Roof-cutting self-retaining roadway forming method for mining roadway of solid waste filling working face

Abstract

The invention relates to the technical field of coal mining, and discloses a solid waste filling working face mining roadway roof cutting self-retaining roadway forming method which comprises the following steps that a plurality of blocking nets are installed between a reserved roadway and a goaf, roof cutting supports are installed in the reserved roadway, the bottom ends of the roof cutting supports are arranged at the bottoms of the blocking nets, and the blocking nets are arranged at the bottom ends of the roof cutting supports; the top end of the top cutting support makes contact with the top end of the reserved roadway. The goaf is filled with a filling body, a rock stratum below the basic roof is cut off along the edge of the goaf, the cut-off rock stratum is stacked above the filling body, a roadside supporting body is formed, and the roof cutting support is dismantled. The roof-cutting self-retaining roadway is carried out on the mining roadway of the solid waste filling working face, maintenance of the retained roadway is facilitated, the process is simple, cost is low, roadway retaining stability is high, and economic benefits are remarkable.

Description

Technical Field

[0001] The invention relates to the technical field of coal mining, in particular to a method for forming a lane by cutting the top of a mining laneway with a solid waste filling working face. Background Art

[0002] The technology of non-coal pillar roadway protection is an effective means to improve the recovery rate of coal resources. The main non-coal pillar roadway protection technologies include goaf-side roadway excavation and goaf-side roadway retention. Among them, goaf-side roadway retention, as the main technical means of non-coal pillar mining, has the advantage of reducing the amount of roadway excavation and is widely used in mines at home and abroad. The core of goaf-side roadway retention is the construction of roadway support bodies. The more common methods of roadway support construction are: high-water material filling method, wall method, paste material filling method, solid waste aggregate filling method, etc. Especially in the filling mining working face, the construction of roadway support bodies has problems such as difficulty in connecting the filling body to the top, complex construction process, and high material cost. The solid waste filling mining technology with gangue as the main filling material has the widest application scale due to its advantages such as low cost and strong applicability. For the solid waste filling mining working face, the top cutting support can be used to cut off the roof so that the filling body and the collapsed roof can jointly construct the roadway support body. It is a simple and low-cost method for cutting the top of the mining roadway and retaining the roadway.

[0003] Therefore, there is an urgent need for a method for cutting the top of a mining tunnel with solid waste filling working face to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a method for cutting the top of a mining roadway with solid waste filling working face and forming a self-retained roadway, so as to solve the problems existing in the above-mentioned prior art.

[0005] To achieve the above object, the present invention provides the following solution: The present invention provides a method for cutting the top of a mining roadway and forming a roadway by self-retention in a solid waste filling working face, comprising the following steps:

[0006] Install several blocking nets between the reserved tunnel and the goaf;

[0007] Installing a top cut bracket in the reserved lane, wherein the bottom end of the top cut bracket is arranged on the bottom of the blocking net, and the top end of the top cut bracket contacts the top end of the reserved lane;

[0008] Fill the goaf with a filling body, cut off the rock layer below the basic top along the edge of the goaf, and pile up the cut rock layer above the filling body to form a roadside support body, and remove the top cutting support.

[0009] Preferably, it also includes the mining height H of the coal seam; the thickness of the roof rock layer below the basic top below the basic top is the thickness H2 of the rock layer that can be cut off by the top cutting bracket; the minimum filling height of the filling body is H3, and H3 is obtained based on the preset relationship between H1, H2 and H3.

[0010] Preferably,

[0011] The minimum filling height of the filling body is H3 = HK A H2+H4;

[0012] H4 is the connection height between the side support and the tunnel roof.

[0013] Preferably, the barrier net is a double-layer woven "inverted T-shaped" gabion net, and the two wings at the bottom of the barrier net are respectively placed in the goaf and the reserved tunnel.

