倾斜煤层综放沿空留巷围岩稳定性模拟研究
Simulation Study on Surrounding Rock Stability of Gob-side Entry Retaining at Fully-mechanized Working Face in Inclined Seam
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摘要: 以倾斜煤层综放工作面为研究对象,运用数值模拟的方法,从技术因素和地质因素2个方面,对煤层刚度、煤层埋深以及巷旁充填体强度不同时,沿空留巷围岩应力和位移随下区段工作面推进的动态分布和变化规律进行了模拟研究,以揭示不同工况条件对巷道围岩稳定性的影响规律。结果表明:煤层刚度越大,巷道围岩变形量越小,但两帮垂直应力越大;煤层埋深越大,巷道变形量和两帮垂直应力越大,但煤层埋深对煤层底板及巷旁充填体的影响相对较小;随巷旁充填体强度的增大,实体煤壁侧的垂直应力受影响较小,巷旁充填体侧垂直应力逐渐增大,巷道顶板和巷旁充填体侧位移逐渐减少,巷道底板和实体煤壁侧位移量逐渐增加。Abstract: Taking fully-mechanized caving face in inclined coal seam as the research object, the dynamic distribution and evolution of the surrounding rock stress and displacement of gob-side entry retaining with the advancing of lower coal working face were numerically simulated to reveal the influences of different working conditions on the surrounding rock stability according to the technical and geological factors under different seam stiffness, seam depth and intensity of roadway-side support. The simulation results show that with the increase of the seam stiffness, the deformation of surrounding rock of roadway decreases, but the two-side vertical stress increases. With the increase of the seam depth, the amount of deformation of roadway and the two-side vertical stress increase, and the influence of coal seam depth on the floor and roadway-side support is relatively small. With the increase of intensity of roadway-side support, the change of the solid-side vertical stress is smaller, and the roadside packing-side vertical stress increases; the displacement of the roof and roadside packing side decreases, and the displacement of the bottom and solid side increases.
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