A method for treating water accumulation in goafs in monocline mining areas with multiple coal seams

Abstract

The present invention discloses a method for treating water accumulation in the goaf of a monocline structure mining area with multiple coal seams. The working faces are arranged along the direction of the coal seams, and interconnected connecting lanes are arranged between adjacent lanes of adjacent working faces. A drainage lane is constructed between the lower lane of the working face with the lowest elevation and the protective coal pillar of the mining area along the protective coal pillar of the mining area. When the working face is pushed to the connecting lane, waterproof and airtight construction is constructed in the connecting lane, and drainage pipes and valves are installed. When the mining of the previous working face is completed and the next working face is mined, when the working face is pushed to the connecting lane of the previous working face, the connecting lane valve is opened to connect the goafs of the two working faces. Finally, the accumulated water in the drainage lane is pumped out. The present invention can prevent a large amount of accumulated water in the goaf from long-term seepage to the bottom plate of the overlying coal seam (the roof plate of the next coal seam), and reduce the occurrence of roof safety accidents.

Description

Technical Field

[0001] The invention belongs to the technical field of mining engineering, and in particular relates to the treatment of water accumulation in goaf during multi-coal seam mine mining, and specifically is a method for treating water accumulation in goaf suitable for multi-coal seam mining monocline structure mining areas. Background Art

[0002] For mines with multiple coal seams, water accumulation in the goaf of the overlying coal seams poses a huge threat to the safety of the next coal seam mining. The management of water accumulation in the goaf of the overlying coal seams is the key to ensuring the safe and smooth mining of the underlying coal seams. At present, most mines use geophysical exploration to detect water-rich areas in the overlying goaf before tunneling and working face mining in the underlying coal seams, and then use drilling to drain the water in the goaf in advance to ensure safe mining.

[0003] The disadvantage of this method is that all work is carried out when the underlying coal seam is being mined. If there is a lot of water in the goaf of the overlying coal seam, production may be affected in order to ensure the drainage of the accumulated water, safe tunneling of the tunnel and safe recovery of the working face. A large amount of water accumulated in the goaf will cause long-term seepage of the bottom plate of the overlying coal seam (the roof of the next coal seam), especially when the inter-layer spacing is small, which is not conducive to the management of the roof of the next coal seam and can easily cause roof safety accidents. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the object of the present invention is to provide a method for treating water accumulation in goaf areas applicable to multi-coal seam mining monocline structure mining areas.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A method for treating water accumulation in goafs in monocline mining areas with multiple coal seams.

[0007] The setting of each mining area is as follows: working faces are set along the direction of the coal seam, and multiple working faces are arranged in sequence from high to low; interconnected connecting lanes are set between adjacent lanes of adjacent working faces; the lower lane of the lowest working face is 20-30m away from the boundary of the mining area protection coal pillar, and a drainage lane is constructed between the lower lane of the lowest working face and the mining area protection coal pillar along the mining area protection coal pillar, and interconnected connecting lanes are set between the drainage lane and the lower lane of the lowest working face;

[0008] During the mining process: when the working face is pushed to the joint tunnel, waterproof and airtight construction is carried out in the joint tunnel, and a drainage pipe is installed with a valve; when the previous working face is mined and the next working face is mined, when the working face is pushed to the joint tunnel of the previous working face, the joint tunnel valve is opened to connect the goafs of the two working faces; after the mining of each working face is completed, the area where local water accumulation may occur and the possible amount of water accumulation are circled according to the measurement data of the working face and the water diversion conditions of each joint tunnel; the water accumulated in the drainage tunnel is pumped out;

[0009] Before mining the underlying coal seam: use drilling to conduct advance exploration and water drainage construction on the water-filled areas delineated in the goaf of the overlying coal seam.

[0010] For further optimization, during the construction of the working face tunnel, the position of the connecting tunnel is adjusted according to the elevation of the lower tunnel floor so that the connecting tunnel is located at the low points of the tunnel.

[0011] Furthermore, the drain pipe is located on the upper working surface side as a water inlet, and a valve is installed on the next working surface side for draining water.

[0012] Furthermore, the drainage tunnel was constructed to the lowest position of the lower tunnel of the last working face.

[0013] Several key points of the present invention:

[0014] (1) Most of the work on water accumulation control in the goaf of the overlying coal seam was carried out in advance during the design and construction of the overlying coal seam mining. This eliminated the hidden dangers of water inrush and roof safety during the mining of the underlying coal seam and improved the efficiency of tunnel construction and mining in the underlying coal seam.

[0015] (2) Make full use of the natural water flow slope of the coal seam floor and connect the goaf into one piece through the drainage pipes of the joint tunnels;

[0016] (3) Construct a drainage tunnel at the lower edge (lowest elevation) of the mining (pan) area to drain most of the water gushing from the goaf;

[0017] (4) By measuring data during the mining process, areas where local accumulation of water may occur in the goaf are circled to facilitate targeted treatment later.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention changes post-processing into early prevention and advanced design and construction. The goafs of the working faces of the overlying coal seam are connected by the drainage pipes of the connecting lanes. Most of the water in the goafs is gathered to the goafs of the working faces at the lowest elevation through the natural water flow slope of the coal seam floor. Finally, the drainage pipes of the connecting lanes are connected to the drainage lanes for discharge. When the tunnels of the underlying coal seam are excavated and mined, the water in small areas can be discharged by drilling. It is ensured that the accumulated water is drained and the long-term infiltration of a large amount of water in the goaf to the floor of the overlying coal seam (the roof of the next coal seam) is avoided, which is beneficial to the management of the roof of the next coal seam and avoids roof safety accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall layout of the mining area on the same layer in an embodiment of the present invention.

