关键词: 地应力, 优化反分析, 采动应力场, 综放工作面

Abstract: Value and orientation of in-situ stress play an important role in surrounding rock deformation, dynamic disaster and mining-induced stress field around the fully mechanized top-coal caving (FMTC) face, which was always little considered in the past related research work. The hollow inclusion strain gauge method was used to measure the in-situ stress in the south limb of Zhuxianzhuang(ZXZ) coal mine, and the original ground stress field has been feedback analyzed based on multi-objective constraints optimization method, while the results illustrate the optimum boundary loads and in-situ stress distribution. In addition, numerical models with FLAC3D have been established to investigate the influence law of mining-induced stress redistribution characteristics in FMTC mining face by the factors of the intersection angle between the longwall panel advancing direction and the maximum stress direction, the non-uniform coefficients of horizontal stress, and the lateral pressure coefficients, and so on. The results indicate that in-situ stress states has remarkable effect on mining-induced stress distribution and evolution characteristics of FMTC mining face. Finally, based on the real in-situ stress state, physical and mechanical parameters of coal-rock mass, and mining conditions of a coal face in ZXZ coal mine, the mine-induced stress distribution rules and its evolution process were further analyzed. Research results show that superposition and interaction of mining-induced stress and in-situ stress are important for strata management and roadway support in similar FMTC mining face.

Key words: in-situ stress, optimum back analysis, mining-induced stress, fully mechanized top-coal caving mining face