Method for reclaiming house type remaining coal pillars based on filling and rebuilding of entry protection coal-pillar band

Abstract

The invention discloses a method for reclaiming house type remaining coal pillars based on filling and rebuilding of entry protection coal-pillar band, and belongs to reclaiming methods of house type remaining coal pillars in coal goafs. The reclaiming method of remaining coal pillars comprises the following steps: estimating and grading the stability of house type remaining coal pillars in a coal goaf; determining the width of entry protection coal pillars to be filled and rebuilt and the length of a band working face; performing an entry protection coal pillar filling and rebuilding technology; and performing a coal pillar reclaiming method and technology. According to the method, the minimum width of the entry protection coal pillars to be rebuilt, and the largest length of the band working face are determined according to the grades of the stability of the remaining coal pillars in the coal goaf; through the adoption of method for filling and rebuilding entry protection coal pillars, the stability of original coal pillars is greatly improved, so that the surface subsidence is controlled, and remaining coal pillar resources are reclaimed to the greatest extent; the purposes that the surface subsidence is reduced, the life and property safety of people in mining districts are protected, and the utilization ratio of resources is increased are realized. The method disclosed by the invention has the advantages of being simple, easy to operate, high in efficiency for filling and rebuilding entry protection coal pillars, and low in cost; the targets that the waste of resources is reduced, and the surface subsidence is controlled are realized, and the method can be widely applied.

Description

technical field [0001] The invention relates to a method for recovering leftover coal pillars in a room-type goaf, in particular to a method for recovering room-type leftover coal pillars by filling and rebuilding coal pillar strips in roadway protection. Background technique [0002] Most of the coal seams in the western coal fields of my country are buried shallowly. At the initial stage of mining, most coal mines adopt the room mining method, that is, unsupported coal houses with a width of 5m to 10m are mined vertically and horizontally in the coal seam, and square coal pillars of 5m to 10m are left at the same time. To support the roof and overlying strata, about 60% to 70% of the coal pillars in the mining area are left underground. Large-scale subsidence has seriously affected the safety of people's lives and properties in the mining area. [0003] How to develop a new coal mining method in view of the serious waste of coal pillar resources left in the shallow coal sea...

AI Technical Summary

Problems solved by technology

[0002] Most of the coal seams in the western coal fields of my country are buried shallowly. At the initial stage of mining, most coal mines adopt the room mining method, that is, unsupported coal houses with a width of 5m to 10m are mined vertically and horizontally in the coal seam, and square coal pillars of 5m to 10m are left at the same time. To support the roof and overlying strata, about 60% to 70% of the coal pillars in the mining area are left underground. Large-scale subsidence has seriously affected the safety of people's lives and property in the mining area

[0003] How to develop a new coal mining method in view of the serious waste of coal pillar resources left in the shallow coal seam type goaf in my country, large-area collapse and instability of coal pillars causing large-scale subsidence of the ground surface, seriously affecting the safety of people's lives and property in mining areas, etc. It is a scientific problem to be solved urgently to recycle the leftover coal pillar resources in the goaf to improve the resource utilization rate and reduce the surface subsidence to protect the life and property safety of the people in the mining area.

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