Coal pillar and wall combined support waterproof structure

Abstract

The utility model relates to a coal pillar and wall combined support waterproof structure, which belongs to the technical field of coal mining, and comprises a roof rock stratum part, a bottom plate rock stratum part, a waterlogging goaf, a reserved coal pillar, a roadway area and a coal seam part to be mined, the roadway area is located between the reserved coal pillar and a coal seam to be mined, and a waterproof wall is arranged on the side, close to the roadway, of the reserved coal pillar; the waterproof walls and the reserved coal pillars are provided with connecting assemblies, and positioning grooves allowing the ends of the waterproof walls to be embedded therein are formed in the bottom face of the top plate rock stratum part and the top face of the bottom plate rock stratum part correspondingly. The coal pillar and wall combined support waterproof structure is convenient and fast to construct, and can show excellent stability, safety and waterproofness.

Description

Technical Field

[0001] This utility model relates to the field of coal mining technology, and in particular to a waterproof structure that combines coal pillars and walls for support. Background Technology

[0002] With the in-depth development of mineral resources, traditional mining faces many new technical and safety challenges. In particular, in coal mining, as society places higher demands on the recovery rate of coal resources, small pillar and pillarless mining are being promoted more and more.

[0003] However, recent field practices of gob-side roadway retention and excavation have shown that current gob-side roadway retention and excavation techniques are only suitable for conventional mining conditions. When coal seam mining conditions are more complex, these techniques cannot be applied to engineering production. One such challenge is mining near goaf areas with accumulated water, a common production problem in many mines. Large amounts of water accumulate in goaf areas adjacent to the existing working face, and the mining of new working faces must take into account the stability of the coal pillars and their interaction with the waterproofing wall.

[0004] Based on the phenomena described above, most mines have to adopt wide coal pillar mining to avoid water inrush, mud inrush, and even mine water seepage accidents that may occur under such conditions. This seriously hinders the improvement of coal resource recovery rate. To address this, the inventors have provided a waterproof structure that combines coal pillar and wall support for mining small coal pillars under unilateral high water pressure. Utility Model Content

[0005] The purpose of this utility model is to provide a waterproof structure that combines coal pillar and wall support, which solves the safety problem of small coal pillar mining under unilateral high water pressure environment and improves the recovery rate of coal resources.

[0006] This utility model provides a combined support and waterproof structure for coal pillars and walls, employing the following technical solution:

[0007] A combined coal pillar and wall support waterproof structure includes a roof stratum, a floor stratum, a waterlogged goaf, a reserved coal pillar, a roadway area, and a coal seam to be mined. The reserved coal pillar is located on the side closest to the waterlogged goaf, and the roadway area is located between the reserved coal pillar and the coal seam to be mined. A waterproof wall is provided on the side of the reserved coal pillar closest to the roadway.

[0008] The waterproof wall and the reserved coal pillar are equipped with connecting components, and the bottom surface of the roof rock layer and the top surface of the bottom rock layer are respectively provided with positioning grooves for the ends of the waterproof wall to be embedded.

[0009] Preferably, a wedge-shaped block is provided on the side of the waterproof wall near the reserved coal pillar, and a fixing groove for the wedge-shaped block to be embedded is provided on the side wall of the reserved coal pillar.

[0010] Preferably, the connecting assembly includes anchor cables that penetrate the waterproof wall horizontally and extend into the interior of the reserved coal pillar, and multiple sets of anchor cables are provided.

[0011] Preferably, the wedge angle of the wedge block is 10-30°.

[0012] Preferably, the distance between each group of anchor cables does not exceed 1m.

[0013] Preferably, the width of the waterproof wall is 1 / 5 of the width of the reserved coal pillar.

[0014] In summary, this utility model has the following beneficial technical effects:

[0015] 1. In this utility model, by connecting a waterproof wall to the side of the reserved coal pillar away from the waterlogged goaf, and using the reserved coal pillar and the waterproof wall for joint support, the width of the reserved coal pillar is reduced, the recovery rate of coal resources is improved, and by opening positioning grooves in the roof strata and the floor strata, the waterproof wall and the reserved coal pillar form an effective waterproof structure.

[0016] 2. The waterproof wall in this utility model is provided with wedge-shaped blocks, and the reserved coal pillar is provided with a fixing groove for the wedge-shaped blocks to be embedded. The waterproof wall and the reserved coal pillar are connected by anchor cables, which enhances the support stability and waterproofness of the waterproof wall and the reserved coal pillar.

[0017] 3. The waterproof structure in this utility model is simple to construct. By opening positioning grooves in the top and bottom rock layers near the reserved coal pillars and opening fixing grooves on the surface of the reserved coal pillars, then pouring waterproof walls, and then using anchor cables to connect the waterproof walls and the reserved coal pillars, an effective waterproof support structure can be quickly formed. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a combined coal pillar and wall support waterproof structure provided in an embodiment of this utility model;

[0019] Figure 2 This is a structural diagram of a waterproof wall.

[0020] Explanation of reference numerals in the attached drawings: 1. Roof strata; 11. Positioning groove; 2. Floor strata; 3. Waterlogged goaf; 4. Reserved coal pillar; 41. Fixing groove; 5. Roadway area; 6. Coal seam to be mined; 7. Waterproof wall; 71. Wedge block; 8. Connecting component. Detailed Implementation

[0021] The following is in conjunction with the appendix Figure 1-2 The present invention will be described in further detail below.

