大采高浅埋深煤层覆岩破坏规律数值模拟

Numerical Simulation on Overburden Strata Failure Law of High Cutting Coal Mining Face in Shallow Depth Seam of Mine

黄土层地质条件复杂,尤其是在山区,使得煤层开采引起的地表变形移动规律与平原地区有着很大的不同,特别是对大采高,浅埋深煤层更是如此。文章以最具代表性的三道沟矿区为例,运用FLAC3D模拟计算大采高开采引起的沉陷规律,并与现场已有实测数据进行对比分析,得出:通过选取合适的边界约束条件(如模型前后为固定约束,模型表面为自由边界)及岩土物理参数,并对模型进行适当的简化,可以较为准确地模拟出地表沉陷破坏的初步规律,从而掌握将要开采区域未来可能的移动变形破坏情况,提前做好相应准备。此成果对黄土山区研究大采高,浅埋深煤层的地表变形移动规律具有一定的理论价值和科学实践意义。

： The geological condition of the loess layer was complicated, especially in the mountain area, the surface ground deformation and movement law caused by the seam mining would have big differences to the plain area and especially the high cutting coal mining in the shallow depth seam would have big differences. Based on the typical Sandaogou Mining Area as an example, the FLAC3D simulation was applied to calculate the subsidence law caused by the high cutting coal mining. A comparison analysis was conducted on the subsidence law and the available site measured data. The results showed that with the selection of the suitable boundary constraint conditions （ such as the front and rear of the model as the fixed constraint and the surface of the model as the free boundary ） and the rock and soil physical parameters, the model was properly simplified. Thus the preliminary law of the surface ground subsidence failure could be more accurately simulated and the surface ground movement and deformation failure conditions possibly occurred in the future mining area could be mastered in order to make relative preparation in advance. The results could provide certain theoretical value and scientific practical signifieances to the surface ground deformation and movement law above the high cutting mining face in the shallow depth seam in the loess mountain area.