Rock burst prevention device and method under large buried depth and complex conditions

Abstract

This invention discloses a device and method for preventing rockburst under complex conditions at great depths, relating to the field of coal mining technology. It includes: multiple sets of first boreholes spaced apart along the length of the roadway and opened in the roadway roof, each set containing two symmetrically arranged first boreholes; multiple sets of second boreholes spaced apart along the length of the roadway and opened in the roadway floor, each set containing two symmetrically arranged second boreholes; a guide assembly corresponding to the opening of the first or second borehole; a jet rod that can be fed into the first or second borehole through the guide assembly, the end of the jet rod being connected to a jet cutting head, the jet cutting head being capable of performing cross-shaped slit treatment; the continuity and interconnectivity of the cross-shaped slits extend the pressure relief range from local to regional, significantly improving the stress release effect.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, specifically to a device and method for preventing rockbursts under complex conditions at great burial depths. Background Technology

[0002] In deep underground engineering projects such as coal mines, rockbursts are a typical dynamic disaster, essentially caused by the intense and sudden release of elastic strain energy accompanied by a high concentration of stress within the rock mass. The formation of a high-stress environment at great depths stems from the combined effects of the load from the thick overlying rock strata, the residual stress from complex geological structures, and the heterogeneity of the rock layers. This high-stress environment easily leads to localized stresses exceeding the rock mass's bearing capacity, thereby inducing rockbursts and posing a serious threat to mine safety and the lives of personnel.

[0003] Current methods for preventing rockbursts mainly rely on pressure relief and support, but their effectiveness is significantly limited.

[0004] Commonly used methods such as blasting and hydraulic fracturing rely primarily on creating single or a limited number of discontinuous fractures to release localized stress. However, the effect of a single fracture is limited to a small area around the borehole; the fractures are discontinuous and isolated from each other, making it difficult to form a continuous stress release channel. As a result, the stress relief area is incomplete, and the original stress concentration zone is not effectively eliminated. Under sustained high ground pressure at depth, residual stress can easily accumulate again to a critical state, triggering a recurrence of rockbursts.

[0005] Traditional anchor bolts and cables often focus on local reinforcement of a single rock layer, neglecting the synergistic effect of deformation on the top and bottom plates. While passive coordination using rigid connectors aims to transfer stress, they are prone to breakage or loosening under conditions of large and rapid deformation in deep rock strata because they cannot adapt to significant deformation differences, ultimately losing their effective stress transmission capacity.

[0006] Therefore, it is necessary to provide a device and method for preventing rockbursts under complex conditions with great burial depth to solve the above problems. Summary of the Invention

[0007] To address the aforementioned problems, the present invention provides the following technical solution: a device for preventing rockburst under complex conditions of great burial depth, comprising: multiple sets of first boreholes spaced apart along the length of the roadway and drilled in the roof of the roadway, each set including two symmetrically arranged first boreholes; multiple sets of second boreholes spaced apart along the length of the roadway and drilled in the floor of the roadway, each set including two symmetrically arranged second boreholes; a guide assembly corresponding to the opening of the first borehole or the opening of the second borehole; a jet rod that can be fed into the first borehole or the second borehole through the guide assembly, the end of the jet rod being connected to a jet cutting head, the jet cutting head being capable of performing cross-shaped slit treatment; the guide assembly including an attachment frame for attaching to the roof or floor of the roadway, the attachment frame being provided with a sealing sleeve.

[0008] Preferably, the jet cutting head includes: an inlet rod, one end of which is connected to the jet rod and the other end of which is connected to an outlet seat, the end of the outlet seat away from the inlet rod being hemispherical; and a spherical chamber, which is fitted onto the hemispherical surface of the outlet seat, the end of the spherical chamber near the outlet seat having an inlet, and the other end extending outward and integrally forming the jet head.