[0022] This utility model provides a combined support and waterproof structure for coal pillars and walls, referring to... Figure 1 It includes a roof rock layer 1, a floor rock layer 2, a waterlogged goaf 3, a reserved coal pillar 4, a roadway area 5, and a coal seam to be mined 6. The reserved coal pillar 4 is located near the waterlogged goaf 3. The roadway area 5 is located between the reserved coal pillar 4 and the coal seam to be mined 6. A waterproof wall 7 is provided on the side of the reserved coal pillar 4 near the roadway. A connecting component 8 is provided between the waterproof wall 7 and the reserved coal pillar 4.

[0023] Reference Figure 1 and Figure 2 Positioning grooves 11 are respectively provided on the bottom surface of the roof rock layer 1 and the top surface of the bottom rock layer 2. The positioning grooves 11 are located near the reserved coal pillar 4. In this embodiment, the height of the positioning grooves 11 is 0.5 meters. A fixing groove 41 is provided on the side of the reserved coal pillar 4 near the roadway. The cross section of the fixing groove 41 is wedge-shaped. A waterproof wall 7 is poured on the side of the reserved coal pillar 4 near the roadway. A wedge-shaped block 71 is formed on the side of the waterproof wall 7 near the reserved coal pillar 4 that is embedded in the fixing groove 41. The top and bottom ends of the waterproof wall 7 are respectively embedded in the positioning grooves 11. In this embodiment, the waterproof wall 7 and the reserved coal pillar 4, after being poured with the positioning groove 11, fit tightly together to form a strong connection, effectively preventing structural deformation and water seepage. The wedge angle of the wedge block 71 is 10-30°. The wedge angle of the wedge block 71 is selected based on the construction difficulty and the compressive strength of the coal, thereby improving the connection's firmness. In practice, the greater the compressive strength of the waterproof wall 7 and the reserved coal pillar 4, the smaller the wedge angle of the wedge block 71. In this embodiment, the width of the reserved coal pillar 4 is 8-12 meters, and the width of the waterproof wall 7 is 1 / 5 of the width of the reserved coal pillar 4, that is, the width of the waterproof wall 7 is 1.6-2.4 meters.

[0024] Reference Figure 1 The connecting component 8 includes anchor cables 81, which penetrate the waterproof wall 7 horizontally and extend into the interior of the reserved coal pillar 4. In this embodiment, multiple sets of anchor cables 81 are provided, and the distance between each set of anchor cables 81 does not exceed 1m. The anchor cables 81 firmly connect the waterproof wall 7 and the reserved coal pillar together, so as to evenly distribute the stress on the waterproof wall 7 and the reserved coal pillar 4. The anchor cables 81 prevent displacement of the waterproof wall 7 and the reserved coal pillar 4, reduce the generation of gaps between the waterproof wall 7 and the reserved coal pillar 4, and enhance the stability, integrity, safety and waterproofness of the structure.

[0025] The implementation principle of this utility model of a combined coal pillar and wall support waterproof structure is as follows:

[0026] Positioning grooves 11 are excavated at the locations of the top rock layer 1 and the bottom rock layer 2 near the reserved coal pillar 4, and fixing grooves 41 are opened on the surface of the reserved coal pillar 4. A waterproof wall 7 is poured, and the waterproof wall 7 forms a wedge-shaped block 71 embedded in the fixing groove 41. Both ends of the waterproof wall 7 in the vertical direction are embedded in the positioning groove 11. After curing and shaping, the waterproof wall 7 and the reserved coal pillar 4 are connected by anchor cables 81, which can quickly form an effective waterproof support structure. The structure in this utility model is simple to construct, and the mechanism has stability, integrity, safety and waterproofness.

[0027] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A combined coal pillar and wall support waterproof structure, comprising a roof stratum (1), a floor stratum (2), a waterlogged goaf (3), a reserved coal pillar (4), a roadway area (5), and a coal seam to be mined (6), characterized in that, The reserved coal pillar (4) is located on the side near the waterlogged goaf area (3), the roadway area (5) is located between the reserved coal pillar (4) and the coal seam to be mined (6), and a waterproof wall (7) is provided on the side of the reserved coal pillar (4) near the roadway. The waterproof wall (7) and the reserved coal pillar (4) are provided with connecting components (8), and the bottom surface of the roof rock layer (1) and the top surface of the bottom rock layer (2) are respectively provided with positioning grooves (11) for the end of the waterproof wall (7) to be embedded.

2. The combined support and waterproof structure of coal pillar and wall as described in claim 1, characterized in that, The waterproof wall (7) is provided with a wedge block (71) on the side near the reserved coal pillar (4), and the side wall of the reserved coal pillar (4) is provided with a fixing groove (41) for the wedge block (71) to be embedded.

3. The combined support and waterproof structure of coal pillar and wall according to claim 1, characterized in that, The connecting assembly (8) includes an anchor cable (81) that penetrates the waterproof wall (7) in a horizontal direction and extends into the interior of the reserved coal pillar (4). Multiple sets of the anchor cables (81) are provided.

4. The combined support and waterproof structure of coal pillar and wall according to claim 2, characterized in that, The wedge angle of the wedge block (71) is 10-30°.

5. The combined support and waterproof structure of coal pillar and wall according to claim 3, characterized in that, The distance between each set of anchor cables (81) shall not exceed 1m.

6. The combined support and waterproof structure of coal pillar and wall according to claim 1, characterized in that, The width of the waterproof wall (7) is 1 / 5 of the width of the reserved coal pillar (4).

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