An up-and-down combined prevention and control system and method for mine earthquake or rock burst

Abstract

The application provides a well up and down combined prevention and control system and method for mine earthquake or rock burst, and belongs to the related technical field of mine rock burst disaster prevention and control. The well up and down combined prevention and control system is provided by setting an uphole rock burst prevention system and a downhole rock burst prevention system, wherein the uphole rock burst prevention system carries out gas extraction through a recovery pipe after fracturing, simultaneously carries out gas pressure monitoring, provides a basis for rock burst and mine earthquake prediction, and the injected concrete can play a certain adhesion and buffering effect on the fractured hard roof rock stratum, thereby preventing the risk of large-area collapse; the downhole rock burst prevention system adopts a segmented divergent setting of a strong anchor rod and is provided with stress and angle monitoring sensors, thereby further providing a basis for rock burst and mine earthquake prediction. The prevention and control measures are clear in purpose, and can realize double prevention and control from the source and the end of rock burst and mine earthquake disasters.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mine rock burst disaster prevention and control, and particularly relates to a combined prevention and control system and method for mine shock or rock burst. BACKGROUND

[0002] Mine shock, also known as mine earthquake, refers to earthquake activity caused by mining of the ground or shallow layer of several hundred meters or deep layer of thousands of meters; rock burst is a mine disaster, which is a dynamic phenomenon of mine pressure occurring in high-stress roadway and surrounding rock of mining face, characterized by sudden, sharp and violent destruction, which can cause roadway damage, equipment damage, personnel casualties and other accidents. The main coal-producing areas have hard rock roof occurrence, and with the increase of underground mining area, the breaking and rotation of thick hard key layer during the mining process of working face can cause mine shock, which can cause damage to underground mining roadway, ground and buildings, and seriously threaten the safety production of coal mines.

[0003] The disaster source of hard roof collapse type mine shock and rock burst is the hard roof above the mining area. At present, for such disasters, mainly through fracturing the hard roof from the ground and underground, or strengthening the roadway support, so as to eliminate or reduce the harm of mine shock and rock burst. However, the prevention and control of mine shock and rock burst focuses on eliminating the source and controlling the end, therefore, the Chinese patent application with publication number CN110792419B discloses a coal mine rock burst advanced prevention and control method, selects ground fracturing control technical means and underground pre-fracturing control technical parameters, and completes the advanced fracturing weakening of the rock stratum, however, the prevention and control effect still cannot meet the actual demand, the main reasons are as follows: 1. The prediction only determines the impact tendency of the coal rock mass before the coal seam mining through coring, and the accuracy needs to be further improved; 2. After fracturing, no further treatment is made, and although the risk of rock burst is reduced during the coal seam mining process, the risk of top collapse is increased; 3. The influence of ground subsidence caused by construction process is not considered.

[0004] Therefore, the prior art needs to be further improved, and thus the present application is proposed. SUMMARY

[0005] In view of the above problems existing in the prior art, the present application provides a combined prevention and control system and method for mine shock or rock burst, which is used for the disaster prevention and control of hard roof collapse type mine shock and rock burst, and the purpose is to effectively prevent and control the harm of hard roof collapse type mine shock and rock burst to underground mining roadway and surface of goaf through reasonable combined prevention and control measures of the ground and underground, improve the disaster prevention and control accuracy and efficiency, and enhance the disaster prevention and control effect of mine shock and rock burst.

[0006] In order to achieve the above technical purpose, the present application adopts the following technical scheme:

[0007] A well up and down combined prevention and control system for mine earthquake or rock burst, comprising a well up rock burst prevention system and a well down roadway rock burst prevention system, wherein,

[0008] The well up rock burst prevention system comprises a ground rock burst prevention device, a vertical pressure injection pipe, a horizontal pressure injection pipe and a transverse grouting pipe, the ground rock burst prevention device is located on the ground, the vertical pressure injection pipe extends underground from the ground rock burst prevention device to a hard roof rock layer above the coal seam, and a horizontal pressure injection pipe in communication with the vertical pressure injection pipe is formed in the hard roof rock layer, and a transverse grouting pipe is arranged at at least one rock interface near the hard roof rock layer above the hard roof rock layer, wherein the horizontal pressure injection pipe is used for fracturing construction, grouting reinforcement and gas extraction of the hard roof rock layer, and a recovery pipe is arranged in the horizontal pressure injection pipe during gas extraction, and the transverse grouting pipe is used for grouting and filling the gap at the rock interface above the hard roof rock layer;

[0009] The well down roadway rock burst prevention system comprises an initial roadway after the expansion of a roadway section, and the initial roadway is surrounded by surrounding rock, a plurality of strong anchor rods are arranged in the surrounding rock outside the initial roadway and diverge from the initial roadway, a buffer layer is formed inside the initial roadway, a buffer material is arranged at the buffer layer, and the buffer layer is supported by a strong support to form a final roadway.

