set to 45 mm.

[0041] In a further embodiment, each cavitation hole 1 of each group is spaced apart from each test hole 2 of each group, that is, there is one test hole 2 between any two adjacent cavitation holes 1, and there is one cavitation hole 1 between any two adjacent test holes 2.

[0042] The distances between any two adjacent cavitation holes 1 and test holes 2 that are distributed at intervals are different. That is to say, each stress testing element 3 is used to detect the stress state at different distances from the cavitation hole 1, and each stress testing element 3 corresponds to a distance. Through the detection of each stress testing element 3, the stress state at different distances around the cavitation hole 1 is obtained, and the stress influence of the hydraulic cavitation operation of coal seam drilling on the coal body at different distances around can be determined, which has a higher reference value.

[0043] In the embodiment of the present invention, the height of the cavitation hole 1 is greater than the height of the test hole 2. Along the height direction of the coal wall 7, the distance between the cavitation hole 1 and the test hole 2 is 0.1-0.3 meters.

[0044] Facing the extension direction of the tunnel 6, the coal wall 7 is located on both sides of the tunnel 6. Specifically, the test hole 2 can be processed at a position 1.7 meters away from the bottom of the coal wall 7, and the cavitation hole 1 can be processed at a position 2 meters away from the bottom of the coal wall 7. At this time, the distance between the cavitation hole 1 and the test hole 2 along the height direction of the coal wall 7 is 0.3 meters.

[0045] In this embodiment, when determining the target position of the test hole 2 according to the target position of the cavitation hole 1, it is necessary to ensure the distance between the cavitation hole 1 and the test hole 2. Along the extension direction of the lane 6, the distance between the cavitation hole 1 and the test hole 2 is 1.0-3.5 meters.

[0046] In a specific embodiment, each group of test holes 2 includes four test holes 2, each group of cavitation holes 1 includes three cavitation holes 1, and one cavitation hole 1 is correspondingly arranged between two adjacent test holes 2. Figure 2 and Figure 3 The distances between adjacent test holes 2 and burrowing holes 1 are 1 meter, 1.5 meters, 2.0 meters, 2.5 meters and 3 meters respectively. Figure 2 Only the numerical value of the distance is marked, and the unit of the distance is not marked. The unit is meter.

[0047] With such arrangement, the distances between adjacent test holes 2 and cavitation holes 1 are distributed in an equidistant manner, which can facilitate statistical analysis of the test results and improve the efficiency of statistical analysis.

[0048] In this embodiment, at least two groups of cavitation holes 1 need to be processed, and each group of cavitation holes 1 is spaced apart along the extension direction of the lane 6. Stress influence tests can be performed on different positions along the extension direction of the lane 6 to minimize safety hazards.

[0049] In the embodiment of the present invention, a hydraulic cavitation operation is performed at a target location of the cavitation hole, including step 141 and step 142 .

[0050] Step 141, processing the hole at the target position of the hole.

[0051] Step 142, processing hydraulic holes 4 at multiple positions in the depth direction of the hole making hole.

[0052] That is to say, in the depth direction of the cavitation hole 1, the multiple hydraulic holes 4 corresponding to each cavitation hole 1 are distributed at intervals.

[0053] Among the hydraulic holes 4 corresponding to each hole-making hole 1, the one closest to the coal wall 7 is called the first hydraulic hole 5. In this embodiment, the processing depth of the test hole 2 is also determined according to the distance between the first hydraulic hole 5 and the coal wall 7. Specifically, the processing depth of the test hole 2 can be greater than or equal to the depth of the first hydraulic hole 5.

[0054] The stress testing element 3 may be placed at the bottom of the testing hole 2 , where the bottom of the testing hole 2 is an end of the testing hole 2 away from the coal wall 7 .

[0055] The stress testing element 3 may also be placed at a position at a distance from the coal wall 7 that is the depth at which the first hydraulic hole 5 is located.

[0056] In a specific embodiment, the depth of the first hydraulic hole 5 can be 16 meters, the depth of the hole-making hole 1 can be 100 meters, and each hole-making hole 1 can be processed with 7 to 10 hydraulic holes 4. During the hydraulic hole-making operation, when the hole-making hole 1 is processed to 16 meters, the first hydraulic hole 5 is processed in a section with a distance of 15 to 16 meters from the coal wall 7. After the first hydraulic hole 5 is processed, the hole-making hole 1 is continued to be processed, and the next hydraulic hole 4 is processed at the processing position of the next hydraulic hole 4, and so on.

[0057] In an embodiment of the present invention, during the hydraulic hole making operation, when processing each hydraulic hole 4, it is necessary to adjust the hole making pressure according to a first preset time interval; and when the total hole making time of each hydraulic hole 4 reaches the preset time and the coal output of each hydraulic hole 4 reaches the preset coal output, the hydraulic hole making operation is stopped.

[0058] Specifically, the first preset time interval is 5 minutes, and the cavitation pressure is 5 MPa, 8 MPa, 10 MPa, 12 MPa and 15 MPa. When processing each hydraulic cavity 4, the initial cavitation pressure is 5 MPa, and the cavitation pressure is adjusted every five minutes, and the cavitation pressure increases step by step. The above preset time is 30 minutes, and the preset coal output is 1 cubic meter. The total cavitation time of each hydraulic cavity 4 is not less than 30 minutes, and when the coal output of each hydraulic cavity 4 reaches 1 cubic meter, the cavitation operation of the hydraulic cavity 4 can be stopped.

[0059] In the embodiment of the present invention, obtaining the detection result of the stress testing element during the hydraulic cavitation operation and within the target time after the hydraulic cavitation operation is completed includes step 151 and step 152.

[0060] Step 151: During the hydraulic cavitation operation, obtain the detection result of the stress testing element at a second preset time interval.