[0009] Preferably, a locking seat is slidably disposed on the outside of the liquid outlet seat, and the top of the locking seat has an opening to avoid the jet head; four rollers arranged in a circumferential array are rotatably disposed in the locking seat; a limiting block is fixed on the outer surface of the liquid outlet seat, and the limiting block is slidably connected to the locking seat for limiting; a locking bladder is disposed between the bottom of the limiting block and the locking seat, and when the locking bladder is inflated, it can drive the locking seat to move downward.

[0010] Preferably, a positioning seat is fixedly sleeved on the outside of the liquid inlet rod, the positioning seat is slidably connected to the locking seat, and a reset member is connected between the positioning seat and the locking seat.

[0011] Preferably, two concentrically arranged sealing gaskets are also fixed on the upper surface of the liquid outlet seat.

[0012] Preferably, after the cross-shaped slit treatment is completed, the jet rod and jet cutting head are removed and the grouting rod is inserted. At this time, an elastic coupling component is provided at the end of the guide component away from the grouting rod, and the two corresponding elastic coupling components are connected by a connecting frame.

[0013] Preferably, the elastic coupling assembly includes: a support rod, one end of which is connected to the connecting frame and the other end of which is connected to a support base; a mounting base, which is fixed on the support base and has a through hole in the middle; an elastic element, which is disposed in the through hole; and a coupling rod, one end of which contacts the elastic element and the other end of which extends into the sealing sleeve and is threadedly connected to the grouting rod.

[0014] Preferably, a spring is fitted around the coupling rod, and the spring is located between the sealing sleeve and the mounting base.

[0015] This invention also provides a method for preventing rockbursts under complex conditions with great burial depth, which includes the following steps:

[0016] S1. Multiple sets of first and second boreholes are opened at intervals along the length of the roadway in the roof and floor slabs, respectively.

[0017] S2. Install the guide assembly at the opening of the first borehole and the second borehole respectively, and feed the jet rod and jet cutting head into the first borehole or the second borehole through the guide assembly;

[0018] S3. Start the jet cutting head to make a cross-shaped cut inside the borehole to form an anti-impact and pressure relief structure;

[0019] S4. After completing the cross-shaped slit treatment, remove the jet rod and jet cutting head, and insert the grouting rod into the guide assembly;

[0020] S5. Inject grout into the cut area using a grouting rod;

[0021] S6. Install an elastic coupling component at the end of the guide assembly away from the grouting rod, and connect the two elastic coupling components through a connecting bracket.

[0022] The cross-shaped slit treatment forms a cutting slit that includes a first cutting slit extending along the width direction of the roadway and a second cutting slit extending along the length direction of the roadway. Adjacent first cutting slits are continuously distributed along the width direction and interconnected with each other on the top or bottom plate of the roadway; adjacent second cutting slits are continuously distributed along the length direction and interconnected with each other on the top or bottom plate of the roadway.

[0023] Compared with the prior art, the present invention provides a device and method for preventing rockburst under complex conditions of great burial depth, which has the following beneficial effects:

[0024] This invention proposes a device and method for preventing rockbursts under complex conditions at great depths. By expanding the pressure relief range through cross-shaped mesh slits and combining it with elastic coupling components to actively coordinate the deformation of the roof and floor, it achieves a breakthrough from "local pressure relief" to "regional pressure relief" and from "passive bearing" to "active coordination," providing an innovative solution for preventing rockbursts in deep mines.

[0025] The design employs a cross-shaped slit pattern, where the first slit a, extending along the width of the tunnel, and the second slit b, extending along the length, are continuously distributed and interconnected on the roof / floor, forming a mesh-like stress relief structure. This structure expands the stress relief range from localized to regional, significantly increasing the stress release area, more thoroughly disrupting the original rock stress concentration zone, effectively reducing the energy threshold for triggering rockbursts, and achieving a better stress relief effect.

