Gob-side entry retaining gangue retaining supporting structure

Abstract

The invention relates to the technical field of coal mines, and provides a gob-side entry retaining waste rock blocking supporting structure which comprises a waste rock blocking net, the waste rock blocking net comprises a first flexible net, a second flexible net and a plastic steel net, and the first flexible net, the second flexible net and the plastic steel net are arranged in a stacked mode. The gob-side entry retaining waste rock blocking supporting structure is used for overcoming the defects of metal net supporting in the prior art, optimization and recombination of a stress transmission path are achieved through gradient distribution of rigid and flexible materials, fine waste rock particles are further accurately screened and intercepted by a plastic steel net after being preliminarily intercepted by a flexible net, the leakage rate of fine waste rock can be effectively reduced, and the service life of the fine waste rock particles is prolonged. The flexible net and the plastic steel net have good corrosion resistance and oxidation resistance, and the problem that a traditional metal net is prone to rusting and embrittlement can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal mines, in particular to a gob-side entry retaining and gangue retaining support structure. Background Art

[0002] As the core method of pillarless mining, the reliability of the goaf retaining technology and its rock retaining support system is directly related to the stability of the roadway surrounding rock and the sealing effect of the goaf. Currently, the industry generally adopts the support method of laying metal mesh in front of the frame in combination with rock retaining brackets. Under conventional geological conditions, a relatively mature rock retaining system has been formed. However, under special geological conditions such as the three soft coal seams, the fine-grained sand and gravel produced by the crushing of the soft rock roof can easily pass through the traditional metal mesh under the action of mining stress, resulting in continuous rock leakage in the triangular area in front of the frame. This phenomenon will cause the roof of the area to be poured to bleed, making it impossible for the flexible formwork wall to achieve active roof connection. Summary of the Invention

[0003] The present invention provides a gangue retaining support structure along the goaf, which is used to solve the defects of the metal mesh support in the existing technology. The gradient distribution of rigid and flexible materials is used to achieve the optimized reorganization of the stress transfer path, so that fine gangue particles are initially intercepted by the flexible mesh and then further accurately screened and intercepted by the plastic-steel mesh, which can effectively reduce the fine gangue leakage rate. In addition, the flexible mesh and the plastic-steel mesh have good corrosion resistance and oxidation resistance, which can avoid the rust and embrittlement problems that are prone to occur in traditional metal meshes.

[0004] The gob-side tunnel retaining rock retaining support structure provided by the present invention comprises a rock retaining net, which comprises a first flexible net, a second flexible net and a plastic-steel net, and the first flexible net, the second flexible net and the plastic-steel net are stacked.

[0005] According to the gob-side tunnel retaining and gangue support structure provided by the present invention, the plastic-steel net is arranged between the first flexible net and the second flexible net.

[0006] According to the gob-side entry retaining gangue support structure provided by the present invention, the first flexible net comprises a polyester fiber flexible net.

[0007] According to the gob-side entry retaining rock retaining support structure provided by the present invention, the second flexible net comprises a polyester fiber flexible net.

[0008] The goaf-side tunnel retaining and slag retaining support structure provided by the present invention also includes a threaded steel anchor rod, which is passed through the first flexible net, the second flexible net and the plastic steel net. The threaded steel anchor rod is used to be fixed to the surface to be supported so as to limit the movement of the first flexible net, the second flexible net and the plastic steel net relative to the surface to be supported.

[0009] According to the gob-side tunnel retaining and gangue retaining support structure provided by the present invention, the second flexible net is arranged between the first flexible net and the plastic-steel net, and the plastic-steel net is used to be arranged toward the surface to be supported.

[0010] The gob-side tunnel retaining rock retaining support structure provided by the present invention further includes a first winch, one end of the rock retaining net is wound around the first winch, and the first winch is used to retract and extend the rock retaining net.

[0011] The gob-side tunnel retaining rock retaining support structure provided by the present invention further includes a second winch, the other end of the rock retaining net is wound around the second winch, and the second winch is used to retract and extend the rock retaining net.

[0012] According to the gob-side entry retaining and gangue retaining support structure provided by the present invention, the meshes of any two of the first flexible net, the second flexible net and the plastic-steel net are stacked and staggered.

[0013] According to the gob-side entry retaining support structure provided by the present invention, the longitudinal tensile strength of the first flexible net and the second flexible net are both greater than or equal to 400 kN / m; Furthermore, the weft tensile strength of the first flexible net and the second flexible net are both greater than or equal to 400 kN / m.

