Method for monitoring rock burst mine in safety expansion period through drilling cutting method

Abstract

The invention relates to the technical field of coal mining and coal mine safety, in particular to a drilling cutting method monitoring method in a rock burst mine safety expansion period, which comprises the following steps of: performing safety expansion tunneling when open-off cuts are formed in a working surface; the method comprises the steps that a working face open-off cut area is divided into a conduction area and an expanded safety area, a plurality of first drilling cutting monitoring holes are constructed in the expanded safety tunneling area, any two adjacent drilling cutting monitoring holes are spaced, and when tunneling is conducted in the expanded safety area, the number of the first drilling cutting monitoring holes is determined according to the area of the preset tunneling expanded safety area. According to the drilling cutting method monitoring method in the rock burst mine safety expansion period, the drilling cutting method is adopted for monitoring the safety expansion work, and the construction safety is improved.

Description

Technical Field

[0001] The invention relates to the technical field of coal mining and coal mine safety, and in particular to a method for monitoring rock burst during mine expansion using a drill cuttings method. Background Art

[0002] Impact ground pressure refers to the sudden and violent destructive dynamic phenomenon caused by the instantaneous release of elastic deformation energy of coal and rock masses around coal mine shafts or working faces. It is often accompanied by instantaneous displacement, ejection, loud noises and air waves of coal and rock masses, which has a great impact on the safe and efficient production of mines.

[0003] With the development of science and technology, a method of open-eye tunneling has emerged, which is to first open the eye from one side, and then expand the eye from the side of the coal wall while installing the working face equipment. This method is called expansion tunneling.

[0004] When installing equipment to excavate the working face, it is necessary to monitor the drill cuttings during the expansion and excavation so that the staff can predict the danger of impact ground pressure on the expansion and excavation working face. Summary of the invention

[0005] The present invention is based on the inventor's discovery and understanding of the following facts and problems:

[0006] There are relevant regulations on the use of the drill cuttings method to monitor the excavation working face, coal mining working face and two drifts of rock burst mines, but there are no relevant regulations on the use of the drill cuttings method to monitor the expansion working face. With the development of new materials, new equipment, new processes and new technologies, more and more rock burst mines adopt the expansion excavation method. In order to use the drill cuttings method to monitor the rock burst danger in the expansion working face, this gap needs to be filled to avoid blind support during the expansion period to increase costs, or inadequate support leading to flying gangue, etc.

[0007] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, an embodiment of the present invention provides a method for monitoring the drilling method during the expansion of a rock burst mine, which uses the drilling method to monitor the expansion work and improve the safety of the construction.

[0008] The arrangement method of drilling cuttings monitoring during expansion and installation of a rock burst mine according to an embodiment of the present invention includes performing expansion and installation excavation when a cut is made on the working face to divide the cut area of ​​the working face into a conduction area and an expansion and installation area.

[0009] Constructing a plurality of first drill cuttings monitoring holes in the area of ​​expansion and excavation, with any two adjacent drill cuttings monitoring holes being spaced apart;

[0010] When excavating in the expansion area, the number of the first drilling cuttings monitoring holes is determined by presetting the area of ​​the expansion area to be excavated.

[0011] The method for monitoring the expansion of a rock burst mine using the drill cuttings method according to the embodiment of the present invention uses the drill cuttings method to monitor the expansion work, thereby improving the safety of the construction.

[0012] In some embodiments, the cutting area of ​​the working surface is divided into a strong impact area, a weak impact area and a non-impact area.

[0013] If the security expansion area is in a strong impact area, the 10m 2 ~15m 2 Two first cuttings monitoring holes are arranged inside.

[0014] If the expansion area is in a weak impact area, the 15m 2 ~20m 2 Two first cuttings monitoring holes are arranged inside.

[0015] If the expansion area is in a non-impact area, the 15m 2 ~20m 2 A first drill cuttings monitoring hole is arranged inside.

