基于灰色关联度分析的某矿山排土场边坡稳定性数值模拟研究

Numerical simulation study on slope stability of a mine dump based on grey correlation analysis

采用Geo-Studio有限元软件中的SEEP/W和SLOPE/W模块,对某露天矿排土场边坡进行了不同降雨类型(前峰型降雨、后峰型降雨、中峰型降雨、均匀型降雨)条件下的稳定性数值模拟研究,结果表明:不同降雨类型对边坡内部渗流特征影响程度不同,其中前峰型降雨的渗流特征变化幅度最大;边坡安全系数的变化与渗流特征变化趋势相同,渗流特征变化幅度越大,边坡安全系数下降越快。为确定边坡稳定性影响因素的敏感度,基于灰色关联度分析理论,采用正交试验对各因素进行了灰色关联度分析,结果表明:各影响因素的敏感度排序为内摩擦角>内聚力>土体容重>降雨强度>排土体渗透系数,其中土体容重和内聚力的关联度相差不大。

The modules SEEP/W and SLOPE/W of the finite element software Geo-Studio were used to perform the numerical simulation study and stability analysis of the dump slope in an open-pit mine under different types of rainfall conditions(front peak rainfall,back peak rainfall,intermediate peak rainfall and uniform rainfall).The results show that the impact of the rainfall on the seepage characteristics inside the slope varied with the type of rainfall.The seepage characteristics varied in the greatest range in case of the front peak rainfall.The safety factor of slope changed in the same way as the seepage characteristics.The greater range the seepage characteristics changed,the more quickly the safety factor of slope dropped.In order to determine the sensitivity of the factors influencing on the slope stability,based on the grey correlation analysis theory,the orthogonal test was carried out to analyze the grey correlation of each factor.The results show that the sensitivity order of the influencing factors can be described as follows:internal friction angle,cohesion,soil density,rainfall intensity,permeability factor of dump soil among which the correlation of soil density does not differ from cohesion greatly.