[0026] Furthermore, addressing the challenges of multi-directional stress superposition and asymmetric deformation in deep, complex geological conditions, this invention utilizes elastic coupling components and a connecting frame to achieve bidirectional transmission and coordination of deformation between the top and bottom strata. For example, when the deep parts of the top strata shift, the elastic coupling components transfer some of the expansion energy to the bottom strata and its deeper parts, releasing stress in both the top and bottom strata. This "bidirectional coupling" mechanism actively guides the coordination of strata deformation, achieving a shift from "passive bearing" to "active pressure relief." Attached Figure Description

[0027] Figure 1 A schematic diagram of the planar structure of a rockburst prevention device under complex conditions of great burial depth. Figure 1 ;

[0028] Figure 2 for Figure 1 A schematic diagram of the planar structure of the jet cutting head in this invention;

[0029] Figure 3 This is a schematic diagram showing the distribution of the first and second cutting seams in this invention. Figure 1 ;

[0030] Figure 4 This is a schematic diagram showing the distribution of the first and second cutting seams in this invention. Figure 2 ;

[0031] Figure 5 A schematic diagram of the planar structure of a rockburst prevention device under complex conditions of great burial depth. Figure 2 ;

[0032] Figure 6 This is a schematic diagram of the planar structure of the elastic coupling component in this invention;

[0033] Figure 7 A flowchart of a method for preventing rockburst under complex conditions with great burial depth;

[0034] In the diagram: a) First cutting slit; b) Second cutting slit; 1) First borehole; 2) Second borehole; 3) Guide assembly; 31) Attachment frame; 32) Sealing sleeve; 4) Jet rod; 5) Jet cutting head; 51) Inlet rod; 52) Outlet seat; 53) Positioning seat; 54) Reset component; 55) Locking seat; 56) Roller; 57) Spherical chamber; 58) Jet head; 59) Inlet; 510) Limiting block; 511) Locking bladder; 512) Sealing gasket; 6) Elastic coupling assembly; 61) Support rod; 62) Support seat; 63) Mounting seat; 64) Elastic component; 65) Coupling rod; 66) Spring; 7) Connecting frame; 8) Grouting rod. Detailed Implementation

[0035] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms are interchangeable where appropriate; this is merely a way of distinguishing objects with the same attributes in the embodiments of this application. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, so that a process, method, system, product, or apparatus that comprises a series of elements is not necessarily limited to those elements, but may include other elements not explicitly listed or inherent to those processes, methods, products, or apparatuses.

[0036] Example: Please refer to Figures 1-7 , Figure 1 A schematic diagram of the planar structure of a rockburst prevention device under complex conditions of great burial depth. Figure 1 This is a schematic diagram of the cross-shaped slit treatment stage; Figure 5 A schematic diagram of the planar structure of a rockburst prevention device under complex conditions of great burial depth. Figure 2 This is a schematic diagram of the support stage; Figure 3 Schematic diagram of the distribution of the first and second cutting seams Figure 1 It only shows the distribution of the first and second cutting seams on the top or bottom slab of one side of the tunnel; Figure 4 Schematic diagram of the distribution of the first and second cutting seams Figure 2 It shows the distribution of the first and second cutting seams on the roof or floor of the tunnel.

[0037] In this embodiment of the invention, a device for preventing rockburst under complex conditions at great burial depth is provided, comprising: multiple sets of first boreholes 1 spaced apart along the length of the roadway and opened on the roof of the roadway, each set including two symmetrically arranged first boreholes 1; multiple sets of second boreholes 2 spaced apart along the length of the roadway and opened on the floor of the roadway, each set including two symmetrically arranged second boreholes 2; a guide assembly 3 corresponding to the opening of the first borehole 1 or the opening of the second borehole 2; a jet rod 4 can be fed into the first borehole 1 or the second borehole 2 through the guide assembly 3, the end of the jet rod 4 is connected to a jet cutting head 5, the jet cutting head 5 can perform cross-shaped slit treatment; the guide assembly 3 includes an attachment frame 31 for attaching to the roof or the floor of the roadway, and a sealing sleeve 32 is provided through the attachment frame 31.