[0010] Compared with the prior art, the present application has at least the following beneficial effects:

[0011] 1、After the fracturing is completed, the broken hard roof rock layer is organically connected together by the formation of honeycomb concrete inside and outside the horizontal pressure injection pipe, and the stress concentration caused by the mine earthquake and rock burst can be greatly eliminated by the characteristics of the honeycomb concrete, such as light quality, low elastic modulus, easy deformation, good absorption and dispersion effect on impact load, etc., and at the same time, even if local rock burst occurs, the whole formed by the horizontal pressure injection pipe and the honeycomb concrete can prevent the collapse of broken rocks in the remaining areas outside the rock burst area, reducing the risk of large area collapse accidents;

[0012] 2、By sharing the pipeline with the vertical pressure injection pipe, the transverse grouting pipe is extended to fill the filling material in the overburden gap above the hard rock layer, the integrity of the rock layer is enhanced, and the movement space is reduced, thereby reducing the risk of sudden subsidence of the ground caused by the hard roof rock layer impact pressure;

[0013] 3、The setting of the honeycomb concrete also plays a role in facilitating the entry of gas into the horizontal pressure injection pipe, which is conducive to gas extraction using the recovery pipe, avoiding the accumulation of gas in the hard roof rock layer, leading to stress concentration and causing the risk of mine earthquake, rock burst and hard roof rock layer collapse;

[0014] 4、The setting of the safety production valve can avoid the outflow of gas fluid from the underground when the mine earthquake and rock burst occur;

[0015] 5. The surface anti-rockburst system and the underground anti-rockburst system are deployed independently, but during operation, they are organically combined by collecting data from both, so as to achieve timely prediction of mine tremors and rock bursts. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a schematic diagram of the overall structure of the longwall mining system used in this invention.

[0018] Figure 2 yes Figure 1 The diagram shows the structural schematic of the anti-scouring measures for section AA.

[0019] Figure 3 yes Figure 1 The diagram shows the structural schematic of the anti-scouring measures for section BB.

[0020] Figure 4 yes Figures 2-3 A schematic diagram of the arrangement of horizontal injection pipes in the rigid top slab layer shown.

[0021] Figure 5 yes Figure 4 A partial enlarged view of the gas drainage pipeline shown;

[0022] Figure 6 yes Figure 5 The diagram shows the structure of the safety production valve.

[0023] Figure 7 This is a structural diagram of the underground roadway anti-scour system.

[0024] Figure 8 yes Figure 7 A partial structural diagram of the anchor bolt shown;

[0025] Among them, 1-section return airway, 2-coal mining face, 3-goaf, 4-section transport airway, 5-cutting hole, 6-hard roof strata, 7-surface anti-scour equipment, 8-vertical injection pipe, 9-horizontal injection pipe, 10-transverse grouting pipe, 11-filling material, 12-underground roadway anti-scour system.

[0026] 901-Outer tube, 902-Inner tube, 903-Fissure, 904-Harvesting tube, 905-Support and isolation device, 9041-Screen, 9042-Main body of the harvesting tube, 9043-Pressure detection unit, 9044-Safety valve, 441-Valve bottom, 442-Spring, 443-Valve plate, 444-Valve cover

[0027] 101 - strong support, 102 - strong anchor, 103 - buffer layer, 1021 - first segment, 1022 - second segment, 1023 - stress and angle coupling sensor. Embodiments

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] As Figures 1-8 shown, the present application provides a combined prevention and control system for mine shock or rock burst, which comprises an uphole rock burst prevention system and a downhole roadway rock burst prevention system 12, wherein,

