According to the specific geological condition, analyzed the stress distribution ofthe overlying strata, the displacement of pressure released seam, thickness variation andthe distribution of plastic zones by FLAC^(3D...According to the specific geological condition, analyzed the stress distribution ofthe overlying strata, the displacement of pressure released seam, thickness variation andthe distribution of plastic zones by FLAC^(3D) software to simulate mining of the long-distancelower protective seam.The research results show that the distribution of verticalstress appears as a 'Double-hump' within the pressure-relief range of the protected coalseam and the swelling deformation curve of coal bodies takes an 'M' shape.The swellingis divided into initial swelling, swelling increase and swelling compression stability.Themaximum swelling ratio of the pressure released seam is 1.84%, protection angle of thelower protective coal seam along the strike direction is about 55°, protection angle belowthe dip direction is about 50°, protection angle above the dip direction is about 55°, andthe coal seam compression zone resembles a 'U' shape.展开更多
基金Supported by the Basic Research Program of National Natural Science Foundation of China(50834005)
文摘According to the specific geological condition, analyzed the stress distribution ofthe overlying strata, the displacement of pressure released seam, thickness variation andthe distribution of plastic zones by FLAC^(3D) software to simulate mining of the long-distancelower protective seam.The research results show that the distribution of verticalstress appears as a 'Double-hump' within the pressure-relief range of the protected coalseam and the swelling deformation curve of coal bodies takes an 'M' shape.The swellingis divided into initial swelling, swelling increase and swelling compression stability.Themaximum swelling ratio of the pressure released seam is 1.84%, protection angle of thelower protective coal seam along the strike direction is about 55°, protection angle belowthe dip direction is about 50°, protection angle above the dip direction is about 55°, andthe coal seam compression zone resembles a 'U' shape.