[0038] Therefore, the implementation includes the following steps: Step 1: Multiple sets of first boreholes 1 and second boreholes 2 are opened at intervals along the length of the roadway in the roof and floor slabs, respectively; Step 2: The guide assembly 3 is installed at the openings of the first borehole 1 and the second borehole 2, and the jet rod 4 and jet cutting head 5 are fed into the first borehole 1 or the second borehole 2 through the guide assembly 3; Step 3: The jet cutting head 5 is activated to perform cross-shaped slit treatment in the borehole to form an anti-impact and pressure relief structure; Step 4: After the cross-shaped slit treatment is completed, the jet rod 4 and jet cutting head 5 are removed, and the grouting rod 8 is placed in the guide assembly 3; Step 5: Grout is injected into the slit area through the grouting rod 8, and then an elastic coupling assembly 6 is installed at the end of the guide assembly 3 away from the grouting rod 8, and the two elastic coupling assemblies 6 are connected by the connecting frame 7.

[0039] Multiple sets of symmetrical first boreholes 1 and second boreholes 2 are spaced along the length of the tunnel roof and floor, with each set containing two symmetrical boreholes (first borehole 1 and second borehole 2). This symmetrical distribution creates corresponding pressure relief zones, enhancing the overall pressure relief effect. The attachment frame 31 of the guide assembly 3 is attached to the tunnel roof or floor, and a sealing sleeve 32 penetrates the attachment frame 31 to guide the jet rod 4 into the borehole. Therefore, the function of the sealing sleeve 32 is to fix the insertion direction of the jet rod 4, ensuring that the jet cutting head 5 accurately reaches the target position and improving operational stability.

[0040] In addition, after the jet rod 4 sends the jet cutting head 5 into the borehole, the jet cutting head 5 is activated to make a cross-shaped cut, forming a mesh-like pressure relief structure, which effectively releases local stress concentration. Compared with a cut in a single direction, the mesh-like structure formed by the cross-shaped cut can expand the pressure relief range and effectively reduce the risk of rockburst.

[0041] The jet cutting head 5 includes: an inlet rod 51, one end of which is connected to the jet rod 4, and the other end is connected to an outlet seat 52, the end of the outlet seat 52 away from the inlet rod 51 being hemispherical; and a spherical chamber 57, which is fitted onto the hemispherical surface of the outlet seat 52, the end of the spherical chamber 57 near the outlet seat 52 having an inlet 59, and the other end extending outward and integrally forming a jet head 58. The core of the jet cutting head 5 is to adjust the jet direction by rotating the spherical chamber 57, and to fix the cutting angle by combining the locking mechanism of the locking seat 55, ultimately achieving cross-shaped kerf treatment.

[0042] The specific working principle is as follows: The high-pressure jet fluid enters the inlet rod 51 through the jet rod 4, and then flows into the outlet seat 52. The distal end of the outlet seat 52 is hemispherical, which matches the hemispherical surface of the spherical chamber 57 to form a liquid channel. The liquid enters from the inlet 59 of the spherical chamber 57 and is finally ejected at high speed from the jet head 58, forming a high-pressure water jet for cutting the rock mass. By adjusting the angle of the spherical chamber 57, the spray direction of the jet head 58 can be changed.

[0043] In addition, a locking seat 55 is slidably disposed on the outside of the liquid outlet seat 52. The top of the locking seat 55 has an opening to avoid the jet head 58. Four rollers 56 arranged in a circular array are rotatably disposed in the locking seat 55. A limiting block 510 is fixed on the outer surface of the liquid outlet seat 52. The limiting block 510 is slidably connected to the locking seat 55. A locking bladder 511 is disposed between the bottom of the limiting block 510 and the locking seat 55. When the locking bladder 511 is inflated, it can drive the locking seat 55 to move downward.

[0044] In the initial state, the locking bladder 511 is not inflated, and the locking seat 55 is in a high position (with relatively loose contact with the spherical chamber 57). At this time, the spherical chamber 57 can be freely rotated to adjust the jet direction.

