煤层开采对边坡稳定性的动态影响研究

为了研究煤层开采过程中对边坡稳定性的影响,采用强度折减法对采动条件下不同物理力学参数的边坡稳定性进行了计算和分析,得到了边坡粘聚力c不同折减百分比下安全系数的大小。采用莫尔-库伦强度准则对ANSYS软件计算得到的各节点的应力进行判断分析,得出了边坡不同物理力学参数下的塑性区和滑动面位置。研究结果表明,采动对边坡的扰动程度越大,边坡的物理力学参数降低越多,所对应的安全系数也就越小,在一定范围内安全系数与粘聚力c的折减百分比成线性变化。

Study of Dynamic Impact on Slope Stability Under Coal Mining

In order to study the impact of the coal mining process on slope stability,using the strength reduction method,the slope stability of different physical and mechanical parameters under coal mining conditions were calculated and analyzed,the safety factor of slope cohesion c under different discount percentages is received.Using Mohr-Coulomb strength criterion to analyze the stress of each node,which is calculated by the ANSYS software.The plastic zone and the sliding surface location in different physical and mechanical parameters of the slope are received.The results show that the greater degree of coal mining disturbing to the slope,the more decreasing in the physical and mechanical parameters of slope,and the smaller corresponding safety factor is,in a certain range,safety factor linearly changes with the decrease percentage of cohesion.