Multi-stage ladder type structure filling and secondary mining method of left coal pillar groups in residual mining areas

Abstract

The invention discloses a multi-stage ladder type structure filling and secondary mining method of left coal pillar groups in residual mining areas. According to the method, on the basis of exploring and finding out the left coal pillar groups in the residual mining areas and the distribution conditions of the pillar mining areas, a multi-stage ladder type filling mold is installed, the left coal pillar groups in the residual mining areas are sequentially protected laterally in a pillar two-side layered filling mode, short-wall mechanical secondary mining working faces are arranged, and the left coal pillar groups in the residual mining areas are safely recovered. By means of the method, the increase of coal resource recovery rate and the improvement of enterprise economic benefits can be achieved, it can be avoided that under the multi-factor coupling effect, transient instability or domino instability and other dynamic disasters happen to stope pillar type filling bodies, and then the long-term stability of the stope pillar type filling bodies is ensured after residual coal secondary mining.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a method for filling abandoned coal resources in residual mining areas with a multi-level ladder structure, and is mainly suitable for safe mining of abandoned coal resources in residual mining areas. Background technique [0002] Restricted by historical technology, economic conditions, etc., many coal mines in my country at the beginning of coal resources have encountered phenomena such as mining thick and discarding thin, mining fat and discarding thin, mining good and discarding inferior, mining easy and discarding difficult, etc., resulting in the abandonment of many coal pillars. At the same time, many mining areas generally adopt column mining to maintain the stability of the overlying rock in the stope, thereby preventing or reducing damage to ground buildings, water bodies, and railways caused by mining. The above-mentioned mining activities left many criss-cross coal...

AI Technical Summary

Problems solved by technology

When the shock wave generated by the instantaneous instability of the stope filling body transfers and spreads to the adjacent filling body, it may cause the "domino" type of instability and failure of the stope filling body, and then cause dynamic disasters such as rock burst, and bring about surface subsidence and Damage and destruction of buildings, railways and water bodies

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