[0045] When a fixed cutting angle is required, the locking bladder 511 is inflated. The expansion of the locking bladder 511 pushes the locking seat 55 downward, causing both the locking seat 55 and the roller 56 to press firmly against the surface of the spherical chamber 57. The rolling characteristics of the roller 56 reduce friction, and the clamping force fixes the position of the spherical chamber 57, ensuring a stable jet direction during the cutting process.

[0046] The spherical chamber 57 fits tightly with the hemispherical surface of the liquid outlet seat 52, and the locking action of the locking seat 55 can effectively prevent high-pressure jet liquid from leaking from the mating surface.

[0047] Furthermore, a positioning seat 53 is fixedly sleeved on the outside of the inlet rod 51. The positioning seat 53 is slidably connected to the locking seat 55, and a reset member 54 is connected between the positioning seat 53 and the locking seat 55. When the locking bladder 511 is inflated and pushes the locking seat 55 downward (pressing the spherical chamber 57), the reset member 54 is compressed, storing elastic potential energy. When it is necessary to adjust the jet direction, the locking bladder 511 is deflated, the reset member 54 releases its elastic potential energy, and drives the locking seat 55 to slide upward back to its initial position, releasing the pressure on the spherical chamber 57. At this time, the spherical chamber 57 can be freely rotated to adjust the jet direction.

[0048] The upper surface of the liquid outlet seat 52 is also fixed with two concentrically arranged sealing gaskets 512. The inner sealing gasket 512 is located at the mating surface between the hemispherical surface of the liquid outlet seat 52 and the spherical chamber 57, sealing the internal liquid channel and preventing high-pressure liquid from leaking from the gap between the spherical chamber 57 and the liquid outlet seat 52. The outer sealing gasket 512 is located at the mating surface between the hemispherical surface of the liquid outlet seat 52 and the spherical chamber 57, and is located outside the inner sealing gasket 512, further sealing the external gap and preventing external liquid from entering the spherical chamber 57.

[0049] During implementation, after the cross-shaped slit treatment is completed, the jet rod 4 and jet cutting head 5 are removed and the grouting rod 8 is inserted. At this time, the guide component 3 is provided with an elastic coupling component 6 at the end away from the grouting rod 8, and the two corresponding elastic coupling components 6 are connected by a connecting frame 7.

[0050] In other words, after making the cross-shaped cut, grout is injected into the borehole through the grouting rod 8, thereby anchoring the grouting rod 8 in the rock strata. It should be noted that the injected grout is only used to fix the grouting rod 8, making it an "anchor point" to provide a stable force transmission basis for the elastic coupling component 6.

[0051] The elastic coupling component 6 achieves coupling and pressure relief between the top plate and the bottom plate through the connecting frame 7. Specifically, the elastic coupling component 6 includes: a support rod 61, one end of which is connected to the connecting frame 7 and the other end is connected to a support base 62; a mounting base 63, which is fixed on the support base 62 and has a through hole in the middle; an elastic element 64, which is disposed in the through hole; and a coupling rod 65, one end of which contacts the elastic element 64 and the other end extends into the sealing sleeve 32 and is threadedly connected to the grouting rod 8.

[0052] In addition, a spring 66 is sleeved on the outside of the coupling rod 65, and the spring 66 is located between the sealing sleeve 32 and the mounting base 63.

[0053] Therefore, when the deep rock strata of the roof expand due to ground pressure, the grouting layer transmits the deformation to the coupling rod 65, driving the coupling rod 65 to move towards the elastic element 64. The elastic element 64 absorbs part of the deformation energy and simultaneously transmits the deformation force to the corresponding elastic coupling component 6 of the bottom plate through the connecting frame 7. The coupling rod 65 of the elastic coupling component 6 of the bottom plate further transmits the deformation force to the deep part of the bottom plate, driving the bottom plate rock strata to undergo reverse deformation and releasing the stress in the deep part of the bottom plate. Similarly, the deformation of the deep rock strata of the bottom plate will also be transmitted to the roof plate through the elastic coupling component 6, forming a "two-way coupling" of deformation between the roof plate and the bottom plate rock strata.

