Treatment method for roof disasters in large dipped coal seams

Abstract

The invention discloses a treatment method applied to disaster of a steeply dipping seam roof and belongs to the technical field of safe production process of coal mining. The treatment method applied to disaster of the steeply dipping seam roof is capable of effectively ensuring the safety of mechanical mining under the condition of the oblique coal seam hard roof and greatly reducing the coal mining risk under such condition. The treatment method comprises the following steps: weakening and exploding a pull trough of a roof in a cutting hole of a coal mining layer of a working surface; weakening and exploding the roof of the roof of the coal mining layer of the working surface in advance according to a certain step pitch along the trough through an air returning roadway and a transportation roadway; exploding a roof at a corner of the tail roadway of the air returning roadway of the working surface, and so on, and repeating the corresponding steps according to the coal mining progress in accordance with the step pitch till the roof of the coal mining layer of the whole working surface is weakened and removed, thereby completing the treatment on the disaster of one steeply dipping seam roof.

Description

technical field [0001] The invention relates to a treatment method, in particular to a treatment method for roof disasters in large-inclination coal seams, and belongs to the technical field of coal mining safety production technology. Background technique [0002] The general situation of a working face representing the hard and smooth roof and floor type of the coal seam is as follows: the mining coal seam of the working face is defined as the 1# coal seam, the strike length is about 562m, the average inclination length is about 94m, the average inclination angle of the coal seam is about 40°, and the average mining height of the coal seam is 3.0m Left and right; the roof and floor of the coal seam after mining are characterized by being hard and smooth, and it is very difficult for people to stand and walk, especially the roof of the coal seam is hard and complete. Roof and floor conditions of this working face: there is no false roof and direct roof on the working face, ...

AI Technical Summary

Problems solved by technology

The roof will not collapse directly with the gravity when the working face is mining and advancing, and it often has to extend far, usually tens of meters or even more than 100 meters, before it collapses as a whole, which has great impact on the mining of the working face, personnel and equipment The biggest safety risk is also the most important and direct cause of roof fall accidents.

Compared with the conventional working face, the hard and hard-to-break roof working face has the following potential safety hazards: one is the distance from the mining pressure, the other is the generation of storms, the third is the roof cutting, and the fourth is a large amount of gas gushing out or even a gas explosion

Images