露井同期联采对边坡稳定性的影响规律研究

结合某露井联合开采工程实例, 采用有限元软件建立三维模型并通过有限差分法计算边坡体的位移与应力, 研究了多阶段露井联采对边坡稳定性的影响特点及其边坡位移应力分布状况, 结果表明, 联采过程中采空区两侧在上覆岩体连续下落时边坡中上部岩体一方面向井工区方向下沉, 另一方面朝临空自由面方向位移, 边坡下部岩体表现出“倾倒”的位移特征; 随着井工开采不断推进, 整个露天矿边坡都处于井采沉陷区, 边坡岩土体强度在节理裂隙面逐渐发育张开的过程中逐步减弱, 最终导致边坡破坏。

Influence of Combined Method of Opencast and Underground Mining on Slope Stability

An engineering practice with the combined method of opencast and underground mining was taken for studying slope stability. A three-dimensional model was established by using finite element analysis software and the displacement and stress of the slope were calculated by using the finite-difference method. The influence on the slope stability and the distribution of stress caused by slope displacement at the multi-stage of the combined mining of opencast and underground were all explored. The results show that during the combined mining process, the rock mass on the upper and middle part of the slope body sink in the direction of the underground working area when the overlying rock masses on both sides of the goaf are continuously falling down, and there is also a displacement towards the free surface of the slope, showing a “toppling” deformation for the rock mass in the lower part of slope with displacement. With the continuous advancement in the underground mining, the slope of the open-pit mine will be completely within the mine subsidence district. The strength of rock-soil slope gradually becomes weak as the joints and surface fissure gradually develop and become wider, which will eventually lead to the slope failure.