软弱夹层顺层岩质滑坡形成机制及稳定性分析

MECHANISM AND STABILITY ANALYSIS OF SOFT LAMINATED ROCK LANDSLIDE

以贵阳西二环"5·20"滑坡为实例,对滑坡区地质环境条件,滑坡发育特征和变形破坏特征的分析,在工程建设过程中,切脚开挖形成临空面是诱发软弱夹层岩质顺层滑坡,滑坡破坏模式为滑移-拉裂型;采用室内岩土试验、工程类比分析和参数反演等方法,综合确定了滑坡物理力学参数,应用极限平衡法和数值模拟对滑坡稳定性进行定量分析;分析表明,在天然和饱和两种工况条件下,稳定性系数均小于规范要求,在暴雨或外力作用下形成滑坡的结论,理论分析和实际情况一致。

Taking the “5·20” landslide of Guiyang West Second Ring Road as an example, the analysis of the geological environment conditions, landslide development characteristics, and deformation and damage characteristics in the slope area, it is believed that the formation of the foot excavation surface during the construction of the project is to induce the weak laminar landslide. The failure mode of landslide is sliding-cracking;By means of indoor geotechnical test, engineering analogy analysis and parameter inversion, the physical and mechanical parameters of landslide were determined. The analysis shows that the stability coefficient is less than the standard under natural and saturated conditions. The conclusion of landslide formation under heavy rain or external force is consistent with the actual situation.