[0016] In some embodiments, when constructing the first drill cuttings monitoring hole in the expansion area, the extension direction of the first monitoring drill cuttings hole is parallel to the mining direction of the working face, or there is an angle between the extension direction of the first monitoring drill cuttings hole and the mining direction of the working face.

[0017] In some embodiments, a plurality of first drill cuttings monitoring holes are arranged in the circumferential direction of the expansion area.

[0018] In some embodiments, a second drill cuttings monitoring hole is constructed in the two side areas of the working face mining, and a second drill cuttings monitoring hole is constructed in the side of the tunnel within 100m of the working face cutting eye, and the distance between the second drill cuttings monitoring hole and the bottom plate in the vertical direction is a, 0.5m≤a≤1.5m.

[0019] In some embodiments, the number of second drill cuttings monitoring holes monitored each time in the conductive area within 60m behind the expansion and security area and within 100m in front of the expansion and security area should be no less than 3, and the monitoring interval of the second drill cuttings monitoring holes is 10m to 30m.

[0020] In some embodiments, the depth of the second drill cuttings monitoring hole is t, the height of the excavation tunnel is H, 3H≤t≤4H, and t≤15m.

[0021] In some embodiments, the monitoring interval of the second drill cuttings hole is 1 day to 3 days.

[0022] In some embodiments, stress sensors are placed on the surrounding rock in the tunnel to monitor the disturbance to the surrounding rock during expansion.

[0023] In some embodiments, when constructing the first drill cuttings monitoring hole or the second drill cuttings monitoring hole, the first drill cuttings monitoring hole or the second drill cuttings monitoring hole is cleaned. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the arrangement method of the drill cuttings monitoring during the expansion and installation of the rock burst mine according to the embodiment of the present invention.

[0025] Figure 2 It is a top view schematic diagram of the conduction area and the expansion area of ​​an embodiment of the present invention.

[0026] Reference numerals:

[0027] Working face 1, working face cutting eye 2, return air lane 3, transport lane 4, conduction area 21, expansion area 22, first drill cuttings monitoring hole 5, second drill cuttings monitoring hole 6. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0029] The arrangement method of drilling cuttings monitoring during expansion and installation of a rock burst mine according to the embodiment of the present invention includes: when a cut-off is opened on a working face 1, expansion and installation excavation is performed to divide the cut-off area 2 of the working face into a conducting area 21 and an expansion and installation area 22;

[0030] Constructing a plurality of first cuttings monitoring holes 5 in the area of ​​expansion and excavation, with any two adjacent cuttings monitoring holes being spaced apart;

[0031] When excavating in the expansion area 22 , the number of the first drilling cuttings monitoring holes 5 is determined by presetting the area of ​​the expansion area 22 to be excavated.

[0032] Specifically, the mining direction of the working face 1 is set to the left-right direction, the length direction of the working face 1 is the left-right direction, the left-right direction is orthogonal to the front-back direction and the gravity direction, and the gravity direction is the up-down direction. Before mining coal, it is necessary to install coal mining equipment, such as hydraulic supports, coal mining machines and scraper conveyors. Since the length of the working face 1 is long, the time for opening the cut may last for several weeks. When excavating and expanding the working face 1 to accommodate the coal mining equipment, it is necessary to strengthen the monitoring of the expansion area 22, so that the operator can use the stress concentration in advance, or the impact of the impact ground pressure on the expansion area 22, resulting in the collapse of flying gangue or the roof. For example, the operator can strengthen the support of the cut or drill pressure relief according to the monitoring of the drill cuttings and the stress concentration of the surrounding rock.

[0033] The working face cutting eye 2 area is divided into a conductive area 21 and an expanded area 22 which are interconnected. Coal mining equipment is installed in the conductive area 21 and the expanded area 22. The expanded area 22 is an expansion area for the equipment in the coal mining direction to accommodate the coal mining equipment to avoid the conductive area 21 being too small to make it impossible to install the coal mining equipment.

