Method for pillar adjacency single side partial filling of ascending re-mining hollow coal seam

Abstract

The invention discloses a method for pillar adjacency single side partial filling of an ascending re-mining hollow coal seam. Based on discrimination of hollow coal seam ascending mining feasibility and ascertaining of distribution statuses of a knife-pillar type residual mining area coal pillar group and a knife-pillar type residual mining area empty area group, the method for pillar adjacency single side partial filling comprises that the hollow coal seam underlying knife-pillar type residual mining area coal pillar group is successively laterally protected, and hollow coal resources are gradually mined. A pillar adjacency single side partial filling body formed in the empty area group not only can play a role in laterally protecting the knife-pillar type coal pillar group, but also can form a common supporting body with the coal pillar group, so as to reduce the stress concentration degree and creep deformation of the coal pillar group, enhance the long-term stability, avoid occurrence of local instantaneous instability or 'domino' type instability damage, and ultimately ensure safe mining of a knife-pillar type residual mining area overlying hollow coal seam.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a method for partially filling an upward re-mined empty coal seam on one side of a pillar, and is mainly suitable for 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 an...

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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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