Method for completely filling two sides of pillars with repeated mining and residual mining area remaining coal pillars

Abstract

The invention discloses a method for completely filling two sides of pillars with repeated mining and residual mining area remaining coal pillars. The method comprises the steps that on the basis of exploring and finding out remaining coal mining area remaining coal pillar and pillar mining area distribution positions, sizes and the like, remaining coal mining area remaining coal pillars are laterally protected sequentially by adopting the method for complete filling of the two sides of the segmentation pillars, conveyor gateways and air return gateways are tunneled in filling bodies on the two sides of the pillars, and short-wall mechanical working face repeated mining and residual mining area remaining coal pillars are arranged. According to the method, the residual mining area remaining coal pillars are sufficiently utilized, the contradiction between the coal resource finiteness and consumer demand infiniteness is relieved, instant instability or domino instability and other dynamic disaster happening on the pillar-type system mining remaining coal pillars under the effect of long-term creep deformation are avoided, and meanwhile safe repeated mining of the residual mining area remaining coal pillars is ensured by means of the filling bodies on the two sides of the pillars.

Description

technical field [0001] The invention relates to the technical field of coal mining, in particular to a method for completely filling the leftover coal pillars in a re-mined residual mining area on both sides of a pillar, and is mainly suitable for safe mining of the residual coal pillars in the residual mining area. 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 min...

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

Images