关键词: 大倾角大采高松软煤层, 力学参数试验, 围岩应力分布, 数值模拟

Abstract: In order to effectively improve the situation of frequent roof accidents in coal mines in Gui⁃ zhou Province，the 7# coal seam and 11074 working face of Panzhihua Coal Mine in Liupanshui，Guizhou Province were taken as the research object to study the surrounding rock stress of mining roadway. The exper⁃ imental study on the mechanical parameters of the roof of 7# coal seam was carried out. It was found that the uniaxial compressive strength，elastic limit，yield strength，strength limit and uniaxial tensile strength of the roof rock specimen after soaking saturation were 19.51%，29.52%，63.38%，39.77% and 20% lower than those after natural drying. In terms of shear strength，the failure load of the same specimen will de⁃ crease when the shear angle increases，and the cohesion of the specimen will decrease and the internal fric⁃ tion angle will increase after soaking at the same shear angle. The numerical simulation of stress distribution law of floor rock mass in 11074 working face of Panzhihua Coal Mine in Liupanshui，Guizhou Province was carried out by FLAC^3D . The results showed that when one side of coal pillar was mined out，with the increase of vertical distance，the peak stress gradually shifted to the rear away from the center of coal pillar，the change rate of vertical stress was low，and the peak value of vertical stress tended to be stable. When the coal pillar is mined out on both sides，with the increase of the vertical distance from the coal pillar，the peak stress gradually shifts to the front position away from the center of the coal pillar，and the peak stress gradu⁃ ally tends to be stable and increases slightly. When the coal pillar is mined on both sides and the width of the coal pillar is twice the width of the original coal pillar，with the increase of the vertical distance from the coal pillar，the stress change of the lower rock stratum gradually tends to be stable，and the influence of the coal pillar on the stress distribution of the floor is further reduced.

Key words: soft coal seam with large dip angle and large mining height, mechanical parameter test, surrounding rock stress distribution, numerical simulation