[0061] Step 152: within the target time after the hydraulic cavitation operation is completed, obtain the detection result of the stress testing element according to the third preset time interval.

[0062] The second preset time interval is 1 minute, the third preset time interval is 1 hour, and the target time is 48 hours.

[0063] That is to say, during the hydraulic cavitation operation, the detection result of the stress testing element 3 is obtained every 1 minute. Within 48 hours after the hydraulic cavitation operation is completed, the detection result of the stress testing element 3 is obtained every 1 hour.

[0064] In summary, the test method for the influence of hydraulic cavitation of coal seam drilling on the stress of surrounding coal bodies provided by the embodiment of the present invention belongs to an on-site in-situ test method. In terms of time, the stress change data of the coal bodies around each cavitation hole 1 during the hydraulic cavitation operation and within 48 hours after the operation is completed are obtained; in terms of space, the stress change data within the range of 1.0 to 3.5 meters around each cavitation hole 1 are obtained; by analyzing the change rules of different temporal and spatial data, the pressure relief radius of hydraulic cavitation of coal seam drilling can be measured quickly and accurately, and then the influence of hydraulic cavitation of coal seam drilling on the stress of surrounding coal bodies can be accurately evaluated.

[0065] 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 make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for testing the influence of hydraulic cavitation in coal seam drilling on the stress of surrounding coal bodies, characterized in that: include: Determining the target position of the test hole (2) according to the target position of the burrowing hole (1); Processing the test hole (2) at a target position of the test hole (2); A stress testing element (3) is placed in the testing hole (2), wherein the stress testing element (3) is suitable for detecting the stress state around the testing hole (2); Performing a hydraulic cavitation operation at a target position of the cavitation hole (1); During the hydraulic cavitation operation and within a target time after the hydraulic cavitation operation is completed, a detection result of the stress testing element (3) is obtained.

2. The test method for the influence of hydraulic cavitation of coal seam drilling on the stress of surrounding coal bodies according to claim 1 is characterized in that: The cavitation holes (1) are processed in groups, and the cavitation holes (1) in each group are spaced apart and distributed along the extension direction of the lane (6); Each group of the cavitation holes (1) corresponds to a group of the testing holes (2), and at least one testing hole (2) is provided corresponding to every two adjacent cavitation holes (1).

3. The test method for the influence of hydraulic cavitation of coal seam drilling on the stress of surrounding coal bodies according to claim 2 is characterized in that: The cavitation holes (1) of each group and the test holes (2) of each group are arranged in a staggered manner, and the distances between any two adjacent holes along the extension direction of the lane (6) are different.

4. The method for testing the influence of hydraulic cavitation in coal seam drilling on the stress of surrounding coal bodies according to claim 3, characterized in that: The height of the burrowing hole (1) is greater than the height of the test hole (2), and the distance between the burrowing hole (1) and the test hole (2) along the height direction of the coal wall (7) is 0.1-0.3 meters; The distance between the burrowing hole (1) and the testing hole (2) along the extension direction of the tunnel (6) is 1.0 to 3.5 meters.

5. The test method for the influence of hydraulic cavitation in coal seam drilling on the stress of surrounding coal bodies according to claim 3 is characterized in that: Each group of the test holes (2) comprises four test holes (2), each group of the cavitation holes (1) comprises three cavitation holes (1), and one cavitation hole (1) is correspondingly arranged between two adjacent test holes (2); The distances between adjacent test holes (2) and the cave-making holes (1) along the extension direction of the tunnel (6) are 1 meter, 1.5 meters, 2.0 meters, 2.5 meters and 3 meters respectively.

6. The method for testing the influence of hydraulic cavitation of coal seam drilling on the stress of surrounding coal bodies according to any one of claims 2 to 5, characterized in that: At least two groups of the cavitation holes (1) need to be processed, and each group of the cavitation holes (1) is distributed at intervals along the extension direction of the lane (6).

7. The method for testing the influence of hydraulic cavitation of coal seam drilling on the stress of surrounding coal bodies according to any one of claims 2 to 5, characterized in that: The hydraulic cavitation operation is performed at the target position of the cavitation hole (1), comprising: Processing the hole-making hole (1) at a target position of the hole-making hole (1), and processing hydraulic holes (4) at multiple positions in a depth direction of the hole-making hole (1); Among the hydraulic holes (4) corresponding to each of the hole-making holes (1), the one closest to the coal wall (7) is called a first hydraulic hole (5), and the processing depth of the test hole (2) is greater than or equal to the depth of the first hydraulic hole (5).

8. The method for testing the influence of hydraulic cavitation in coal seam drilling on the stress of surrounding coal bodies according to claim 7, characterized in that: When processing each hydraulic cavity (4), the cavity-making pressure is adjusted according to a first preset time interval; When the total hole making time of each hydraulic hole (4) reaches a preset time and the coal output of each hydraulic hole (4) reaches a preset coal output, the hydraulic hole making operation is stopped.

9. The method for testing the influence of hydraulic cavitation of coal seam drilling on the stress of surrounding coal bodies according to any one of claims 2 to 5, characterized in that: The step of obtaining the detection result of the stress testing element (3) during the hydraulic cavitation operation and within a target time after the hydraulic cavitation operation is completed includes: During the hydraulic cavitation operation, obtaining the detection result of the stress testing element (3) at a second preset time interval; Within a target time after the hydraulic cavitation operation is completed, the detection result of the stress testing element (3) is obtained according to a third preset time interval.

10. The method for testing the influence of hydraulic cavitation of coal seam drilling on the stress of surrounding coal bodies according to any one of claims 2 to 5, characterized in that: The diameter of the test hole (2) is 40-50 mm.

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