[0030] The uphole rock burst prevention system comprises a ground rock burst prevention device 7, a vertical pressure injection pipe 8, a horizontal pressure injection pipe 9 and a transverse grouting pipe 10, the ground rock burst prevention device 7 is located on the ground, the vertical pressure injection pipe 8 extends from the ground rock burst prevention device 7 to the hard roof rock layer 6 above the coal seam underground, and the horizontal pressure injection pipe 9 in communication with the vertical pressure injection pipe 8 is formed in the hard roof rock layer 6, and the transverse grouting pipe 10 is arranged at at least one rock layer interface near the hard roof rock layer 6 above the hard roof rock layer 6, wherein the horizontal pressure injection pipe 9 is used for fracturing construction, grouting reinforcement and gas extraction of the hard roof rock layer 6, and a recovery pipe 904 is arranged in the horizontal pressure injection pipe 9 during gas extraction, and the transverse grouting pipe 10 is used for grouting and filling the gap at the rock layer interface above the hard roof rock layer 6;

[0031] The downhole roadway rock burst prevention system 12 comprises an initial roadway after the roadway section is expanded, the initial roadway is surrounded by surrounding rock, a plurality of strong anchors 102 are arranged in the surrounding rock outside the initial roadway and diverge from the initial roadway, a buffer layer 103 is formed inside the initial roadway, a buffer material is arranged at the buffer layer 103, and the buffer layer 103 is supported by a strong support 101 to form a final roadway. The final roadway includes but is not limited to a section return air roadway 1, a section transportation roadway 4, a open-off cut 5 and other mining roadways, and in the advancing process of the coal mining face 2, the goaf 3 is continuously expanded, and the above roadways can be switched.

[0032] It should be noted that the present application can effectively prevent and control the occurrence of rock burst and greatly reduce the damage caused by rock burst and mine shock to underground and ground by deploying the measures for preventing and controlling rock burst, and the prevention and control principle is that: the hard roof rock layer 6 is hydraulically fractured (through the horizontal pressure injection pipe 9) through the ground drilling (vertical pressure injection pipe 8), the integrity of the hard rock layer is reduced, the hard rock layer is converted from sudden large-scale fracture to slow small-scale fracture, and the size of the broken block is small, thereby reducing the impact on the lower mining roadway; on this basis, in the underground roadway, the roadway is prevented and controlled from outside to inside through the three measures of strong anchor rod 102, buffer layer 103 and strong support 101, and a protection system for the roadway is established; further, in order to prevent the sudden subsidence of the overburden rock in the goaf, the horizontal grouting pipe 10 is extended through the pipe shared with the vertical pressure injection pipe 8, the gap at the interface of the hard roof rock layer 6 and the overburden rock layer above the hard roof rock layer 6 is filled with filling material, the integrity of the rock layer is enhanced and the movement space is reduced, so as to reduce the danger of sudden subsidence of the ground. The present application realizes effective prevention and control of hard roof collapse type mine shock and rock burst disaster by the combined application of various measures for preventing and controlling rock burst, and in addition, the underground and overground measures for preventing and controlling rock burst are arranged separately, the independent arrangement of the two can reduce the mutual influence of rock burst prevention and production to a certain extent, and is beneficial to the improvement of production efficiency.

[0033] In order to better achieve the purpose of the present application, see Figure 4As shown, the horizontal pressure injection pipe 9 of the present application comprises an outer pipe 901 and an inner pipe 902, which are fixedly connected (for example, through a connecting ring, or a sectional connection through a connecting joint, which is a prior art and will not be described here) and form a gap between the outer pipe 901 and the inner pipe 902, wherein the outer pipe 901 is a screen pipe with passages to the hard roof rock layer 6 outside the horizontal pressure injection pipe 9, and the outer pipe 901 and the inner pipe 902 are also formed with perforation channels through perforation operation, which are connected to the fissure 903 inside the inner pipe 902, and the fissure 903 is formed in the hard roof rock layer 6 outside the horizontal pressure injection pipe 9 through the perforation operation. Through such arrangement, the inner side of the inner pipe 902 of the horizontal pressure injection pipe 9 is connected to the hard roof rock layer 6, which facilitates fracturing construction, grouting reinforcement, and subsequent gas extraction operations through the inner pipe 902 of the horizontal pressure injection pipe 9. During gas extraction, the recovery pipe 904 is installed inside the inner pipe 902. It should be noted that the perforation operation can be performed by lowering a perforation tool into the inner side of the inner pipe 902, and the fracturing construction, grouting reinforcement, and subsequent gas extraction operations are performed after the perforation tool is retrieved. (The specific perforation method is a prior art and will not be described here.) Further, the well anti-collision system of the present application also comprises honeycomb concrete formed in the fissure 903 and the gap between the outer pipe 901 and the inner pipe 902, and the recovery pipe 904 is supported inside the inner pipe 902 by a plurality of support isolation devices 905 distributed along the extension direction of the horizontal pressure injection pipe 9, and two adjacent support isolation devices 905 are respectively arranged on both sides of the corresponding perforation channel.