[0034] A plurality of first drill cuttings monitoring holes 5 are constructed in the area of ​​expansion and excavation, and any two adjacent drill cuttings monitoring holes are spaced apart to monitor the entire expansion and excavation area 22 by the drill cuttings method. At the same time, the staff can also set stress sensors by setting the surrounding rock mountain, and then use them together with the drill cuttings method to monitor the stress concentration of the expansion and excavation area 22. At the same time, the number of first drill cuttings monitoring holes 5 is determined by presetting the area of ​​the expansion and excavation area 22. Then, a corresponding number of first drill cuttings monitoring holes 5 are set for the expansion and excavation area 22 of a certain area, so as to avoid the waste of manpower and material resources caused by excessive construction, and to avoid the decrease of monitoring effect caused by too few holes.

[0035] The method for monitoring the expansion and installation of a rock burst mine by the drill cuttings method according to the embodiment of the present invention divides the working face cutting area 2 into a conducting area 21 and an expansion and installation area 22, and monitors the expansion and installation working face 1 by the drill cuttings method. When excavating in the expansion and installation area 22, the number of the first drill cuttings monitoring holes 5 is determined by presetting the excavation area of ​​the expansion and installation area 22, and then a corresponding number of first drill cuttings monitoring holes 5 are set for the construction of a certain area of ​​the expansion and installation area 22, so as to avoid the waste of manpower and material resources caused by excessive construction, and avoid the decrease in monitoring effect caused by too few holes, thereby improving the monitoring effect of the expansion and installation area 22, and thus facilitating the construction personnel to continue the construction of the subsequent cutting area, so as to refer to the stress concentration of the surrounding rock in the cutting area, and improve the safety of construction.

[0036] In some embodiments, the working face cut-eye 2 area is divided into a strong impact area, a weak impact area, and a non-impact area.

[0037] If the expansion area 22 is in a strong impact area, two first cuttings monitoring holes 5 are arranged within 10m2 to 15m2.

[0038] If the expansion area 22 is in a weak impact area, two first cuttings monitoring holes 5 are arranged within 15m2 to 20m2.

[0039] If the expansion area 22 is in a non-impact area, a first drill cuttings monitoring hole 5 is arranged within 15m2 to 20m2.

[0040] For example, the impact area is divided into three zones: strong impact area, weak impact area and non-impact area by the elastic energy index, impact energy index, dynamic failure time and uniaxial compressive strength of the coal body around the surrounding rock of working face 1.

[0041] If WET <2, K E When <1.5, Dt>500, and Rc<7 are satisfied at the same time, the surrounding rock of working face 1 is a non-impact area.

[0042] If 2≤W ET ≤5,1.5≤K E When ≤5, 50≤Dt≤500, and 7≤Rc≤14 are satisfied at the same time, the surrounding rock of tunnel working face 1 is a weak impact area.

[0043] If W ET >5,K E >5, Dt≤50, 14≤Rc are satisfied at the same time, then the surrounding rock of working face 1 is divided into strong impact area. Specifically, if Figure 1 to Figure 2 As shown in the following table:

[0044] Impact hazard Non-strong impact area Weak impact area Strong impact area Elasticity Index <![CDATA[W ET <2]]> <![CDATA[2≤W ET ≤5]]> <![CDATA[W ET >5]]> Impact Energy Index <![CDATA[K E <1.5]]> <![CDATA[1.5≤K E ≤5]]> <![CDATA[K E >5]]> Dynamic destruction time / ms Dt>500 50≤Dt≤500 Dt≤50 Uniaxial compressive strength / MPa Rc<7 7≤Rc≤14 14≤Rc

[0045] The surrounding rock of the working face 1 is then divided into three zones: strong impact zone, weak impact zone, and non-impact zone, so as to facilitate the targeted construction of drill cuttings monitoring technology for the corresponding conductive area 21 or expansion area 22, thereby avoiding inadequate monitoring of the impact area or the construction of too many first drill cuttings monitoring holes 5, which leads to increased costs.

