某铁矿充填法采矿引起的地表变形的Flac分析

Analysis of Surface Settlement Caused by Ground Mining with Filling in an Iron Ore by Flac

地下采矿必然会引起采空区围岩的崩塌,围岩向采空区的移动可能涉及到地表,造成地表的陷落.采用充填法,留矿柱法等措施能够减轻地表的沉降.本文借助Ansys进行网格划分后,将其导入Flac数值计算软件中.Flac软件能模拟开采、回填、再向下开挖、再回填等过程,与实际开采和充填一致.对金山店铁矿东区分别进行不充填、20%充填、50%充填的地下开采进行模拟,研究采矿引起的地表沉降问题.分析得出下盘稳定性好于上盘,水平位移和垂直位移在量级上相当,充填越多越能减轻地表沉降.

Underground mining will cause the collapse of goaf surrounding rocks and movement of surrounding rock to goal may effect on the surface, so as to cause surface collapse. The measures such as pillar method and filling method can reduce the settlement of the ground surface. With Powerful modeling and meshing capabilities of Ansys software, the grid is meshed by Ansys and then imported into Flac software. Flac can simulate the mining and filling; and then mining and filling; this process is consistent with the actual mining and filling. Different methods of filling with not filling, 20% filling and 50% filling are simulated to the analyze surface settlement in the East district of the Jinshandian Iron Mine. The stability in the below plate is better than in the upper plate, horizontal and vertical displacements are identical in magnitude; and more filling can reduce the settlement of ground surface.