Coal face stump mining method

Abstract

The invention relates to a coal face stump mining method. The technical scheme adopted by the invention comprises the following steps: 1) the traditional mode is adopted to arrange the working face of the section; 2) when the section is mined, a stump with the width of 4-6m is left on one side of a ventilation drift along the mined-out region; 3) when the coal face advances 20-30m, a full hole is drilled on the stump to be communicated with the ventilation drift; 4) the coal wall of the stump is supported; 5) metal pillars are used between the stump and the mined-out region for temporary support; and 6) after the full hole is drilled, the metal pillars are drawn back in turn. The positive effects of the invention are as follows: the stump gob-side entry retaining method is adopted, the ventilation drift of the section is maintained to be used as the haulage drift of the lower curtate coal face, the initial resistance of the sides of roadway is increased, and the surrounding rock of gob-side entry retaining can be not damaged, thus the aim of entry retaining can be realized.

Description

technical field [0001] The invention relates to coal mining technology, in particular to a small coal pillar mining method. Background technique [0002] In coal mining, it is divided into reserved coal pillar mining and non-coal pillar mining. The reserved coal pillar mining method is to leave a coal pillar of more than 10 meters between every two mining sections, which is used to protect the return air lane of this section and facilitate the transportation of the next section. Although this method has high safety, the coal recovery rate is low and the roadway excavation rate is high. The coal pillar-free gobside roadway mining method is to use the roadside support method to reserve the roadway as the transportation level roadway in the next section when mining the previous section; this method has the advantages of high coal recovery rate and low roadway excavation rate. , but it is generally suitable for mining gently inclined coal seams and inclined thin and medium thi...

AI Technical Summary

Problems solved by technology

Although this method has high safety, the coal recovery rate is low and the roadway excavation rate is high

The coal pillar-free gobside roadway mining method is to use the roadside support method to reserve the roadway as the transportation level roadway in the next section when mining the previous section; this method has the advantages of high coal recovery rate and low roadway excavation rate. , but it is generally suitable for mining gently inclined coal seams and inclined thin and medium thick coal seams, and is affected by roof caving and geological structure, which seriously damages surrounding rocks. Improper roadside support method causes the bottom plate to be twisted and deformed, and the torsional force puts the roadway in a shear state, causing the roadway support system, especially the anchor rod and anchor cable, to be damaged due to shear force

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