[0034] Through the above arrangement, at least the following beneficial effects are achieved:

[0035] The cellular concrete is formed between the outer tube 901 and the inner tube 902, and when gas mining is performed subsequently, gas such as gas can enter the recovery tube 904 conveniently, meanwhile, since the perforation hole connects the inner side of the inner tube 902 to the fissure 903 formed at the corresponding hard roof rock layer 6, the concrete between the outer tube 901 and the inner tube 902 of the horizontal pressure injection tube 9 is integrated with the concrete of the fissure 903, so that the risk of roof collapse can be reduced while the harm of mine shock and rock burst is eliminated, the reason is that the hard roof rock layer 6 is broken by hydraulic fracturing, and the integrity of the hard roof rock layer 6 is reduced, and the injected concrete strings up the broken hard roof rock layer 6, since there is a large difference between the material of the cellular concrete and the material of the hard roof rock layer 6 itself, the cellular concrete is light and has a low elastic modulus, and is easy to deform, so that it has a good absorption and dispersion effect on impact load; it is just like tempered glass, after the glass is broken, the fragments do not fall; the present application organically connects the broken hard roof rock layer 6 by the cellular concrete, and the risk of roof collapse can be reduced while the integrity of the hard roof rock layer 6 is reduced (by hydraulic fracturing). Preferably, the concrete of the present application is mixed by a foaming agent and concrete, and the foaming agent is preferably ZML-1 foaming agent, and the formula of the foaming agent mainly includes sodium dodecyl sulfate (4 g / L) + dodecanol (0.7 g / L) + hydroxyethyl cellulose (1.8 g / L) + triethanolamine (6 g / L).

[0036] Here, the formation process of the cellular concrete of the present application will be briefly described, first, corresponding drilling is performed, then the horizontal pressure injection tube 9 including the outer tube 901 and the inner tube 902 is lowered to the specified position of the drilling, then the perforating tool is lowered to perform perforating operation, the perforation hole is formed on the outer tube 901 and the inner tube 902, and the fissure 903 is formed on the corresponding hard roof rock layer 6, then the perforating tool is retrieved, and the fracturing operation is performed to further expand the fissure 903 and form the fracturing cracks around the fissure 903; after the fracturing is completed, the concrete with foaming agent is extruded into the drilling through the inner tube 902, and the cellular concrete is formed in the horizontal pressure injection tube 9, then the cellular concrete inside the inner tube 902 is drilled out by the drilling tool, the recovery tube 904 is lowered, and the support isolation device 905 is arranged at the specified position. More preferably, after the cellular concrete inside the inner tube 902 is drilled out and before the recovery tube 904 is lowered, the pressure build-up extrusion is performed through the inner tube 902, for example, 10 MPa of clean water is injected into the inner tube 902, then the pressure change is observed, if the pressure gradually decreases and the decreasing rate reaches the construction requirement, the operation is completed, if the pressure does not decrease, the pressure is further increased, the purpose is to overcome the blockage caused by the extrusion of the drilling tool, so that the inner side of the inner tube 902 is connected to the outer side of the outer tube 901.

