风脉寺滑坡前缘阻滑体不同产状稳定性研究

Study on the Stability of Fengmaisi Landslide Based on Different Occurrence of Anti-sliding Body in the Leading Edge

为研究前缘阻滑体产状对滑坡稳定性的影响,以风脉寺深层特大型滑坡为例,在分析滑坡工程地质特征及形成机理的基础上,通过极限平衡法分析并构建前缘阻滑型滑坡力学模型,得到前缘反倾砂砾岩倾角与滑坡稳定性系数的关系。通过构建的力学模型和数值计算,研究了在反倾砂砾岩倾角分别为10°、20°、30°共3种工况下,滑体的位移分布及稳定状况。结果表明:前缘阻滑型滑坡表现出明显的后缘推移挤密现象,滑体变形主要集中在坡体后部;前缘阻滑体倾角与滑体位移呈负相关性,与稳定性系数呈正相关性;前缘阻滑型滑坡力学模型与数值计算得到的稳定性系数具有相同的规律。研究成果可为前缘阻滑型滑坡稳定性评价提供借鉴。

To analyze the effect of the occurrence of anti-sliding body in the leading edge on landslide stability,Fengmaisi landslide as an example,on the basis of analysis of geological characteristics and formation mechanism,relationship between the glutenite anti-dip angle and the stability coefficient was obtained through the mechanical model constructed by limit equilibrium analysis.The distribution of displacement and stability condition of the slide were studied through both the mechanical model and numerical simulation considering three sorts of glutenite anti-dip angle(10°,20°,30°).The results showed that squeezing and compaction phenomenon was distinct at the trailing edge for slide due to the locked section in the front,and the deformation mainly occurred in the rear.The anti-dip angle showed a negative correlation with the displacement,and a positive correlation with the stability coefficient.Stability coefficients obtained by the mechanical model had a similar change regulation to that of numerical simulation.The results will provide a reference for evaluation of anti-sliding body stability.