[0014] In the goaf-side tunnel retaining support structure provided by the present invention, a composite mechanism of flexible load-bearing and rigid barrier is formed at the structural level by stacking and combining a first flexible net, a second flexible net, and a plastic-steel net: the double-layer flexible net can effectively absorb the shear stress generated by the roof collapse and expansion through its ductility and deformation capacity, reducing the risk of local tearing of the net surface, while the plastic-steel net, with its high tensile strength and controllable mesh size, can form a physical barrier to the fine-grained sand and gravel generated by the soft rock roof. In addition, when the broken rock mass of the roof slips under mining stress, the interlayer dislocation of the flexible net can eliminate some of the lateral stress, while the rigid skeleton of the plastic-steel net can maintain the continuity of the overall structure, thereby avoiding mesh penetration failure caused by stress concentration in a single material.

[0015] Compared with the existing slag retaining system that simply relies on metal mesh, the slag retaining support structure for goaf-retaining tunnels provided by the present invention realizes the optimized reorganization of the stress transfer path through the gradient distribution of rigid and flexible materials, so that fine slag particles are further accurately screened and intercepted by the plastic steel mesh after being initially intercepted by the flexible mesh, which can effectively reduce the leakage rate of fine slag. At the same time, the collaborative deformation characteristics of the three-layer mesh structure can adapt to the dynamic changes of the uneven settlement of the roof of the three-soft coal seam. While maintaining the integrity of the slag retaining surface, it can avoid the secondary roof pumping problem caused by the incoordination between the rigid metal mesh and the surrounding rock deformation, and create a stable roof support environment for the active connection of the flexible mold wall. In addition, the flexible mesh and the plastic steel mesh have good corrosion resistance and oxidation resistance. In humid environments such as the three-soft water-rich coal seams, their material properties can effectively resist the erosion of water vapor and acidic media, and can avoid the rust and embrittlement problems that are prone to occur in traditional metal meshes, thereby maintaining the mechanical stability of the mesh structure during long-term service. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 It is a structural schematic diagram of the gob-side tunnel retaining slag retaining net provided by an embodiment of the present invention.

[0018] Figure 2 It is a structural diagram of the first flexible net provided by an embodiment of the present invention.

[0019] Figure 3 It is a structural schematic diagram of the plastic-steel mesh provided by an embodiment of the present invention.

[0020] Reference numerals: 100: Gangue retaining net; 110: First flexible net; 120: Second flexible net; 130: Plastic steel net. DETAILED DESCRIPTION

[0021] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0022] In the description of the embodiments of this application, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on the specific circumstances.

[0023] In the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "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," and "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.

[0024] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0025] Figure 1 Schematic diagram of the structure of the gob-side entry retaining slag retaining net provided by an embodiment of the present invention; Figure 2 is a schematic structural diagram of a first flexible net provided in an embodiment of the present invention; Figure 3 It is a structural schematic diagram of the plastic-steel mesh provided by an embodiment of the present invention.

[0026] See Figure 1 、 Figure 2 and Figure 3An embodiment of the present invention provides a gob-side entry retaining and slag retaining support structure. The gob-side entry retaining and slag retaining support structure includes a slag retaining net 100. The slag retaining net 100 comprises a first flexible net 110, a second flexible net 120, and a plastic-steel net 130. The first flexible net 110, the second flexible net 120, and the plastic-steel net 130 are stacked. During use, the slag retaining net 100 can be laid above the top beam of a support along the construction direction and supported by corresponding barrier rod supports.

[0027] It should be noted that "stacked arrangement" means that any one of the first flexible net 110, the second flexible net 120, and the plastic steel net 130 is used as the foundation, and the other two are laid layer by layer on the foundation layer. The length and width dimensions of the three-layer net structure are consistent, and the specific dimensions can be adaptively selected and set according to actual conditions. It should also be noted that the "construction direction" here refers to the construction direction of the bar support, which can be adaptively set according to actual conditions.