[0037] It should be noted that in existing technologies, no further treatment is generally performed after fracturing. However, in actual construction, since fracturing is carried out on a hard roof stratum 6, and the coal seam below contains gases such as methane, as the methane is continuously desorbed from the coal seam, it accumulates at the hard roof stratum 6, causing stress changes at the hard roof stratum 6. The already fractured hard roof stratum 6 is prone to collapse under this pressure accumulation. This invention uses grouting reinforcement after fracturing to form honeycomb concrete. On the one hand, it connects the fractured hard roof stratum 6, reducing the risk of roof collapse. On the other hand, it facilitates subsequent gas extraction. Gas extraction can prevent the accumulation of methane gas in the hard roof stratum 6, which would cause stress changes and trigger collapse of the hard roof stratum 6. Therefore, it can further reduce the risk of collapse of the hard roof stratum 6 and effectively reduce the probability of mine tremors. In addition, the outer tube 901 of the present invention is a screen tube. Therefore, except for the perforation channels on it, the other positions of the outer tube 901 can also be connected to the hard roof rock layer 6. This makes it easier for gas to enter the inner tube 902 through the honeycomb concrete. The outer tube 901, the inner tube 902 and the honeycomb concrete form a whole, which improves the connection reliability between the horizontal injection pipe 9 and the hard roof rock layer 6.

[0038] Further, see Figures 5-6 The harvesting pipe 904 of the present invention includes a harvesting pipe body 9042 and a screen 9041. The screen 9041 is sleeved on the outside of the harvesting pipe body 9042. A plurality of pressure detection units 9043 are installed on the outer wall of the harvesting pipe body 9042. A plurality of safety production valves 9044 communicating with the inside and outside of the harvesting pipe body 9042 are provided on the harvesting pipe body 9042. The inner side of the harvesting pipe body 9042 is a harvesting channel. The pressure detection units 9043 are located on the outer wall of the harvesting pipe body 9042, and the detected pressure data can more quickly reflect the gas pressure situation, and they can be protected by the screen 9041.

[0039] In addition, the present application has the following beneficial effects: in actual production process, the prediction of rock burst is very difficult, compared with earthquake, the range of rock burst is smaller, and the energy is smaller compared with earthquake, so the prediction is more difficult, although the present application cannot realize the early prediction of mine earthquake and rock burst, but like earthquake prediction, through the technical scheme of the present application, timely prediction after the occurrence of mine earthquake and rock burst can be realized; this is because, the present application uses the horizontal pressure injection pipe 9 arranged in the hard roof rock stratum 6 to carry out gas extraction, a plurality of pressure detection units 9043 are installed on the outer side wall of the recovery pipe main body 9042, once the mine earthquake or rock burst occurs at the hard roof rock stratum 6, the pressure detection unit 9043 can quickly capture the change and transmit the change to the ground rock burst prevention equipment 7 or the communication alarm equipment located in the roadway, so as to achieve the prediction of mine earthquake or rock burst.

[0040] Further, the safety production valve 9044 of the present application includes a valve bottom 441, a valve cover 444, a valve plate 443 and a spring 442, the valve bottom 441 and the valve cover 444 are both provided with fluid passages, one end of the spring 442 is arranged in the middle recess of the valve bottom 441 (the fluid passage is located in the middle of the middle recess), and the other end tightly presses the valve plate 443 below the valve cover 444. Initially, the valve plate 443 tightly blocks the fluid passage of the valve cover 444 under the action of the spring 442, when the pressure increases, the safety production valve 9044 is opened and starts production automatically, when the mine earthquake or rock burst occurs and the local gas pressure increases rapidly, the valve plate 443 can quickly close above the valve bottom 441 to avoid the high-pressure gas from the underground to the ground.

[0041] Further, the strong anchor rod 102 is arranged in a segmented manner, which at least includes a first segment 1021 and a second segment 1022 (of course, there can be many segments), a stress and angle coupling sensor 1023 (the stress and angle coupling sensor 1023 is a general term of stress sensor and angle sensor, which are coupled and assembled together to facilitate installation) is arranged at the connecting position of the first segment 1021 and the second segment 1022. Through the segmented arrangement, the lengthening of the anchor rod can be facilitated to meet the demand of super-long anchor rod, at the same time, the segmented arrangement provides a basis for the arrangement of the sensor, such as Figure 8As shown, at this time, the sensor is arranged at the connecting position of the first segment 1021 and the second segment 1022, the first segment 1021 has a groove at the connecting position, the second segment 1022 is inserted into the groove, and the stress and angle coupling sensor 1023 is arranged in the groove between the radial interfaces of the first segment 1021 and the second segment 1022, so that the mine earthquake and rock burst can be sensed in time. Since the segmented arrangement is adopted, the length of the strong anchor rod 102 can be very long, for example, several dozen meters or even hundreds of meters. Since the strong anchor rod 102 is arranged in a divergent manner, many strong anchor rods 102 are arranged in different rock strata. When the mine earthquake or rock burst occurs, the first segment 1021 and the second segment 1022 will deviate, and these data can be quickly captured by the stress and angle coupling sensor 1023 through the stress and deflection angle, so as to provide a basis for timely prediction of the mine earthquake or rock burst.

