Overlying strata separation water pumping and draining structure and construction method

Abstract

The invention relates to the technical field of mineral resource mining, in particular to a structure for pumping and draining overlying strata separation water and a construction method.According to the structure, a drainage well is arranged above a mining working area or above an adjacent goaf and penetrates through a separation space, a screen pipe is arranged in the drainage well, and accumulated water above the mining area is effectively pumped and drained through the structure; the drainage well is supported by the screen pipe and not prone to hole collapse, water in the aquifer can be continuously drained to the separation space, accumulated water in the aquifer can be fully drained as much as possible, and the possibility of water inrush in the mining operation area is reduced. According to the method, the positioning hole is firstly formed, the positioning hole drill bit is small in hole diameter, and the positioning effect is good. The hole diameter of the second-order drill hole is large, and after the second-order drill hole is inserted into a protection wall, hole blockage caused by collapse after a drill bit is pulled out when the first-order hole is formed can be prevented. And the second-order drill hole is formed to the water-bearing layer, the water-bearing layer is hard rock, and therefore the supporting effect on the second-order casing pipe is good. And finally, the drainage device is placed in the hole, and construction work is completed.

Description

technical field [0001] The invention relates to the technical field of mineral exploration, in particular to a structure and a construction method for pumping and draining water from overlying rocks. Background technique [0002] After the coal seam is mined in the mine, the overlying stratum is unevenly damaged and deformed due to the difference in thickness, lithology and strength, and transverse cracks will appear between the upper and lower strata of different hardness, which is the so-called separation layer. [0003] When the overlying rock layer is a water-rich rock layer and the underlying rock layer is a soft rock layer, it will accumulate into a layer water body within a certain period of time. With the continuous advancement of the working face and the accumulation of time, the water volume and water pressure in the closed abscission space continue to accumulate. When the working face advances a certain distance, the overlying stratum breaks and becomes unstable, ...

AI Technical Summary

Problems solved by technology

[0007] The embodiment of the present invention provides a structure and a construction method for pumping and draining layer-separated water from overlying rocks, which are used to solve the problem of unstable water inrush prevention and control effects in the prior art when grouting or introducing layer-separated water into underground

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