House pillar type coal mining method

Abstract

The invention provides a room-and-pillar coal mining method which comprises the following steps: (1) chemical filling material is adopted to fill the bordroom after mining so as to support the top plate of the bordroom; (2) coal pillars remained at both sides of the bordroom are recovered; and (3) sealing is carried out to the mining area. By adopting the room-and-pillar coal mining method, not only the total recovery rate of coal resources can be greatly improved, but also safe production can be ensured.

Description

technical field [0001] The invention relates to a novel room-and-pillar coal mining method, more specifically, a coal mining method for fully recovering corner coal in underground coal mines. Background technique [0002] Coal mining methods are mainly divided into long-wall mining and short-wall mining, of which short-wall mining is mainly used in small mine fields with low degree of mechanization and corner blocks of large mine fields. For a long time, the main form of short wall mining in my country is room and pillar mining. In the traditional room-and-pillar mining method, it is typical to dig a roadway in the coal seam, mine coal rooms at a certain distance on both sides of the roadway, and leave coal pillars on both sides of the coal room. The size of the coal room and coal pillars Depending on the technical conditions of coal seam mining, the coal output of the mine mainly comes from the coal room and the coal seam roadway. In the process of mining, a large number ...

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Problems solved by technology

[0003] There are mainly five safety issues in short-wall mining: 1. Due to the large number of coal pillars left, room-and-pillar mining has always faced the problem of low resource recovery rate, and the total recovery rate of coal resources is generally 15% to 40%.

2. The space area of ​​the coal house is relatively large, and there is a relatively serious hidden danger of roof collapse

3. A large amount of coal room space makes ventilation difficult, easy to accumulate gas, and gas accidents will occur

4. A large number of coal pillars left in the goaf can easily cause coal to spontaneously ignite

It is easy to form old pond wind and breeze operation during production

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