[0042] As a preferred embodiment, the present application also provides a combined prevention and control method in the well, which is realized based on the above-mentioned combined prevention and control system in the well for the mine earthquake or rock burst, and includes the following steps:

[0043] S1, arranging the rock burst prevention system in the well;

[0044] S2, arranging the rock burst prevention system in the well;

[0045] S3, using the data collected by the rock burst prevention system in the well and the rock burst prevention system in the well to predict the mine earthquake and rock burst, wherein the step S1 and the step S2 are independently arranged and do not affect each other, and the sequence is not limited.

[0046] Preferably, the step S1 specifically includes:

[0047] S11, drilling downward from the ground rock burst prevention equipment 7 by the drilling equipment to form the vertical drill hole, the horizontal drill hole and the horizontal drill hole in the hard roof rock stratum 6, and then arranging the vertical injection pipe 8, the horizontal grouting pipe 10 and the horizontal injection pipe 9 in the vertical drill hole, the horizontal drill hole and the horizontal drill hole, respectively;

[0048] S12, closing the horizontal grouting pipe 10 (a corresponding valve can be arranged, which is not described here), using the perforating tool column to lower the perforating tool into the horizontal injection pipe 9, and performing segmented perforation on the hard roof rock stratum 6 where the horizontal injection pipe 9 is located, taking back the perforating tool after the perforation is completed, and using the fracturing equipment to pump the fracturing fluid from the ground rock burst prevention equipment 7 to perform the fracturing operation;

[0049] S13, after the fracturing, the concrete slurry with foaming agent is injected through the horizontal pressure injection pipe 9, in this step, the amount of the concrete slurry with foaming agent is controlled, so that the liquid level of the concrete slurry with foaming agent is within a certain range below the top boundary of the hard roof rock layer 6 in the vertical direction, and then the setting is waited, and the honeycomb concrete is formed inside and outside the horizontal pressure injection pipe 9;

[0050] S14, the transverse grouting pipe 10 is opened, the space at the rock layer interface above the hard roof rock layer 6 is grouted and filled, and the filling material 11 is filled, the filling material 11 injected in this step is preferably concrete slurry without foaming agent, and the grouting and filling of the space at the rock layer interface is mainly to reduce the risk of surface subsidence, and can also avoid further upward diffusion of gas; since the hard roof rock layer 6 is broken under the action of perforation and fracturing, the desorbed gas is easy to gather at the hard roof rock layer 6, and the concrete slurry after grouting and filling can prevent the upward diffusion of gas;

[0051] S15, the honeycomb concrete inside the inner pipe 902 of the horizontal pressure injection pipe 9 is drilled out by the drilling tool, the recovery pipe 904 is lowered, and the support isolation device 905 is arranged at the specified position.

[0052] Further, the data acquisition in step S3 includes but is not limited to acquiring the gas pressure at the hard roof rock layer 6 by using the plurality of pressure detection units 9043 installed on the outer side wall of the recovery pipe main body 9042, and acquiring the stress change and the anchor rod angle change at the corresponding position by using the stress and angle coupling sensor 1023.

[0053] The prediction of the mine earthquake and the rock burst by using the collected data in step S3 includes that the abnormal fluctuation is obtained according to the collected data, the abnormal fluctuation refers to the sudden increase or decrease of the data, and the prediction of the mine earthquake and the rock burst is performed according to the position and size of the abnormal fluctuation.

[0054] It should be noted that the uphole and downhole rock burst prevention systems are arranged independently of each other, but in the subsequent production stage, the collected data includes the gas pressure fluctuation at the hard roof rock layer 6 and the stress and angle change on the strong anchor rod 102, the data can be obtained in time at the far end of the roadway, and thus the timely prediction of the mine earthquake or the rock burst can be realized.

