Method for filling bilateral parts beside pillar with repeatedly-mined left-over coal pillars in residual mining area

Abstract

The invention discloses a method for filling bilateral parts beside a pillar with repeatedly-mined left-over coal pillars in a residual mining area. According to the invention, on the basis of exploration and identification of the left-over coal pillars in the residual mining area, the distributive locations and sizes of pillar mining areas, lateral protection of the left-over coal pillars in the residual mining area are successively carried out by using a sectioned filling method for the bilateral parts beside the pillar; a conveyor gateway and an air return gateway are dug in bilateral filling bodies beside the pillar; and short-wall mechanization working faces are arranged for repeated mining of the left-over coal pillars in the residual mining area. The method provided by the invention makes full use of the left-over coal pillars in the residual mining area, alleviates contradiction between finiteness of coal resources and infiniteness of consumer demands, avoids transient instability, domino instability or other dynamic disasters caused by coal pillars left by pillar mining under action of long-term creep effect, and guarantees safe repeated mining of the left-over coal pillars in the residual mining area by using the bilateral filling bodies beside the pillar.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a method for partially filling leftover coal pillars in re-mined residual mining areas on both sides of pillars, and is mainly suitable for safe mining of leftover coal pillars in residual mining areas. Background technique [0002] In recent years, the re-mining of the remaining coal pillars in the residual mining area has increasingly become the focus of attention, and it has good mining value. The remaining coal pillars in the residual mining area can alleviate the contradiction between the limited coal resources and the unlimited consumption demand, not only can improve the recovery rate of coal resources, improve the economic benefits of enterprises, but also prolong the service life of mines and promote sustainable development. [0003] Due to the constraints of technology, economy and other factors, in order to pursue short-term interests in some coal mines in my count...

AI Technical Summary

Problems solved by technology

At this time, the failure wave generated by the instantaneous instability of the remaining coal pillars may transfer and spread to the adjacent coal pillars, which may cause the "domino" type of instability failure of the remaining coal pillars, and then cause dynamic disasters such as rock bursts, and bring Surface subsidence and damage to buildings, railways and water bodies

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