岩质边坡浅表层改造蠕动破坏机理探索与稳定性分析

山区边坡失稳常常造成交通堵塞、河流改道、人员伤亡等重大事故,带来极大的经济损失及安全隐患.基于对平溪河流域某边坡事故的详细地质勘察和测试分析,统计边坡出露结构面,研究并确定其历史形成机理,综合解译认为该边坡主要为浅表层改造逐渐形成,蠕动变形为主.结合现场踏勘及室内测试基本物理力学参数成果,采用二维极限平衡法和强度折减法对边坡各种工况下的稳定性进行评价,得出安全系数均不满足规范要求,最小为0.94.建议滑坡加固治理方案,为防护工程设计提供参考.

A Case Study on Creep Destruction Resulted from Exogenetic Reconstruction and Stability Evaluation of Rock Slope

Slope instability in mountain area often causes serious accidents such as traffic jams, river diversion and significant casualties, which also brings huge economic losses and potential safety hazard. Based on the detailed geological investigation and the test analysis of the slope of the Pingxi river valley, all structural planes exposed of the slope were surveyed, also the historical forming mechanism of the slope was studied. And the research results indicate the slope is formed gradually by reconstruction in the surface and the main deformation is creep. Combined with the site survey and the basic mechanical parameters from laboratory test, the two-dimensional stability numercial modelling in different cases was carried out based on the limit equilibrium method and the strength reduction method. The minimum safety factors derived is 0.94, which can not meet the specification. As a result, a landslide reinforcement scheme was suggested.