Abstract
To mine coal resources under extremely thick igneous rock safely, this paper analysed the disaster-causing mechanism of extremely thick igneous rock by the methods of theoretical analysis, physical simulation, and numerical simulation, which was based on the engineering condition of Panel No.104 in Yangliu Coal Mine. The movement laws of overlying strata were obtained through analysing fracture development and rock breaking under extremely thick igneous rock after mining. The breaking interval of extremely thick igneous rock overlying working face that has one side adjacent to goaf area was derived by establishing and calculating a thin elastic plate mechanical model with three fixed sides and one simply supported side. The research shows that the trigger for dynamic disasters under extremely thick igneous rock is the coupling process of stress field and fracture field. After breaking of igneous rock, the fracture field, flow field and gas concentration field coupled, resulting in dynamical gas disaster; energy field, impact field and stress field coupled, resulting in rock burst. From the perspective of controlling the stress field and fracture field development, backfill mining method is proposed to prevent extremely thick igneous rock from sudden breaking.
Published Version
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