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“挡墙溃屈”型滑坡是一类典型的大型岩质边坡破坏失稳模式,锁固段的物理力学性能为该类边坡稳定性的控制因素。依据此类边坡的受力特征,将上部坡体按其地质结构(如岩体层面)划分计算条块,采用极限分析上限法求出上部坡体对锁固段的作用力(方向和大小)。通过对锁固段的极限剪切平衡分析,推导了剪切破坏模式下锁固段的稳定性系数计算公式。以四川溪口滑坡为例进行了应用分析。首先根据稳定性系数与锁固段剪切面倾角的关系,确定锁固段最危险截面位置。进而定量分析了最危险截面宽度与边坡稳定状态的相关性。研究成果对“挡墙溃屈”型滑坡的稳定性评价及灾害控制具有较好的指导意义。
“Landslide ” landslide is a typical failure mode of large-scale rock slope failure, the physical and mechanical properties of the locking section is the control factor for the stability of this type of slope. According to the stress characteristics of such slopes, the upper slope is divided into sections according to its geological structure (for example, the rock mass level), and the upper limit of the upper slope body is determined by the upper limit analysis method (orientation and size ). Based on the analysis of the ultimate shearing equilibrium of the locking section, the formula for calculating the stability coefficient of the locking section under the shear failure mode is deduced. Taking Xikou landslide in Sichuan as an example, the application and analysis are carried out. First of all, according to the relationship between the stability coefficient and the shear angle of the locking section, the position of the most dangerous section of the locking section is determined. Then the correlation between the width of the most dangerous section and the stability of the slope is quantitatively analyzed. The research results have a good guiding significance for the stability evaluation and disaster control of “landslide collapse”.