关键词: 软煤, 大采高, 断层, 煤壁稳定, 应力集中

Abstract: The paper studied the rib stability of working face with large mining height in very soft coal seam when the working face approaching the fault based on the project of coal mining, and gives out the mechanism of the rib spalling near the fault. The main three reasons are tectonic stress, the physical and mechanical properties of coal and rock, and the breaking of main roof, which make the rib occur shear failure and even tensile failure near the fault. The analysis is made by the numerical of FLAC3D. According to the ananlysis, the closer of the distance between the working face and the fault, the more serious of the destructure of the main roof and floor of coal seam, the larger of the distance of coal wall and the edge of the main roof, and the higher of the ratio of the rib spalling. Besides, proposed the main engineering ways of preventing the rib spalling near the fault.

Key words: soft coal, high mining face, fault, coal wall stability, stress concentration