Three-soft-coal-layer reciprocating-type coal-pillar-free fully-mechanized mining method

Abstract

The invention relates to a three-soft-coal-layer reciprocating-type coal-pillar-free fully-mechanized mining method which comprises steps as follows: a plurality of parallel adjacent working surfaces are arranged and exploited sequentially, wherein every two adjacent working surfaces are alternately exploited by a forward coal mining process and a backward coal mining process; in the drifting process, the roadway is combinedly supported by anchor rods, anchor cables, metal meshes and W-shaped steel tapes; and in the stoping process, the haulage roadway adopts gob-side entry retaining. The invention implements supporting in a combined support mode, and the anchor cables, anchor rods, metal meshes and W-shaped steel tapes constitute the support body; as the working surface exploitation lower gangway adopts gob-side entry retaining, the three soft coal layers have favorable support effect and entry retaining effect; and compared with the subsequent retreat-type coal mining, the invention can reduce the stoping roadway by 25-40% for one mining area, and enhance the resource recovery rate by 10-15%.

Description

technical field [0001] The invention relates to a coal mining method in a coal mine, in particular to a reciprocating coal pillar-free fully mechanized mining method applied to three soft coal seams. Background technique [0002] There are many three-soft coal seams in my country, the support is complex, and the safety of the roadway is poor. The existing support methods cannot meet the needs of underground safe production. [0003] At the same time, after the founding of the People's Republic of China, my country's coal mining methods have undergone major reforms, and the longwall retreating coal mining method has been generally implemented. It's hard to get used to it. Because the advance speed of the fully mechanized mining face is fast, the excavation is tense, which directly affects the maximum performance of fully mechanized mining and the further improvement of economic benefits. At the same time, the traditional retreating coal mining method needs to leave a large nu...

AI Technical Summary

Problems solved by technology

[0002] There are many three-soft coal seams in my country, the support is complex, and the safety of the roadway is poor. The existing support methods cannot meet the needs of underground safety production

[0003] At the same time, after the founding of the People's Republic of China, my country's coal mining methods have undergone major reforms, and the longwall retreating coal mining method has been generally implemented. Difficult to adapt

Because the advance speed of the fully mechanized mining face is fast, the excavation is tense, which directly affects the maximum performance of fully mechanized mining and the further improvement of economic benefits. At the same time, the traditional retreating coal mining method needs to leave a large number of coal pillars, which causes resource constraints. Serious waste

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