[0054] Additionally, it should be noted that the spring 66 is sleeved outside the coupling rod 65, located between the sealing sleeve 32 and the mounting base 63. When the deep rock strata of the roof expand due to ground pressure, the grouting rod 8 transmits the deformation force to the coupling rod 65, driving the coupling rod 65 to move towards the elastic element 64. The elastic element 64 and the spring 66 absorb the deformation energy, and simultaneously transmit the deformation force to the corresponding elastic coupling assembly 6 of the bottom plate through the connecting frame 7. The coupling rod 65 of the elastic coupling assembly 6 of the bottom plate further transmits the deformation force to the bottom plate grouting rod 8 and the bottom plate, realizing the support of the roof plate by the bottom plate and the pressure relief of the deep rock strata of the bottom plate. Similarly, the deformation of the deep rock strata of the bottom plate will also affect the roof plate and the deep rock strata of the roof plate.

[0055] Please refer to Figure 7 In this embodiment, a method for preventing rockbursts under complex conditions with great burial depth is also provided, which includes the following steps:

[0056] S1. Multiple sets of first boreholes 1 and second boreholes 2 are respectively opened in the roof and floor of the roadway, distributed at intervals along the length of the roadway;

[0057] S2. The guide assembly 3 is installed at the opening of the first borehole 1 and the second borehole 2 respectively, and the jet rod 4 and the jet cutting head 5 are fed into the first borehole 1 or the second borehole 2 through the guide assembly 3.

[0058] S3. Start the jet cutting head 5 to make a cross-shaped cut in the borehole to form an anti-impact and pressure relief structure;

[0059] S4. After completing the cross-shaped slit treatment, remove the jet rod 4 and the jet cutting head 5, and insert the grouting rod 8 into the guide assembly 3;

[0060] S5. Inject grout into the cut area through grouting rod 8;

[0061] S6. Install the elastic coupling component 6 at the end of the guide component 3 away from the grouting rod 8, and connect the two elastic coupling components 6 through the connecting frame 7.

[0062] The cross-shaped slit treatment forms a cutting slit that includes a first cutting slit a extending along the width direction of the roadway and a second cutting slit b extending along the length direction of the roadway. Adjacent first cutting slits a are continuously distributed along the width direction and interconnected with each other on the top or bottom plate of the roadway. Adjacent second cutting slits b are continuously distributed along the length direction and interconnected with each other on the top or bottom plate of the roadway.

[0063] In other words, the continuity and interconnectivity of the cross-shaped slits (continuously distributed along the width and length directions) expands the stress relief range from local to regional, significantly improving the stress release effect. Compared to traditional single-slit or discontinuous slits, the mesh structure can more thoroughly disrupt stress concentration zones and reduce the rockburst trigger threshold.

[0064] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for preventing rockburst under complex conditions at great burial depth, characterized in that, include: Multiple sets of first boreholes (1) are distributed at intervals along the length of the roadway and opened on the roof of the roadway, each set containing two first boreholes (1) arranged symmetrically. Multiple sets of second boreholes (2) are distributed at intervals along the length of the roadway and opened on the bottom plate of the roadway, each set containing two symmetrically arranged second boreholes (2). The guide assembly (3) is installed in the opening of the first borehole (1) or the opening of the second borehole (2); The guide assembly (3) can feed a jet rod (4) into the first borehole (1) or the second borehole (2). The end of the jet rod (4) is connected to a jet cutting head (5), which can perform cross-shaped slit treatment. The guide assembly (3) includes an attachment frame (31) for attaching to the top or bottom plate of the tunnel, and a sealing sleeve (32) is provided through the attachment frame (31). After the cross-shaped cut is completed, the jet rod (4) and jet cutting head (5) are removed and the grouting rod (8) is inserted. At this time, the guide component (3) is provided with an elastic coupling component (6) at the end away from the grouting rod (8), and the two corresponding elastic coupling components (6) are connected by a connecting frame (7). The elastic coupling component (6) includes: The support rod (61) is connected at one end to the connecting frame (7) and at the other end to the support base (62). Mounting base (63), which is fixed on support base (62), and the mounting base (63) has a through hole in the middle; An elastic element (64) is disposed within the through hole; The coupling rod (65) has one end in contact with the elastic element (64) and the other end extends into the sealing sleeve (32) and is threadedly connected to the grouting rod (8).

