Method for draining roof water in flood mine

Abstract

The invention discloses a method for draining roof water in a flood mine, which comprises the following steps: before a working face is mined, firstly constructing drainage ditches in a track lane and a belt lane and forming water storage drilling pits at intervals; forming a hydrophobic channel parallel to the belt lane below the belt lane, arranging a water-coal body separation facility at the tail end of the hydrophobic channel, forming through eyes at intervals in the middle of the belt lane, communicating the belt lane with the hydrophobic channel through the through eyes, forming a water retaining structure at the through position, then forming drainage boreholes in a coal seam roof in the track lane at the upper part and the belt lane at the lower part and pre-draining the roof water; and mining the working face while the roof water is pre-drained and enabling muddy water generated by the working face to enter the hydrophobic channel from the through eyes till to flow into the water-coal body separation facility. The flood mine roof water drainage method has the benefits that two hydrophobic purification channels, i.e. a pre-draining channel and a working face water-coal body channel are designed aiming at the water abundance of the roof water and are not mutually affected in the drainage, and working face coal mining and drainage are synchronously performed.

Description

technical field [0001] The invention belongs to the technical field of coal mining. Background technique [0002] In the field of coal mining technology, a mine with a daily water inflow of more than 10,000 tons or more than twice the normal daily water inflow is called a large water mine. [0003] 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. [0004] Coal mine roof permeation is a very complex problem...

AI Technical Summary

Problems solved by technology

Therefore, the water released in advance from the roof and the muddy water on the working face enter the underground water tank together, which will make it more difficult for the separation of water and coal in the underground water tank in the future, and the drainage will become more difficult.

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