[0055] Finally, it should be noted that, in the present document, relational terms such as "first" and "second", and the like can be used solely to distinguish one entity or action from another entity or action, without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0056] The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein can be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A combined well up and down prevention and control system for mine earthquake or rock burst, comprising a well up rock burst prevention system and a well down roadway rock burst prevention system (12), characterized in that, The wellhead anti-burst system comprises a ground anti-burst device (7), a vertical pressure injection pipe (8), a horizontal pressure injection pipe (9) and a transverse grouting pipe (10), the ground anti-burst device (7) is located on the ground, the vertical pressure injection pipe (8) extends underground from the ground anti-burst device (7) to a hard roof rock layer (6) above the coal seam, and the horizontal pressure injection pipe (9) is formed in the hard roof rock layer (6) and communicates with the vertical pressure injection pipe (8), the transverse grouting pipe (10) is arranged at at least one rock layer interface above the hard roof rock layer (6) and adjacent to the hard roof rock layer (6), wherein the horizontal pressure injection pipe (9) is used for fracturing construction, grouting reinforcement and gas extraction of the hard roof rock layer (6), a recovery pipe (904) is arranged in the horizontal pressure injection pipe (9) during gas extraction, and the transverse grouting pipe (10) is used for grouting and filling the gap at the rock layer interface above the hard roof rock layer (6); the underground roadway anti-burst system (12) comprises an initial roadway after the roadway section is expanded, and the initial roadway is surrounded by surrounding rock, a plurality of strong anchor rods (102) are arranged on the surrounding rock outside the initial roadway and divergently distributed from the initial roadway, a buffer layer (103) is formed on the inner side of the initial roadway, a buffer material is arranged at the buffer layer (103), and the buffer layer (103) is supported by a strong support (101) to form a final roadway. The horizontal pressure injection pipe (9) comprises an outer pipe (901) and an inner pipe (902), the outer pipe (901) and the inner pipe (902) are fixedly connected, and a gap is formed between the outer pipe (901) and the inner pipe (902), wherein the outer pipe (901) is a screen pipe, and passages communicating with the hard roof rock layer (6) outside the horizontal pressure injection pipe (9) are distributed on the outer pipe (901), and the outer pipe (901) and the inner pipe (902) are further formed with perforation channels communicating the inside of the inner pipe (902) with the fissure (903) through a perforation operation. The wellhead anti-burst system further comprises honeycomb concrete formed in the fissure (903) and the gap between the outer pipe (901) and the inner pipe (902), and the recovery pipe (904) is supported inside the inner pipe (902) through a plurality of support isolation devices (905) distributed along the extension direction of the horizontal pressure injection pipe (9), and the two adjacent support isolation devices (905) are respectively arranged on the two sides of the corresponding perforation channel.

2. The system for preventing and controlling mine earthquake or rock burst in the well according to claim 1, characterized in that, The recovery pipe (904) comprises a recovery pipe body (9042) and a screen (9041), the screen (9041) is sleeved outside the recovery pipe body (9042), a plurality of pressure detection units (9043) are installed on the outer side wall of the recovery pipe body (9042), a plurality of safety production valves (9044) communicating the inside and outside of the recovery pipe body (9042) are arranged on the recovery pipe body (9042), and the inside of the recovery pipe body (9042) is a recovery channel.

3. The system for preventing and controlling mine earthquake or rock burst in the well according to claim 2, characterized in that, The safety production valve (9044) comprises a valve bottom (441), a valve cover (444), a valve plate (443) and a spring (442), fluid passages are arranged on the valve bottom (441) and the valve cover (444), one end of the spring (442) is arranged in a middle recess of the valve bottom (441), the fluid passage of the valve bottom (441) is located in the middle of the middle recess, and the other end of the spring (442) tightly presses the valve plate (443) below the valve cover (444).

4. The system for preventing and controlling mine earthquake or rock burst from the upper and lower well combination of claim 1-3, characterized in that, The strong anchor rod (102) is in a segmented mode and comprises at least a first segment (1021) and a second segment (1022), and a stress and angle coupling sensor (1023) is arranged at a connecting position of the first segment (1021) and the second segment (1022).

5. A method for preventing and controlling mine earthquake or rock burst in the well, characterized in that, The method is based on the system for combined prevention and control of mine earthquake or rock burst on and under well.

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