[0028] It is understandable that in the goaf-side tunnel retaining support structure provided by the embodiment of the present invention, by stacking and combining the first flexible net 110, the second flexible net 120 and the plastic-steel net 130, a composite mechanism of flexible bearing and rigid barrier is formed at the structural level: the double-layer flexible net can effectively absorb the shear stress generated by the roof expansion through its ductility and deformation capacity, reducing the risk of local tearing of the net surface, while the plastic-steel net 130, with its high tensile strength and controllable mesh size, can form a physical barrier to the fine-grained sand and gravel generated by the soft rock roof. In addition, when the broken rock mass of the roof slips under mining stress, the interlayer dislocation of the flexible net can eliminate part of the lateral stress, while the rigid skeleton of the plastic-steel net 130 can maintain the continuity of the overall structure, thereby avoiding the mesh surface penetration failure caused by stress concentration of a single material.

[0029] Compared with the existing slag retaining system that relies solely on metal mesh, the slag retaining support structure for goaf-retaining tunnels provided by the embodiment of the present invention achieves optimized reorganization of the stress transfer path through the gradient distribution of rigid and flexible materials, so that fine slag particles are further accurately screened and intercepted by the plastic-steel mesh 130 after being initially intercepted by the flexible mesh, which can effectively reduce the fine slag leakage rate. At the same time, the collaborative deformation characteristics of the three-layer mesh structure can adapt to the dynamic changes of the uneven settlement of the roof of the three-soft coal seam. While maintaining the integrity of the slag retaining surface, it can avoid the secondary roof pumping problem caused by the incoordination between the rigid metal mesh and the surrounding rock deformation, and create a stable roof support environment for the active connection of the flexible mold wall. In addition, the flexible mesh and the plastic-steel mesh 130 have good corrosion resistance and oxidation resistance. In humid environments such as the three-soft water-rich coal seams, their material properties can effectively resist the erosion of water vapor and acidic media, and can avoid the rust and embrittlement problems that are prone to occur in traditional metal meshes, thereby maintaining the mechanical stability of the mesh structure during long-term service.

[0030] Continue reading Figure 1 and Figure 2 In an optional embodiment of the present invention, the plastic-steel mesh 130 is arranged between the first flexible mesh 110 and the second flexible mesh 120; it can be understood that in the goaf-side tunnel retaining support structure provided by the embodiment of the present invention, by sandwiching the plastic-steel mesh 130 between the first flexible mesh 110 and the second flexible mesh 120, this layout first constructs a "flexible-rigid-flexible" symmetrical stress buffer system at the spatial level: when the roof rock is pressed down, the outer flexible mesh can absorb the initial impact load through its own ductility and evenly distribute it to the middle plastic-steel mesh 130, avoiding the rigid mesh surface from directly bearing local concentrated stress; and the plastic-steel mesh 130, as an intermediate rigid interlayer, can rely on the wrapping constraint of the outer flexible mesh to improve its bending resistance during lateral shear deformation, and can also rely on the stability of its own grid shape to block the penetration path of fine-grained sand and gravel.

[0031] At the same time, the bidirectional wrapping effect of the internal and external flexible nets keeps the plastic-steel mesh 130 in a controlled stress field during the dynamic deformation of the roof. This not only suppresses the warping instability of the rigid mesh surface caused by insufficient boundary constraints, but also weakens the shear damage to the plastic-steel mesh 130 structure caused by interlayer displacement through the friction damping effect of the flexible interface. Compared with the asymmetric stacking method, this symmetrical structure, through the balanced design of the mechanical transmission path, can form a complementary reinforcement effect between rigid barrier and flexible deformation in three-dimensional space. This not only avoids the sudden stress change of the roof contact surface caused by the external placement of a single rigid layer, but also prevents the problem of insufficient overall shear stiffness of the structure caused by excessive stacking of flexible nets. This improves the efficiency of retaining gangue while enhancing the composite mesh's ability to adapt to the uncoordinated deformation of the three-soft coal seam roof.

[0032] In an optional embodiment of the present invention, the first flexible net 110 includes a polyester fiber flexible net. It can be understood that by using polyester fiber material to form the first flexible net 110, when the broken rock of the roof contacts the slag retaining net 100, the polyester fiber flexible net can quickly respond to the dynamic pressure of the roof with its high elastic modulus, absorb the impact energy through the elastic deformation between the fiber filaments and evenly disperse it to the adjacent structural layers, thereby avoiding stress concentration on a single node.

