Water drainage method for simultaneously exploiting water and coals under complicated hydrological condition

Abstract

The invention discloses a water drainage method for simultaneously exploiting water and coals under a complicated hydrological condition. The method comprises the following steps of: constructing a dedicated water drainage tunnel connected to a working face in a coal layer in a water enrichment region of a coal layer top plate, and constructing a sedimentation pool at the tail end of the water drainage tunnel; forming a water drainage tunnel along a conveying belt tunnel; forming communicating holes for communicating the conveying belt tunnel and the water drainage tunnel in the conveying belt tunnel at intervals, arranging a vibration sieve at the tail end of the water drainage tunnel, and forming another coal conveying tunnel behind the vibration sieve; drilling water drainage holes in the water drainage tunnel for the water enrichment region of the coal layer top plate, so that a part of top plate water can be drained in advance, after the water is drained, draining the water into the sedimentation pool through the water drainage tunnel, and after sedimentation, draining the water into a water bin at the bottom of a well; and after a part of the top plate water is drained in advance, executing working face exploitation when the water is continuously drained. By the method, aiming at the water yield property of the coal layer, the top plate water is drained from the dedicated water drainage tunnel in advance; water drainage and coal exploitation are simultaneously executed, so that pressure of in-advance water drainage and crossheading water drainage are reduced; and the conventional single water drainage mode of the working face is changed.

Description

technical field [0001] The invention belongs to the technical field of coal mining. Background technique [0002] The coal reserves threatened by water in my country's key coal mines are about 25 billion tons, of which the coal reserves threatened by surface water bodies (rivers, rivers, lakes, seas, etc.), loose aquifers, and bedrock aquifers are nearly 10 billion tons. In terms of the influence of rivers alone, more than 200 mines are threatened by more than 100 large and small rivers, and the coal fields in North China, East China, and Northeast China are generally covered by Quaternary and Tertiary unconsolidated aquifers, resulting in their mining benefits. Coal seams in relatively best shallow outcrops are difficult to mine. [0003] Coal mine roof permeation is a very complex problem affected by many factors. It is affected by geological conditions and structures, hydrogeological conditions, and artificial mining conditions. It can be summarized as four factors: wate...

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Problems solved by technology

[0007] The purpose of the present invention is to propose a drainage method for simultaneous mining of water and coal in order to ensure the safe mining of large water coal seams in view of the problem that coal mining and roof water pre-release cannot be carried out simultaneously under complex hydrological conditions and the problem of effective drainage

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