[0046] In some embodiments, when constructing the first drill cuttings monitoring hole 5 in the expansion area 22, the extension direction of the first monitoring drill cuttings hole is parallel to the mining direction of the working face 1, or there is an angle between the extension direction of the first monitoring drill cuttings hole and the mining direction of the working face 1.

[0047] For example, when constructing the first drill cuttings monitoring hole 5, the first drill cuttings monitoring hole 5 can be parallel to the mining direction of the working face 1, or in other words, the first drill cuttings monitoring hole 5 is parallel to the horizontal plane, which is the plane in the front-back direction and the left-right direction. The setting of the drill cuttings monitoring hole parallel to the horizontal plane is mainly to ensure the accuracy and reliability of the monitoring results.

[0048] Alternatively, the extension direction of the first monitoring drill cutting hole is parallel to the mining direction of the working face 1 and there is an angle between them. For example, under certain surrounding rock geological conditions, in order to avoid adverse factors such as faults and folds in the coal seam, the extension direction of the drill cutting hole may need to form a certain angle with the mining direction of the working face 1. Avoid adverse factors such as faults and folds in the coal seam from affecting the accuracy of drill cutting monitoring. In actual engineering, due to the influence of factors such as the layout of the working face 1 and the direction of the tunnel, the extension direction of the drill cutting hole may not be completely parallel to the mining direction of the working face 1, so the formation of an angle is inevitable. When the working face 1 is mined along the horizontal direction, and parallel opening can avoid the adverse effects of faults and folds in the coal seam, the drilling direction can be set to be parallel to the mining direction of the working face 1. When the mining direction of the working face 1 has a certain inclination with the horizontal plane, or in order to avoid the adverse effects of faults and folds in the coal seam, the extension direction of the first monitoring drill cutting hole can be parallel to the mining direction of the working face 1.

[0049] In some embodiments, a plurality of first drill cuttings monitoring holes 5 are arranged in the circumferential direction of the expansion and installation area 22 to monitor the entire expansion and installation area 22 .

[0050] In some embodiments, a second drill cuttings monitoring hole 6 is constructed in the two side areas of the working face 1, and a second drill cuttings monitoring hole 6 is constructed in the side of the tunnel within 100m close to the working face cutting eye 2, and the distance between the second drill cuttings monitoring hole 6 and the bottom plate in the vertical direction is a, 0.5m≤a≤1.5m.

[0051] Specifically, the two side areas can be understood as the transport tunnel 4 or the return air tunnel 3, and the second drill cuttings monitoring hole 6 is constructed, and special attention is paid to the tunnel side within 2100 meters close to the working face cut. This setting is to more accurately monitor the stress state and coal body stability in this area, so as to effectively predict and prevent safety risks such as rock burst. The second drill cuttings monitoring hole 6 is set in the two side areas of mining, that is, on both sides of the coal seam. The two side areas need to be excavated first during mining. The two side areas are areas with more obvious stress concentration, and are prone to accidents such as spalling and roof collapse. Therefore, it is necessary to construct a second drill cuttings monitoring hole 6 in the area close to the working face cut 2 in the two side areas to monitor the two side tunnels.

[0052] The distance between the second drill cuttings monitoring hole 6 and the bottom plate in the vertical direction is a, 0.5m≤a≤1.5m. This distance is set to ensure that the drill hole can avoid the rock layer of the bottom plate, while fully reflecting the stress state in the coal seam. If the distance a is too small, it may be affected by the rock layer of the bottom plate, resulting in a decrease in the accuracy of drill cuttings monitoring. If the distance a is too large, it may not accurately reflect the stress state of the coal seam near the bottom plate.

[0053] In some embodiments, the number of second drill cuttings monitoring holes 6 monitored each time in the conductive area 21 within 60m behind the expansion and security area 22 and within 100m in front of the expansion and security area 22 should be no less than 3, and the monitoring interval of the second drill cuttings monitoring holes 6 is 10m to 30m.