[0033] At the same time, polyester fiber's inherent resistance to hydrolysis and acid and alkali allows it to maintain the integrity of its mesh structure over long periods of time in water-rich, humid coal seam environments. Compared to traditional metal meshes, which experience mesh expansion or strength loss due to rust, this material fundamentally reduces the risk of performance degradation of the contact layer caused by environmental erosion. Furthermore, the gradient matching of the mechanical properties of the polyester fiber mesh and the plastic-steel mesh 130 creates a continuous load transfer path between the flexible deformation of the outer layer and the rigid support of the inner layer. The polyester fiber mesh's ductility mitigates the direct impact of uneven roof deformation on the rigid layer, while its low friction coefficient reduces shear resistance at the contact surface with the surrounding rock, thereby minimizing wear and damage to the composite mesh during the sliding of roof debris.

[0034] In an optional embodiment of the present invention, the second flexible net 120 includes a polyester fiber flexible net. It can be understood that by using polyester fiber material to form the second flexible net 120, when the broken rock of the roof contacts the slag retaining net 100, the polyester fiber flexible net can quickly respond to the dynamic pressure of the roof with its high elastic modulus, absorb the impact energy through the elastic deformation between the fiber filaments and evenly disperse it to the adjacent structural layers, thereby avoiding stress concentration on a single node.

[0035] At the same time, polyester fiber's inherent resistance to hydrolysis and acid and alkali allows it to maintain the integrity of its mesh structure over long periods of time in water-rich, humid coal seam environments. Compared to traditional metal meshes, which experience mesh expansion or strength loss due to rust, this material fundamentally reduces the risk of performance degradation of the contact layer caused by environmental erosion. Furthermore, the gradient matching of the mechanical properties of the polyester fiber mesh and the plastic-steel mesh 130 creates a continuous load transfer path between the flexible deformation of the outer layer and the rigid support of the inner layer. The polyester fiber mesh's ductility mitigates the direct impact of uneven roof deformation on the rigid layer, while its low friction coefficient reduces shear resistance at the contact surface with the surrounding rock, thereby minimizing wear and damage to the composite mesh during the sliding of roof debris.

[0036] An optional embodiment of the present invention also includes threaded steel anchor rods. When in use, the threaded steel anchor rods can be passed through the rock retaining net 100 at the initial end of the rock retaining net 100 and then fixed to the surface to be supported. It should be noted that the specific setting position and number of the threaded steel anchor rods can be adaptively set according to actual conditions. It should also be noted that the "surface to be supported" here refers to the wall surface that needs to be supported by the rock retaining net 100 and the retaining rod bracket during the construction process, such as the tunnel roof and the side of the goaf.

[0037] It can be understood that by installing threaded steel anchor rods at the initial end of the rock retaining net 100 and anchoring it to the surface to be supported, when the support is pulled to generate lateral traction, the threaded steel anchor rods, through their high tensile strength, rigidly connect the rock retaining net 100 to the roof rock stratum, effectively suppressing the mesh's tendency to slide along the roof. Compared to traditional rock retaining systems without anchors, this design maintains the spatial positioning accuracy of the rock retaining net 100 during the support movement through the synergistic effect of the anchor rods and the flexible net, improving the continuity and stability of the rock retaining support surface during the flexible formwork wall connection operation.

[0038] In an optional embodiment of the present invention, unlike the aforementioned embodiment without the surface to be supported, in this embodiment, the second flexible net 120 is disposed between the first flexible net 110 and the plastic-steel net 130, and the plastic-steel net 130 is configured to face the surface to be supported. It is understood that in the gob-side entry retaining and rock-blocking support structure provided by the embodiment of the present invention, by placing the plastic-steel net 130 inside the first flexible net 110 and the second flexible net 120 and directly facing the surface to be supported, when the broken rock mass of the roof contacts the rock-blocking net 100, the plastic-steel net 130, by virtue of its rigidity, first forms a primary barrier to intercept fine rock, and directly blocks the downward leakage path of fine-grained sand and gravel through precise mesh size, while the outer second flexible net 120 absorbs the impact kinetic energy of the broken rock mass of the roof through interlayer deformation, and evenly transfers the dispersed load to the rigid layer of the internal plastic-steel net 130, thereby avoiding local mesh deformation and failure of the rigid mesh surface caused by direct dynamic impact.

