边坡局部稳定性变化规律的研究

Variable Rule of Slope Local Safety Factor

现有边坡稳定性分析方法大多假定边坡滑面各部位的安全系数相等,既不能反映边坡潜在滑面上稳定系数的分布规律,也不符合工程实际情况。分别基于超载储备安全系数定义和强度储备安全系数定义研究了边坡局部稳定性变化规律,并分析了滑体条块数目以及滑面形状对边坡局部稳定性分布规律的影响。此外,还提出了由局部稳定系数求解整体稳定系数的加权方法。研究结果表明:滑体条块的划分数量对边坡局部稳定性的分布规律几乎没有影响,而滑面形状对其影响较大;取微段下滑力占各微段下滑力代数和的比值作为权重,是由边坡局部安全系数加权计算整体安全系数的最优加权方法。

Most of the methods of slope stability analysis assume that each part of the sliding surface of slope has the same safety factor,which not only fails to reflect the distribution rule of stability coefficient of the slope slip surface but also fails to accord with the reality of the slope program. We have studied the distribution rule of slope local stability based on the safety factor definition of the over-loading reserve and strength reserve,respectively,and we also analyzed the influence of the sliding block number and shape of sliding surface to the distribution rule of slope local stability. Besides we proposed the weighted method to solve the global safety factor by local ones. The study shows that the amount of the sliding block has negligible influence on the distribution rule of slope local stability,but the shape of the sliding surface has great one. Furthermore,it is reasonable to make the ratio of micro section slide force and the sum of all of the micro section slide force as the weight to solve the global safety factor by local ones. This paper studies the influence of the sliding body slice number and sliding surface form on the distribution of local slope stability,summarized the method of weighted integral stability coefficient by local stability coefficients.