井工开采作用下某露天矿边坡强度稳定性数值分析

根据平朔安太堡露天矿边坡的工程实际,运用数值分析方法对井工开采前后露天矿边坡的稳定性进行了分析,同时对边坡坡表和内部岩土体的速度矢量进行了预测研究.结果表明:自然状态下边坡的安全系数较高,井工开采作用会大幅度地降低边坡的稳定性;由数值模拟所得出的速度矢量图可知,坡表砂岩和泥岩接触面附近网格点的速度较大,易发生滑动,此处需要进行加固设计.最后考虑了岩土体的剪胀角ψ=φ/2时边坡的安全系数,结果表明:剪胀角为0时,边坡的安全系数较小;剪胀角为φ/2时,边坡的安全系数较大;四种工况的安全系数平均增大了4.2%.

Numerical analysis of an open-pit mine slope strength stability under the condition of underground mining

According to the engineering example of Antaibao open-pit mine in Pingshuo,numerical analysis method is used to analyze the stability of open-pit mine slope before and after underground mining.At the same time,the velocity vector on the slope surface and in the rock and soil mass is forecasted and researched.The results show that：the safety factor of slope in the nature state is larger,but the stability of slope will be greatly reduced by underground mining.It is known from the velocity vector graphs that the grid points speed near the contact surface of sandstone and mudstone is large,where the slope is prone to slide and the strengthening design is needed.Finally,the safety factor of the slope is considered when the rock and soil mass dilatancy angle isφ/2.The safety factor of the slope is small when the dilatancy angle is 0and the safety factor of the slope is large when the dilatancy angle is φ/2;the safety factors of four conditions increase by an average of 4.2%.