[0039] In an optional embodiment of the present invention, a first winch is further included, and one end of the slag retaining net 100 is wound around the first winch. The first winch is used to retract and release the slag retaining net 100. The specific structure of the first winch can refer to the existing technology, such as a hoisting device. It can be understood that when the roof undergoes uneven settlement or the support moves to cause the net surface to be pulled, the reeling function of the winch can compensate for the slack of the slag retaining net 100 in real time, and ensure that the layers of the composite structure fit tightly by maintaining the preset tension state of the net body, avoiding uneven stress distribution caused by local wrinkles on the net surface. At the same time, the net-releasing action of the winch is synchronized with the rhythm of mining advancement, so that the coverage of the slag retaining net 100 can be continuously expanded as the working face extends, reducing the seam dislocation or coverage blind spots caused by traditional manual net laying.

[0040] Compared with the fixed rock retaining net 100 installation mode, the adjustability of the winch drive not only enhances the composite net's ability to follow the dynamic deformation of the roof, but also optimizes the collaborative deformation mechanism of the flexible net and the plastic-steel net 130 through precise control of mechanical tension: when the roof pressure increases, moderate tightening of the winch can increase the overall bending stiffness of the net to resist the impact of broken rock; and when the roof sinks suddenly, the controlled release of the winch allows the net to absorb deformation energy through moderate extension, thereby establishing a dynamic balance between the dual functions of rigid barrier and flexible buffering.

[0041] In an optional embodiment of the present invention, a second winch is further included. The other end of the slag retaining net 100 is wound around the second winch. The second winch is used to retract and extend the slag retaining net 100. The specific structure of the second winch can refer to the existing technology, such as the winch device. It can be understood that by respectively configuring the first winch and the second winch at both ends of the slag retaining net 100 to form a bidirectional tension control system, when the top plate is asymmetrically deformed or the bracket is pushed in multiple directions, the coordinated retraction and extension action of the double winches can dynamically adjust the traction force distribution on both sides of the slag retaining net 100. By bidirectional tensioning, the distortion of the net surface or the dislocation between layers caused by unilateral force can be eliminated, thereby ensuring that the composite structure of the plastic steel net 130 and the flexible net remains tightly fitted over the entire width.

[0042] Compared with the single-winch unidirectional tensioning mode, the double-winch layout reconstructs the boundary constraint conditions of the rock retaining net 100 through bidirectional mechanical coupling, so that the composite net body can maintain the overall impact resistance stiffness through the synchronous tightening of the winches on both sides during the severe deformation of the roof, and can also achieve adaptive fitting of the net surface and the surrounding rock deformation with the help of asynchronous net release.

[0043] A specific installation example of the slag retaining net 100 of the present invention is shown below.

[0044] Based on the progress of the mining face, the maintenance team laid two layers of PET400×400MS high-strength polyester fiber flexible mesh (10m×10m) and one layer of 130 steel-plastic mesh along the strike path above the top beams of supports 1 through 7. To prevent the rock retaining mesh from slipping during support movement, a φ21.8×2200mm threaded steel anchor was driven perpendicular to the roof between supports 6 and 7. Manual winches were installed on the lower columns of supports 1 and 7 to support the remaining mesh below the support top beams. It is important to note that the flexible mesh was laid in front of the supports to block most of the large rock from the top of the roadway rock retaining area and the side of the goaf. The top beam behind the transition support is a single-piece beam, topped with a large leak-proof rock plate, overlapping the rock retaining support by approximately 1200mm to completely block the fine rock from the top. At the same time, the front top beam of the slag retaining bracket is equipped with a telescopic beam, which can serve as a temporary top protection after the transition frame is moved. The top beams of the transition bracket and the slag retaining bracket A (close to the wall side) are both equipped with double-side side protection devices.

[0045] In an optional embodiment of the present invention, the meshes of any two of the first flexible net 110, the second flexible net 120 and the plastic-steel net 130 are arranged in a staggered stacking arrangement; it can be understood that by staggering the meshes of the first flexible net 110, the second flexible net 120 and the plastic-steel net 130, when fine-grained sand and gravel pass through the outer flexible mesh, its falling path is forced to deflect in direction due to the offset of the mesh positions of the adjacent layers, thereby forming a collision energy dissipation effect at the interface between the layers, and the geometric shielding effect caused by the staggered inner mesh further reduces the effective penetration gap, forcing smaller particle size debris to remain in the composite net body.

[0046] Compared with the traditional laminated structure with aligned meshes, this staggered design not only improves the gradient screening ability of non-uniform particle size debris through the dual effects of spatial shielding and mechanical coupling, but also reduces the risk of tearing on a single mesh surface due to stress concentration through the decentralized transfer of interlayer loads.