[0014] Preferably, a roof anchor is provided at one end of the reserved tunnel at the cutting point close to the mining side, and the barrier net is connected to two adjacent roof anchors along the axial direction of the tunnel. The two adjacent barrier nets are overlapped with each other and connected with wire to form a barrier net connection area.

[0015] Preferably, a plurality of the top-cut supports are installed axially at equal intervals on one side of the reserved tunnel close to the goaf, and the bottom ends of the top-cut supports are pressed tightly against the bottom wing plates of the barrier net.

[0016] Preferably, when the working face is filled with solid waste, the filling body in the goaf is pressed against the bottom wing plate of the barrier net.

[0017] Preferably, the surface of the barrier net is sprayed to form a sprayed layer.

[0018] Preferably, the length of the barrier net connection area is 100mm-500mm.

[0019] Preferably, a base is provided at the bottom end of the cut-top bracket, and the base is arranged in contact with the bottom wing plate of the barrier net.

[0020] Compared with the prior art, the present invention has the following advantages and technical effects:

[0021] The present invention provides a method for cutting the top of a mining roadway in a solid waste filling working face and forming a roadway by retaining the top of the roadway. The reserved roadway and the goaf are separated by installing a blocking net, and the blocking net can ensure the high stability of the cutting top bracket and the roadway side support during implementation. The cutting top bracket is installed in the reserved roadway, and the top of the reserved roadway is depressurized. The depressurization advantage of the cutting top bracket is utilized to cut off the rock layer below the basic top along the edge of the goaf, thereby reducing the pressure of the goaf roof on the roadway. The cut rock layer is accumulated above the filling body to form a roadway side support body, which is beneficial to the maintenance of the reserved roadway. The present invention cuts the top of the mining roadway in the solid waste filling working face and forms a roadway by retaining the top of the roadway, which is beneficial to the maintenance of the reserved roadway, has a simple process, low cost, high stability of the retained roadway, and significant economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

[0023] Figure 1 It is a top view of the solid waste filling working face mining roadway of the present invention after the top is cut and the roadway is retained;

[0024] Figure 2 The present invention Figure 1 AA section view in;

[0025] Figure 3 The present invention Figure 2 Partial schematic diagram of the middle barrier net and the shotcrete layer;

[0026] Figure 4 The present invention Figure 2 A top view of the middle barrier net and a schematic diagram of its construction connection;

[0027] Figure 5 The present invention Figure 1 BB section diagram in;

[0028] Among them, 1. Coal seam; 2. Basic roof; 3. Roof rock layer below the basic roof; 4. Reserved tunnel; 5. Roof anchor rod; 6. Barrier net; 7. Goaf; 8. Top cutting support; 9. Shotcrete layer; 10. Barrier net connection area. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Reference Figure 1-Figure 5 The present invention provides a method for cutting the top of a mining roadway with solid waste filling working face and forming a roadway by self-retention, comprising the following steps:

[0032] Install a number of blocking nets 6 between the reserved tunnel 4 and the goaf 7;

[0033] A top cutting bracket 8 is installed in the reserved lane 4, the bottom end of the top cutting bracket 8 is arranged on the bottom of the blocking net 6, and the top end of the top cutting bracket 8 is in contact with the top end of the reserved lane 4;

[0034] Fill the goaf 7 with a filling body, cut off the rock layer below the basic top 2 along the edge of the goaf 7, and pile up the cut rock layer above the filling body to form a roadside support body, and remove the top cutting support 8.

[0035] As the working face advances, the above steps are repeated, and the top cutting support in the reserved tunnel 4 is removed after the roof of the goaf 7 collapses and stabilizes.

[0036] Further optimization schemes also include the mining height H1 of the coal seam 1, in m; the thickness of the top rock layer 3 below the basic top below the basic top 2 is the thickness H2 of the rock layer that can be cut off by the cutting bracket 8, in m; the crushing expansion coefficient K of the rock layer that can be cut off by the cutting bracket 8 A ; The minimum filling height of the filling body is H3, and H3 is obtained based on the preset relationship among H1, H2 and H3.

