某露天矿边坡岩体力学参数反演及稳定性分析

摘要

在边坡稳定分析中,岩体力学参数的选取直接影响着计算分析的结果.为了提高数值计算的准确性,根据滑坡现场实测数据,如滑移面半径、滑移面中心坐标和安全系数,结合正交试验、BP神经网络和极限平衡理论对断层、白云岩和云母岩的抗剪强度参数进行了反演.对比分析实测数据和计算结果,可以看出滑坡位置和范围比较接近,表明了该反演方法的可行性和准确性.最后采用反演结果对露天矿的深部开采进行了数值仿真分析,并以此对其稳定性做出评价.%In slope stability analysis, the selection of rock mechanical parameters has direct influence on the result of the calculation.In order to improve the accuracy of numerical simulation results,using the landslide measured data,such as the radius of sliding surface, sliding surface center coordinates and safety factor, and combining with orthotropic test, BP neural network and limit equilibrium theory, the back analysis of shear strength parameters of fault, dolomite and mica rock are carried out.Comparing monitoring data of landslide with the calculation results, the range and location of landslide is close to the monitoring data of landslide,which indicates that the method of this back analysis is feasible and accurate.Finally the inversion results are adopted to make numerical simulation analysis of deep mining for open-pit mine and make the evaluation of the stability.