Research and Application of Filling Mining Technology Under Three Soft Strata

Liangjia Coal Mine is a typical soft rock mine with severe coal compression under buildings (structures). To solve the problem of coal compression mining under buildings, it actively seeks underground filling mining methods suitable for soft rock conditions. In view of the characteristic of soft rock being mined and extracted simultaneously, the constraint bottleneck is the lack of filling time and space. Based on the continuous research and analysis of the continuous mining and continuous filling process in the promotion catalogue of advanced and applicable technologies for coal mine safety production, combined with the actual situation of the mine, the feasibility of implementing filling mining in soft rock mines is systematically expounded. Through optimizing the working face design, filling process, support process, sealing process, etc., A targeted continuous mining and charging plan under soft rock conditions has been formulated. In combination with monitoring methods and tools such as anchor bolt dynamometers, roof separation meters, stress meters and displacement meters of the filling body, differentiated support measures were formulated for the double and single sides of the filling roadway, avoiding the risks of roof subsidence and side section collapse. Through on-site application, the maintenance problem of soft rock roof was solved, pioneering the filling mining of soft rock mines and filling the technical gap of soft rock filling mining. Form a set of key technologies for green mining using solid waste.