[0037] Further optimization scheme, the minimum filling height of the filling body is H3 = H1-K A H2+H4;

[0038] H4 is the connection height between the side support and the tunnel roof.

[0039] To further optimize the solution, the barrier net 6 is a double-layer woven "inverted T-shaped" structure, and the two wings at the bottom of the barrier net 6 are respectively placed in the goaf 7 and the reserved tunnel 4.

[0040] The barrier net 6 is a double-layer woven "inverted T-shaped" structure, and the two wings located in the goaf 7 and the reserved tunnel 4 are later compacted by the top cut support 8 and the filling material to ensure the stability of its overall structure.

[0041] To further optimize the solution, a roof anchor 5 is provided at one end of the reserved tunnel 4 at the cutting point close to the mining side, and a barrier net 6 is connected to two adjacent roof anchors 5 along the axial direction of the tunnel. The two adjacent barrier nets 6 are overlapped with each other and connected with wire to form a barrier net connection area 10.

[0042] Select the roof anchor rod 5 closest to the goaf 7 in the reserved tunnel 4 at the cutting point, hang the double-layer woven "inverted T-shaped" barrier net 6 on two adjacent roof anchor rods 5 along the axial direction of the tunnel, and overlap the two adjacent barrier nets 6 to achieve stable installation of the barrier net 6 between the reserved tunnel 4 and the goaf 7.

[0043] To further optimize the solution, a number of top-cut supports 8 are installed at equal intervals along the axial direction on one side of the reserved tunnel 4 close to the goaf 7. The bottom ends of the top-cut supports 8 are pressed tightly against the bottom wing plates of the barrier net 6, and the spacing between two adjacent top-cut supports 8 is 0.5m-2m.

[0044] The top cutting support 8 is located in the reserved tunnel 4, with the bottom end pressed on a wing plate on one side of the barrier net 6, and the top end supporting the top of the reserved tunnel 4. The pressure relief advantage of the top cutting support 8 is utilized to cut off the rock layer below the basic top 2 to reduce the pressure of the top plate of the goaf on the tunnel. The top cutting support 8 ensures stable support for the reserved tunnel 4. The spacing between the top cutting supports 8 is preferably 1m, and several top cutting supports 8 arranged at equal intervals ensure uniform force application.

[0045] To further optimize the solution, when the working face is filled with solid waste, the filling body in the goaf 7 is pressed against the bottom wing plate of the compression barrier net 6.

[0046] The filling body is pressed on the wing plate on one side of the barrier net 6 to further ensure the stability of the barrier net 6. At the same time, the top rock layer 3 below the cut basic top is piled on the filling body for compaction. The combination of the two forms a tunnel side support body, which has a simple process and low cost.

[0047] To further optimize the solution, the surface of the barrier net 6 is subjected to spraying treatment to form a spraying layer 9, and the thickness of the spraying layer 9 is 100mm-500mm.

[0048] The thickness of the spraying layer 9 is preferably 300 mm to ensure the stability of the overall structure.

[0049] Further optimization scheme, the expansion coefficient K A The range is 1.1-1.3, and the height of H4 is 0.1m-0.5m.

[0050] According to the further optimization scheme, the length of the barrier net connection area 10 is 100mm-500mm.

[0051] The barrier net connection area 10 ensures a stable connection between two adjacent barrier nets 6. Specifically, the mesh size of the barrier net 6 is smaller than the particle size of the solid waste filling body, thereby ensuring force blocking of the waste filling body.

[0052] To further optimize the solution, a base is provided at the bottom end of the cut-top bracket 8, and the base is provided in contact with the bottom wing plate of the barrier net 6.

[0053] The base is arranged to contact the bottom wing plate of the barrier net 6, thereby increasing the contact area and preventing the top-cutting bracket 8 from being inserted into the bottom.

