构造应力环境下倾角对急倾斜矿体开采岩移规律的影响

Influence of Dip Angle on the Rock Mass Movement Law of Steep Inclined Orebody Mining Under Tectonic Stress Environment

为了研究构造应力环境下矿体倾角对急倾斜矿体开采岩移规律的影响,基于离散单元法3DEC,分析了构造应力(σh/σν=1.5)环境下,矿体倾角分别为50°,60°,70°,80°,90°时开采引起的地表与围岩移动变形规律。结果表明:既有条件下,地表最大沉降量随倾角的增大而减小,下盘地表最大水平移动量随倾角的增大而增大,上盘地表的最大水平移动量随倾角的增大而减小;随着矿体倾角增大,上盘围岩最大移动变形量和采动影响范围减小,而下盘围岩最大移动变形量和采动影响范围则增大。

In order to study the influence of dip angle on the rock mass movement law of steep inclined orebody mining under tectonic stress environment,based on the discrete element method of 3 DEC,the movement and deformation laws of surface and surrounding rock caused by mining in the dip angle of orebody of 50°,60°,70°,80°and 90°were analyzed under the tectonic stress(σh/σν=1.5).The results show that under the existing conditions,the maximum surface subsidence decreases with the increase of dip angle,the maximum horizontal displacement in the lower wall increases with the increase of dip angle,and the maximum horizontal displacement in the upper wall decreases with the increase of dip angle.With the increase of dip angle of orebody,the maximum displacement deformation and the mining influence range decrease in upper wall,while increase in lower wall.