南桐煤矿急倾斜煤层开采过程中地表变形规律研究

为了研究南桐煤矿急倾斜煤层开采过程中地表变形特征，利用有限差分软件FLAC3D建立数值模型，分别计算先后开采K2，K3，K1三个煤层后地表变形的情况。模拟计算结果表明:地表竖向变形、水平变形都随着煤层的开采而逐渐增大；地表竖向变形受地形影响向下山方向逐渐减小；地表水平变形最大值位于采空区上方，变形方向都是指向下山方向，且下山变形增量大于上山变形增量；应力变化主要表现为地形地貌起伏大、地势低处拉应力集中。

Study on Law of Ground Deformation in Mining at Steep Seam in Nantong Coal Mine

To study the characteristics of ground deformation in mining at steep seam in Nantong Coal Mine, the finite difference software, FLAC3D, was used to establish a numerical model for the purpose of calculating the ground deformation after successive mining of the Coal Seam K2, K3 and K1, respectively. The simulation results show that, as the coal seams are mined, both the horizontal and vertical deformation of the ground increases; the vertical deformation, affected by the terrain, decreases gradually along the downhill direction; the horizontal deformation has its maximum value above the mined-out area with the direction pointing to the downhill direction, and the increment of deformation in the downhill direction is larger than that in the uphill; the variation of stress has a main manifestation of concentration of tensile stress at the low-lying place with large topographic relief.