[0054] Specifically, the front of the expansion and safety area 22 is the direction in which the working face 1 is opening an eye, the back of the expansion and safety area 22 is the eye-cutting area 2 of the working face that was mined earlier than the expansion and safety area 22, and the eye-cutting area of ​​the working face 1 that is being excavated near the conductive area 21 is behind the expansion and safety area 22.

[0055] The 60m range behind the expansion area 22 is the distance immediately behind the expansion work after it is completed. Since the expansion work may change the original stress distribution, this area needs to be monitored intensively.

[0056] The conductive area 21 within 100m in front of the expansion area 22 is the front area where the expansion work is about to be carried out or is planned to be carried out, and this area is conductive with other parts of the coal seam, such as goafs, old tunnels, etc. Since the conductive area 21 may be affected by stress from other areas, such as drilling unloading, or stress shock or influence caused by underground actions such as support, it also needs to be monitored. By monitoring the drill cuttings in the area around the expansion area 22, it is convenient for operators to evaluate and predict the stability of the expansion area 22 and the risk of impact ground pressure through drill cuttings monitoring and other existing technologies, so as to decide whether to perform drilling unloading or strengthen support.

[0057] In some embodiments, the depth of the second drill cuttings monitoring hole 6 is t, the height of the tunnel is H, 3H≤t≤4H, and t≤15m. The depth t of the second drill cuttings monitoring hole 6 should not be less than three times the height H of the tunnel, that is, 3H≤t. This requirement ensures that the second drill cuttings monitoring hole 6 can penetrate far enough into the coal seam to reflect the stress state and coal body stability deep in the coal seam. If the hole depth is too shallow, it may not be possible to accurately capture stress changes deep in the coal seam. t≤4H, and t≤15m. These two upper limit conditions jointly limit the maximum depth of the monitoring hole. t≤4H is to avoid increasing construction difficulty and cost due to excessive hole depth, and t≤15m is based on practical considerations of the surrounding rock and monitoring technology around the tunnel, to avoid excessive drilling resulting in excessive monitoring range and reduced accuracy, and to ensure the reliability of monitoring.

[0058] In some embodiments, the monitoring interval of the second drill cuttings hole is 1 day to 3 days.

[0059] Specifically, the monitoring time of the second drill cuttings monitoring hole 6 in the conducting area 21 within 60m behind the expansion and safety area 22 and 100m in front of the expansion and safety area 22 is set to 1 day, the monitoring time of the second drill cuttings monitoring holes 6 in the transport lane 4 and the return air lane 3 is set to 1 day, and the monitoring time of the second drill cuttings monitoring holes 6 set in other areas is 2 days or three days, that is, the monitoring time of the remaining second drill cuttings monitoring holes 6 set in the remaining conducting areas 21, transport lane 4 and return air lane 3 is 2 days or three days, and the area of ​​the cut-eye near the expansion and safety area 22, the return air lane 3 area and the transport lane 4 area are focused on monitoring for 1 day, so as to timely discover and deal with potential safety hazards.

[0060] The remaining conductive areas 21 and the areas where the remaining second drilling cuttings monitoring holes 6 are set in the transport lane 4 and the return air lane 3 are relatively stable areas, and relatively stable areas use a longer monitoring time interval, that is, two or three days, to reduce monitoring costs and workload while ensuring monitoring effects. In order to meet the actual needs of coal mine safety production, operators are given time to provide support or pressure relief and other remedial measures.

[0061] In some embodiments, stress sensors are installed on the surrounding rock in the tunnel to monitor the disturbance to the surrounding rock during expansion and installation, so as to facilitate the monitoring of stress changes in the surrounding rock. For example, the stress state changes of the surrounding rock before and after expansion and installation can be used to determine the degree of influence of excavation on the stability of the surrounding rock, so as to support or relieve pressure on the corresponding disturbed area.