[0054] The present invention is aimed at the solid waste filling working face, and uses the top cutting support to cut the rock layer below the basic top and build a roadside support body together with the filling body, which has a simple process and low cost. The roadside gangue is collected by the blocking net 6, and the top cutting support 8 and the filling body are respectively located on both sides of the blocking net 6, so that the blocking net 6 has a good gangue blocking ability. After the grouting and sealing, the roadway can be formed in one time, the stability of the remaining roadway is high, and the economic benefits are remarkable.

[0055] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0056] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for cutting the top of a mining roadway with solid waste filling working face and forming a roadway by self-retention, characterized in that: The following steps are involved: A plurality of blocking nets (6) are installed between the reserved tunnel (4) and the goaf (7); A top-cutting bracket (8) is installed in the reserved lane (4), the bottom end of the top-cutting bracket (8) is arranged on the bottom of the blocking net (6), and the top end of the top-cutting bracket (8) is in contact with the top end of the reserved lane (4); A filling body is filled in the goaf (7), and the rock layer below the basic roof (2) is cut off along the edge of the goaf (7). The cut rock layer is accumulated above the filling body to form a roadside support body, and the top cutting support (8) is removed.

2. A method for cutting the top of a mining roadway and forming a roadway by self-retention in a solid waste filling working face according to claim 1, characterized in that: It also includes the mining height H1 of the coal seam (1); the thickness of the top rock layer (3) below the basic top below the basic top (2) is the thickness H2 of the rock layer that can be cut off by the top cutting support (8); the minimum filling height of the filling body is H3, and H3 is obtained based on the preset relationship between H1, H2 and H3.

3. A method for cutting the top of a mining roadway and forming a roadway by self-retention in a solid waste filling working face according to claim 2, characterized in that: The minimum filling height of the filling body is H3 = H1-K A H2+H4; H4 is the connection height between the side support and the tunnel roof.

4. A method for cutting the top of a mining roadway and forming a roadway by self-retention in a solid waste filling working face according to claim 1, characterized in that: The barrier net (6) is a double-layer woven "inverted T-shaped" gabion net, and the two wings at the bottom of the barrier net (6) are respectively placed in the goaf (7) and the reserved tunnel (4).

5. A method for cutting the top of a mining roadway and forming a roadway by self-retention in a solid waste filling working face according to claim 1, characterized in that: A roof anchor rod (5) is provided at one end of the reserved tunnel (4) at the cutting point close to the mining side, and the blocking net (6) is connected to two adjacent roof anchor rods (5) along the axial direction of the tunnel. The two adjacent blocking nets (6) are overlapped with each other and connected with iron wire to form a blocking net connection area (10).

6. A method for cutting the top of a mining roadway and forming a roadway by self-retention in a solid waste filling working face according to claim 4, characterized in that: A plurality of the top-cut supports (8) are installed at equal intervals along the axial direction on one side of the reserved tunnel (4) close to the goaf (7), and the bottom ends of the top-cut supports (8) are pressed tightly against the bottom wing plates of the blocking net (6).

7. A method for cutting the top of a mining roadway and forming a roadway by self-retention in a solid waste filling working face according to claim 2, characterized in that: When the working face is filled with solid waste, the filling body in the goaf (7) is pressed against the bottom wing plate of the blocking net (6).

8. A method for forming a roadway by cutting the top of a mining roadway with solid waste filling working face according to claim 1, characterized in that: The surface of the barrier net (6) is subjected to a spraying treatment to form a spraying layer (9).

9. A method for forming a roadway by cutting the top of a mining roadway with solid waste filling working face according to claim 3, characterized in that: The length of the barrier net connection area (10) is 100mm-500mm.

10. A method for cutting the top of a mining roadway and forming a roadway by self-retention in a solid waste filling working face according to claim 6, characterized in that: A base is provided at the bottom end of the cut-top bracket (8), and the base is arranged in contact with the bottom wing plate of the barrier net (6).

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