Method for ladder-structured filling and re-mining of remnant coal pillar groups in remnant mining areas

Abstract

The invention discloses a method for ladder-structured filling and re-mining of remnant coal pillar groups in remnant mining areas. According to the method, filling molds are constructed and mounted on the basis that the remnant coal pillar groups in the remnant mining areas and the pillar mining area distribution condition are explored and made clear, the remnant coal pillar groups in the remnant mining areas are sequentially subjected to side protection in the manner of double-side filling beside each pillar, and a mechanized short-wall re-mining working face is arranged, and the remnant coal pillar groups in the remnant mining areas are recovered safely. With the adoption of the method, the mining rate of coal resources can be increased, the economic benefits of enterprises can be increased, besides, dynamic disasters such as instant instability, domino instability and the like occurring to pillar type filling bodies in the mining areas under the coupling function of multiple factors can be avoided, and accordingly, long-term stability of the pillar type filling bodies in the mining areas after re-mining of remnant coal is guaranteed.

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 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 pillars of ...

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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