论文部分内容阅读
针对南梁煤矿冲沟地貌间隔式开采后采空区顶板破断垮落问题,根据矿井地质条件,采用了弯曲薄板理论,建立四边固支弹性矩形薄板模型,计算分析了薄板应力分布特征,认为最大拉应力在矩形薄板长边(工作面长度方向)中心位置处,最大拉应力值8 MPa。对比实验室测试结果得出确定南梁煤矿20305工作面开采后其采空区顶板发生垮落破断,为该矿井在下组煤开采、支架选型、顶板支护及巷道布置提供理论依据。
According to the geological conditions of mine, curved thin plate theory was used to establish four-sided fixed-supported elastic rectangular thin plate model. The stress distribution characteristics of the thin plate were calculated and analyzed, and the maximum was considered as the maximum Tensile stress at the center of the long side of the rectangular plate (face length direction), the maximum tensile stress of 8 MPa. Comparing with the test results of the laboratory, it is determined that the roof of the goaf in the 20305 working face of Nanliang Mine has been broken up and broken, which provides a theoretical basis for coal mining, bracket selection, roof support and roadway layout in the next group.