Method for improving stability of strip coal pillar

Abstract

The invention discloses a method for improving stability of a strip coal pillar and relates to the technical field of coal mining. The method comprises the steps that firstly, according to geologicalconditions of a coal bed, the width of a first strip working face haulageway and the width of a way expansion area are designed, then when the haulageway is driven for a certain distance, way expansion reinforcement is conducted along the side of the strip coal pillar. The roof of the way expansion area is supported in metal net laying and anchor rod drilling modes, then anchor rod drilling is conducted in the direction perpendicular to the strip coal pillar to achieve supporting, afterwards a separation wall is built on the other side of the way expansion area, and after separation, gangue paste is poured to the way expansion area. The above steps are repeated alternately till driving of the first strip working face haulageway and reinforcement of the way expansion area are completed, andin the same way, driving of a second strip working face ventilation roadway and reinforcement of a way expansion area are completed. Through the method, the overall structure of gangue paste-an anchor rods-the coal pillar-an anchor rod-gangue paste can be formed, thus bearing capacity of the strip coal pillar is enhanced, and stability is high.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a method for improving the stability of strip coal pillars. Background technique [0002] In the coal mining of buildings and structures, strip mining is one of the effective means to control surface subsidence, and has become the main technical method of coal mining under villages and under buildings and structures that are not suitable for relocation in our country. The coal pillar left by strip mining needs to have sufficient strength and stability to effectively support the weight of the overlying strata. However, during the mining process, the width of the striped coal pillars is not enough to support the weight of the overlying strata. Many factors will lead to instability of the coal pillars, large-scale collapse of the roof, and large-scale subsidence of the ground surface. Therefore, improving the stability of strip coal pillars is the key technology for strip minin...

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the above-mentioned defects in the prior art, the present invention proposes a method for improving the stability of the strip coal pillar. The bearing capacity of the coal pillar can prevent the coal pillar from being unstable and damaged. This method can also reduce the reserved width of the strip coal pillar and improve the recovery rate of coal resources.

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