基岩裸露山区煤层倾角对地表移动规律的影响研究

Study on seam inclination variation affected to ground surface movement law in base rock exposed mountain area

为了分析基岩裸露山区煤层倾角变化对地表移动规律的影响,根据重庆松藻矿区石壕煤矿某工作面的地质、地貌和采矿条件为原型,利用Auto CAD与Sufer软件建立山区地表模型,并采用FLAC3D建立裸露基岩山区不同倾斜煤层开采数值模型。根据模拟结果分析得到:1在采空区边缘区域,地表下沉量与水平移动受山区地表滑移的影响较大,地表斜坡坡度越大,其影响越大;在山顶和山谷区域,地表下沉变化较为平滑;2倾斜煤层开采与水平煤层开采走向方向地表下沉、水平移动特征与规律一致;3随着开采煤层倾角的增大,地表最大下沉量将变小,指向上山方向的地表水平移动值增大;采空区上覆岩层下沉量、地表下沉量沿工作面中心的对称性越不明显,各覆岩层最大下沉量越往下山方向偏移。

In order to analyze the seam inclination variation affected to the ground surface movement law in a base rock exposed mountain area,according to the geology,geomorphology and mining condition of a coal mining face in Shihao Mine of Chongqing Songzao Mining Area as a model,the Auto CAD and Sufer Software were applied to establish the terrain model of the mountain area and a FLAC^3D was applied to establish a numerical model of the different inclined seam mining in the base rock exposed mountain area. The analysis on the simulation results showed that firstly at the edge area of the goaf,the ground surface subsidence value and horizontal movement were highly affected by the ground surface sliding in the mountain area and the higher gradient of the surface slope,the higher influences would be. At the mountain peak and the valley areas,the ground surface subsidence variation would be smooth. Secondly,the ground surface subsidence and the horizontal movement features above the inclined seam mining and horizontal seam mining in the strike direction would be the same to the law. Finally,with the inclination of the mining seam increased,the max subsidence value of the ground surface would be decreased and the ground surface horizontal movement value at the rise direction would be increased. Along the symmetry of the coal mining face center,the subsidence value of the overburden strata above the goaf and the ground surface subsidence value would be not more obvious and the max subsidence value of each overburden strata would be offset to the dip direction.