[0021] Reference numerals:

[0022] 1145~1110 are contour lines of different heights; 2S201~2S205 are different working faces; L1~L5 are connecting lanes; X1 is the drainage lane. DETAILED DESCRIPTION

[0023] Example 1

[0024] like Figure 1 As shown, a method for treating water accumulation in goaf area applicable to multi-coal seam mining monocline structure mining area is provided.

[0025] The setting of each mining area is as follows: the working face is set along the coal seam strike, and multiple working faces 2S201~2S205 are arranged in sequence from high to low along the mining area contour lines 1145~1110; interconnected connecting lanes L1~L5 are set between adjacent lanes of adjacent working faces; the lower lane of the lowest working face is 20-30m away from the boundary of the mining area protection coal pillar, and a drainage lane X1 is set between the lower lane of the lowest working face and the mining area protection coal pillar along the direction of the mining area protection coal pillar, and a interconnected connecting lane L9 is set between the drainage lane X1 and the lower lane of the lowest working face;

[0026] During the mining construction process of this embodiment:

[0027] (1) During the construction of the working face tunnel, the position of the connecting tunnel should be appropriately adjusted according to the elevation of the bottom plate of the lower tunnel to ensure that the connecting tunnel is located at the low points of the tunnel;

[0028] (2) During the mining process, the working face floor elevation is measured every time a certain distance is mined;

[0029] (3) When the working face is pushed to the joint tunnel, waterproof and airtight construction is carried out in the joint tunnel, and a drainage pipe of appropriate diameter is installed at the lower part of the airtight part according to the expected water volume: the drainage pipe is located on the side of the previous working face as the water inlet (measures are taken to block the gangue and protect it to prevent burial or blockage), and is located on the side of the next working face with a valve installed for water discharge; the diameter of the drainage pipe is determined according to the water volume near the joint tunnel, and the length is 3300mm;

[0030] (4) When the mining of the previous working face is completed and the next working face is mined, when the working face is pushed to the connecting lane of the previous working face, the connecting lane valve is opened to connect the goaf of the two working faces;

[0031] (5) After each working face is mined, the area where local water accumulation may occur and the possible amount of water accumulation are delineated based on the working face measurement data and the water diversion conditions of each joint tunnel. The accumulated water in the drainage tunnel is pumped out.

[0032] Before mining the underlying coal seam: use drilling to conduct advance exploration and water drainage construction on the water-filled areas delineated in the goaf of the overlying coal seam.

[0033] The length of the drainage tunnel extends to the lowest point of the pan area; the width is the normal tunnel width of the mine.

[0034] In this embodiment, a plurality of interconnected connecting lanes are arranged between adjacent lanes of adjacent working surfaces, and the connecting lanes are located at local low-lying points of the lanes.

[0035] A plurality of interconnected connecting tunnels may be arranged between the drainage tunnel and the lower tunnel of the working face with the lowest elevation, and the connecting tunnels are located at the local low-lying points of the tunnel.

[0036] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for treating water accumulation in goafs in a monocline mining area with multiple coal seams, characterized in that: The setting of each mining area is as follows: working faces are set along the direction of the coal seam, and multiple working faces are arranged in sequence from high to low; interconnected connecting lanes are set between adjacent lanes of adjacent working faces; the lower lane of the working face with the lowest elevation is 20-30m away from the boundary of the mining area protection coal pillar, and a drainage lane is constructed between the lower lane of the working face with the lowest elevation and the mining area protection coal pillar along the mining area protection coal pillar, and interconnected connecting lanes are set between the drainage lane and the lower lane of the working face with the lowest elevation; during the construction of the working face lane, the position of the connecting lane is adjusted according to the elevation of the bottom plate of the lower lane, so that the connecting lane is located at each low-lying point of the lane; during the mining process of the working face, the elevation of the bottom plate of the working face is measured every time a certain distance is mined; the drainage lane is constructed to the lowest position of the lower lane of the last working face; During the mining process: when the working face is pushed to the joint tunnel, waterproof and airtight construction is carried out in the joint tunnel, and a drainage pipe is installed with a valve; the drainage pipe is located on the side of the previous working face as the water inlet, and is located on the side of the next working face with a valve for draining water; the diameter of the drainage pipe is determined according to the amount of water collected near the joint tunnel; when the previous working face is mined and the next working face is mined, the next working face is pushed to the joint tunnel of the previous working face and the joint tunnel valve is opened to connect the goafs of the two working faces; after the mining of each working face is completed, the area where local water accumulation may occur and the possible amount of water accumulation are circled according to the working face measurement data and the water diversion conditions of each joint tunnel; the accumulated water in the drainage tunnel is pumped out; Before mining the underlying coal seam: use drilling to conduct advance exploration and water drainage construction on the water-filled areas delineated in the goaf of the overlying coal seam.

Images