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以嘉乐泉煤矿9号煤二采区及上覆8号煤采空区为背景,研究了下层煤巷道所受到近距离上覆煤层采空区及煤柱的影响。运用FLAC3D有限元软件分析了下层煤回采巷道与上覆煤层采空区及煤柱的水平、垂直相对位置不同时巷道周围的应力分布特征、屈服破坏范围及稳定性。研究表明:位于采空区下的区域为应力降低区,随着与采空区垂直距离增加应力逐渐增大,位于煤柱下的区域为应力升高区,在一定范围内随着距离增加应力逐渐减小。巷道应尽量布置在采空区下应力降低区,同时应内错采空区7 m以上,如遇特殊地段则要加强支护。
Taking the No. 9 coal second mining area and the overlying No. 8 coal gob area of Jialequan Coal Mine as the background, the influence of overlying coal seam gob area and coal pillar on the lower seam roadway was studied. The finite element software FLAC3D is used to analyze the stress distribution, yield failure range and stability of the underground coal roadway and overlying coal seam gob and coal pillar at different vertical relative positions. The results show that the area under the goaf is the stress reduction area, and the stress increases with the increase of the vertical distance to the goaf. The area under the coal pillar is the area of stress rise, which increases with the distance within a certain range slowing shrieking. Roadway should be arranged in the mined-out area to reduce the stress area, at the same time should be the wrong goaf 7 m above, in case of special sections will have to strengthen the support.