A method of double-sided full filling of pillars and upward re-mining of the empty coal seam

Abstract

The invention discloses a method of a beside-pillar double-side total-filling ascending re-mining overhead coal seam. In the invention, on the basis of determining overhead coal seam mining feasibility and detecting distribution situations of a coal pillar group and a mined area group of a reamer-pillar remnant mining area, a beside-pillar double-side total-filling method is employed for successively side-protecting the coal pillar group in the underlie reamer-pillar remnant mining area of the overhead coal seam and gradually mining the overhead coal resources. By means of the method, a beside-pillar double-side filling body formed in the mined area group can not only achieve a side-protecting effect on the reamer-pillar coal pillar group but also form a common bearing body therewith, thereby further reducing degree of stress concentration and creep deformation of the coal pillar group. The method can enhance long-term stability, can avoid local instantaneous unstability or domino-like unstable damage and finally can ensure safe mining of the overhead coal seam of the reamer-pillar remnant mining area.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a method for filling all sides of columns next to an upward re-mining empty coal seam, which is mainly applicable to the safe mining of an overlying empty coal seam in a knife-pillar residual mining area. Background technique [0002] At present, the contradiction between limited coal resources and unlimited consumption demand is becoming increasingly prominent. The re-mining of residual coal is an important measure to alleviate the above contradictions. The re-mining of residual coal can not only increase the recovery rate of coal resources and improve the economic benefits of enterprises, but also prolong the service life of mines and promote sustainable development. [0003] In recent years, upward mining in the residual mining area of ​​coal mines has increasingly become the focus of attention. Affected by early mining, the integrity and stability of the empty coal seam...

AI Technical Summary

Problems solved by technology

At this time, the failure wave generated by the instantaneous instability of the above-mentioned coal pillars may transfer and spread to the adjacent coal pillars, causing the "domino"-style instability and failure of the coal pillars in the knife-pillar residual mining area, which in turn affects the overlying push-off The integrity and stability of the coal seam and its floor strata may even cause disasters such as rock bursts, threatening safe and efficient production

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