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基于弹性理论建立了沿煤层走向采动底板受力力学模型,计算了煤层回采过程中底板内任一点处的剪应力大小。根据武所屯煤矿16105工作面采场条件,利用FLAC~(3D)数值仿真软件对工作面回采过程中底板的应力分布规律进行流固耦合数值模拟。研究表明:煤层回采后,采空区底板垂直应力等值线呈“椭圆型”分布,采空区底板垂直应力向底板深部先迅速减小后缓慢增加,且增加的幅度越来越小。工作面两侧采动底板剪应力等值线大致呈“泡型”分布,当工作面推进至工作面见方(工作面推进距离等于其斜长)期时,底板剪应力达到峰值12 MPa,此时底板剪切破坏最为严重,同时还模拟计算了16105工作面底板的最大破坏深度为15 m。
Based on the elastic theory, a mechanics model of mining bottom plate along coal seam is established, and the shear stress at any point in the bottom plate during coal mining is calculated. According to the stope conditions of 16105 working face in WuTuTun coal mine, FLAC 3D numerical simulation software is used to simulate the stress distribution law of floor during the process of face mining. The results show that the vertical stress contour of the bottom floor of the goaf is “oval” after mining, and the vertical stress of the bottom floor of the goaf slowly decreases first and then increases slowly, and the increasing range becomes smaller and smaller . The shear stress contour of the mining floor on both sides of the working face is roughly “bubble type” distribution. When the working face is pushed to the face of the working face (the advancing distance of working face is equal to the inclined length), the shear stress of the soleplate reaches the peak of 12 MPa , At this time the most serious shear failure of the floor, and also simulate the maximum damage depth of 16105 working face floor is 15 m.