Method for performing ascending re-mining on hollow coal bed by column with one completely-filled side

Abstract

The invention discloses a method for performing ascending re-mining on a hollow coal bed by a column with one completely-filled side. On the basis that the feasibility of ascending mining on a hollow coal bed is evaluated and the distribution of coal pillars and mined area in a pillar type mined area has been explored, a method by completely filling the single side of a column is carried out to protect the coal pillars in the pillar type mined area under the hollow coal bed, and thus the coal can be exploited gradually. The fillers, which are formed in the mined area and are near the columns, can protect the coal pillars and bear force together with the coal pillars, thus the stress concentration and creep deformation of the coal pillars are reduced, the stability of the coal pillars in the long term is enhanced, the local and instant disability is avoided or the domino-type destruction caused by disability is avoided, and thus the safe exploitation is guaranteed.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a method for filling all one side of a column side and up-recovering the empty coal seam, which is mainly applicable to the safe mining of the overlying empty coal seam in the 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 coa...

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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