2. The device for preventing rockburst under complex conditions at great burial depth according to claim 1, characterized in that, The jet cutting head (5) includes: The liquid inlet rod (51) has one end connected to the jet rod (4) and the other end connected to the liquid outlet seat (52). The end of the liquid outlet seat (52) away from the liquid inlet rod (51) is hemispherical. A spherical chamber (57) is fitted onto the hemispherical surface of the liquid outlet seat (52). One end of the spherical chamber (57) near the liquid outlet seat (52) is provided with a liquid inlet (59), and the other end extends outward and is integrally formed with a jet head (58).

3. The device for preventing rockbursts under complex conditions at great burial depth according to claim 2, characterized in that, A locking seat (55) is slidably provided on the outside of the liquid outlet seat (52), and the top of the locking seat (55) has an opening to avoid the jet head (58); The locking seat (55) is rotatably provided with four rollers (56) arranged in a circular array. The outer surface of the liquid outlet seat (52) is fixed with a limiting block (510), the limiting block (510) is slidably connected to the locking seat (55), and a locking bladder (511) is provided between the bottom of the limiting block (510) and the locking seat (55). When the locking bladder (511) is inflated, it can drive the locking seat (55) to move downward.

4. The device for preventing rockbursts under complex conditions at great burial depth according to claim 3, characterized in that, The liquid inlet rod (51) is fixedly fitted with a positioning seat (53), and the positioning seat (53) is slidably connected to the locking seat (55). A reset member (54) is connected between the positioning seat (53) and the locking seat (55).

5. The device for preventing rockbursts under complex conditions at great burial depth according to claim 3, characterized in that, The upper surface of the liquid outlet seat (52) is also fixed with two concentrically arranged sealing gaskets (512).

6. The device for preventing rockbursts under complex conditions at great burial depth according to claim 1, characterized in that, A spring (66) is sleeved on the outside of the coupling rod (65), and the spring (66) is located between the sealing sleeve (32) and the mounting base (63).

7. A method for preventing rockburst under complex conditions with great burial depth, characterized in that, It employs a rockburst prevention device under complex conditions with great burial depth as described in any one of claims 1-6, which includes the following steps: S1. Multiple sets of first boreholes (1) and second boreholes (2) are opened at intervals along the length of the roadway on the top and bottom plates respectively. S2. Install the guide assembly (3) at the opening of the first borehole (1) and the second borehole (2) respectively, and send the jet rod (4) and the jet cutting head (5) into the first borehole (1) or the second borehole (2) through the guide assembly (3). S3. Start the jet cutting head (5) to make a cross-shaped cut in the borehole to form an anti-impact and pressure relief structure; S4. After completing the cross-shaped slit treatment, remove the jet rod (4) and jet cutting head (5), and insert the grouting rod (8) into the guide assembly (3). S5. Inject grout into the cut area through the grouting rod (8); S6. Install an elastic coupling component (6) at the end of the guide component (3) away from the grouting rod (8), and connect the two elastic coupling components (6) through the connecting frame (7).

8. A method for preventing rockburst under complex conditions with great burial depth according to claim 7, characterized in that, The cross-shaped slit treatment forms a cutting slit including a first cutting slit (a) extending along the width direction of the roadway and a second cutting slit (b) extending along the length direction of the roadway. Adjacent first cutting slits (a) are continuously distributed along the width direction and interconnected with each other on the top or bottom plate of the roadway; adjacent second cutting slits (b) are continuously distributed along the length direction and interconnected with each other on the top or bottom plate of the roadway.

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