[0047] In an optional embodiment of the present invention, the warp tensile strength of the first flexible net 110 and the second flexible net 120 is greater than or equal to 400 kN / m; and the weft tensile strength of the first flexible net 110 and the second flexible net 120 is greater than or equal to 400 kN / m.

[0048] It can be understood that by limiting the warp and weft tensile strength of the first flexible net 110 and the second flexible net 120 to no less than 400 kN / m, when the roof gangue load acts on the net body, the flexible net forms a continuous load-bearing skeleton through the balanced tensile strength in the warp and weft directions, maintaining the structural stability of the fiber nodes during the deformation of the mesh, and avoiding the warp or weft unidirectional tearing extension caused by local overload.

[0049] At the same time, the strong characteristics of warp and weft enable the flexible net to evenly disperse multi-directional stress when the roof deforms asymmetrically. Regardless of shear slip along the inclination of the coal seam or extrusion deformation along the strike, the concentrated stress can be converted into surface distributed load through the coordinated deformation of the tensile fibers, thereby forming a coherent force chain transmission with the rigid support of the internal plastic steel net 130.

[0050] Compared with the phenomenon of mesh yielding or node disconnection that is prone to occur in lower strength flexible meshes under dynamic loads, the establishment of this strength threshold not only ensures the structural integrity of the outer flexible mesh under severe deformation conditions of the roof, but also optimizes the functional distribution ratio of energy absorption of the flexible layer and barrier of the rigid layer in the composite structure through the stiffness gradient matching of the high-strength mesh surface and the plastic-steel mesh 130, thereby preventing fine gangue from penetrating while reserving controllable energy consumption space for large deformation of the roof.

[0051] It should be noted that the technical solutions in the various embodiments of the present invention can be combined with each other, but the basis for the mutual combination is that it can be implemented by ordinary technicians in this field; when the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist, that is, it does not fall within the scope of protection of the present invention.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A gob-side entry retaining slag support structure, characterized in that: The invention comprises a rock retaining net (100), wherein the rock retaining net (100) comprises a first flexible net (110), a second flexible net (120) and a plastic-steel net (130), wherein the first flexible net (110), the second flexible net (120) and the plastic-steel net (130) are stacked.

2. The gob-side entry retaining slag retaining support structure according to claim 1 is characterized in that: The plastic-steel net (130) is arranged between the first flexible net (110) and the second flexible net (120).

3. The gob-side entry retaining support structure according to claim 2 is characterized in that: The first flexible net (110) comprises a polyester fiber flexible net.

4. The gob-side entry retaining support structure according to claim 3 is characterized in that: The second flexible net (120) comprises a polyester fiber flexible net.

5. The gob-side entry retaining support structure according to claim 1 is characterized in that: It also includes a threaded steel anchor rod, the threaded steel anchor rod being passed through the first flexible net (110), the second flexible net (120) and the plastic steel net (130), the threaded steel anchor rod being used to be fixed to the surface to be supported, so as to be used to limit the movement of the first flexible net (110), the second flexible net (120) and the plastic steel net (130) relative to the surface to be supported.

6. The gob-side entry retaining slag retaining support structure according to claim 1, characterized in that: The second flexible net (120) is provided between the first flexible net (110) and the plastic-steel net (130), and the plastic-steel net (130) is used to be arranged toward the surface to be supported.

7. The gob-side entry retaining support structure according to any one of claims 1 to 6, characterized in that: It also includes a first winch, one end of the rock retaining net (100) is wound around the first winch, and the first winch is used to retract and unfold the rock retaining net (100).

8. The gob-side entry retaining slag retaining support structure according to claim 7, characterized in that: It also includes a second winch, the other end of the rock retaining net (100) is wound around the second winch, and the second winch is used to retract and unfold the rock retaining net (100).

9. The gob-side entry retaining support structure according to any one of claims 1 to 6, characterized in that: The meshes of any two of the first flexible net (110), the second flexible net (120) and the plastic-steel net (130) are arranged in a staggered and stacked manner.

10. The gob-side entry retaining slag retaining support structure according to any one of claims 1 to 6, characterized in that: The warp tensile strength of the first flexible net (110) and the second flexible net (120) are both greater than or equal to 400 kN / m; Furthermore, the weft tensile strength of the first flexible net (110) and the second flexible net (120) are both greater than or equal to 400 kN / m.

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