Coal Mining Method Without Coal Pillar and Gobside Entry in the Whole Underground Section

Abstract

The invention discloses a full well work area section non-pillar goaf-side-drift-free coal mining method, which comprises the following steps of: performing section transportation drift and coal mining working face digging to form a single-folding-corner two-section roadway; installing a leakage type air supply passage at the section transportation drift and the coal mining working face to convey fresh air flow to the single-folding-corner two-section roadway; using the single-folding-corner two-section roadway as an air return passage to combine the single-folding-corner two-section roadway and the leakage type air supply passage into a ventilation system of the roadway, wherein no section isolation pillar and no goaf-side drift exist in the layout of the single-folding-corner two-section roadway. The method has the advantages that the arrangement of the roadway is reasonable and simple; the roadway digging and maintenance workload is reduced; the cost of roadway digging equipment, surrounding rock support, salaries and the like is reduced; the surrounding rock support problem caused by the goaf-side drift is avoided; and the extraction rate on coal resources is improved, so that the air quantity distribution in the roadway is reasonable.

Description

technical field [0001] The invention relates to the field of mining engineering, in particular to a coal mining method with no coal pillars and gob-side entry in the whole underground section. Background technique [0002] In the process of traditional underground mining, it is necessary to lay out the section transportation entry 1a, the coal mining face 2 and the section return air entry (i.e. gobside entry) 3 along the layered coal body within the mining range of the section. In the double-angle three-section roadway formed by combination, section isolation coal pillars 4 are reserved between adjacent sections, and the coal mining face 2 is arranged with end support 7a, hydraulic support 7b, coal shearer 8 and scraper conveyor 9 and so on, the section transport entryway 1a is arranged with track 13, belt conveyor 14, equipment train, etc., and the section is left with isolated coal pillars and the double-knuckle three-section arrangement of the gob-side entry coal mining ...

AI Technical Summary

Problems solved by technology

[0003] Generally, the width of isolated coal pillars between adjacent sections is between 3 and 50m. These isolated coal pillars have not been exploited, resulting in a large amount of coal loss; Due to the influence of high lateral support pressure caused by violent rock movement, strong mine pressure phenomena such as severe roof subsidence, severe lamina and strong floor heaving often occur, requiring a lot of manpower, material and financial resources to ensure the safety and smoothness of the roadway, especially when the isolated coal When the column width is small, the mine pressure will be further intensified along the goblin level roadway; during the mining process of the working face in this section, the advanced abutment pressure and the lateral abutment pressure are superimposed, making roadway support more difficult. Within the range of ~50m, the surrounding rock of the roadway is very easy to collapse and collapse. Therefore, it is extremely difficult to maintain the roadway near the goaf 5 side of the adjacent section

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