[0062] In some embodiments, when constructing the first drill cuttings monitoring hole 5 or the second drill cuttings monitoring hole 6, the first drill cuttings monitoring hole 5 or the second drill cuttings monitoring hole 6 is cleaned. The cleaning is to remove the rock cuttings, mud, water and other impurities generated during the drilling process to ensure that the monitoring hole is clean and avoid the influence of debris on the monitoring results, so as to accurately reflect the stress state of the surrounding rock and the stability of the coal body.

[0063] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0064] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0065] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a 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, a first feature being "above", "above" or "above" a 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. A first feature being "below", "below" or "below" a 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.

[0067] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean 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 present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics 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.

[0068] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for arranging drill cuttings monitoring during rock burst mine expansion, characterized in that: include: When the working face is cut, expansion and security excavation is carried out to divide the cutting area of ​​the working face into a conduction area and an expansion and security area; Constructing a plurality of first drill cuttings monitoring holes in the area of ​​expansion and excavation, with any two adjacent drill cuttings monitoring holes being spaced apart; When excavating in the expansion area, the number of the first drilling cuttings monitoring holes is determined by presetting the area of ​​the expansion area to be excavated.

2. The method for monitoring rock burst during mine expansion and installation by drill cuttings method according to claim 1, characterized in that: The cutting area of ​​the working face is divided into strong impact area, weak impact area and non-impact area. If the security expansion area is in a strong impact area, the 10m 2 ~15m 2 Two first cuttings monitoring holes are arranged inside. If the expansion area is in a weak impact area, the 15m 2 ~20m 2 Two first cuttings monitoring holes are arranged inside. If the expansion area is in a non-impact area, the 15m 2 ~20m 2 A first drill cuttings monitoring hole is arranged inside.

3. The method for monitoring rock burst during mine expansion and installation by drill cuttings method according to claim 2, characterized in that: When constructing the first drill cuttings monitoring hole in the expansion area, the extension direction of the first monitoring drill cuttings hole is parallel to the mining direction of the working face, or there is an angle between the extension direction of the first monitoring drill cuttings hole and the mining direction of the working face.

4. The method for monitoring rock burst during mine expansion and installation by drill cuttings method according to claim 3, characterized in that: A plurality of first drill cuttings monitoring holes are arranged in the circumferential direction of the expansion area.

5. The method for monitoring rock burst during mine expansion and installation by drill cuttings method according to claim 1, characterized in that: A second drill cuttings monitoring hole is constructed in the two side areas of the working face mining, and a second drill cuttings monitoring hole is constructed in the side of the tunnel within 100m of the working face cutting eye. The distance between the second drill cuttings monitoring hole and the bottom plate in the vertical direction is a, 0.5m≤a≤1.5m.

6. The method for monitoring rock burst during mine expansion and installation by drill cuttings method according to claim 5, characterized in that: The number of second drill cuttings monitoring holes monitored each time in the conductive area within 60m behind the expansion and safety area and within 100m in front of the expansion and safety area should be no less than 3, and the monitoring interval between the second drill cuttings monitoring holes should be 10m to 30m.

7. The method for monitoring rock burst during mine expansion and installation by drill cuttings method according to claim 6, characterized in that: The depth of the second drill cuttings monitoring hole is t, the height of the excavation tunnel is H, 3H≤t≤4H, and t≤15m.

8. The method for monitoring rock burst during mine expansion and installation by drill cuttings method according to claim 6, characterized in that: The monitoring interval of the second drilling cuttings hole is 1 day to 3 days.

9. The method for monitoring rock burst during mine expansion and installation by drill cuttings method according to claim 1, characterized in that: Stress sensors are installed on the surrounding rock in the tunnel to monitor the disturbance to the surrounding rock during expansion and installation.

10. The method for monitoring rock burst during mine expansion and installation by drill cuttings method according to claim 7, characterized in that: When constructing the first drill cuttings monitoring hole or the second drill cuttings monitoring hole, the first drill cuttings monitoring hole or the second drill cuttings monitoring hole is cleaned.

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