上硬下软反倾边坡变形破坏机理与稳定性研究

依托兰州至海口国家高速公路重庆至遵义段扩容工程YK71+590～+710右侧上硬下软反倾结构边坡工程，采用工程地质分析方法对边坡变形破坏机理进行分析，预测评价边坡稳定性。结果表明:坡体开挖和坡脚软弱地层遇水软化是发生变形破坏的主要控制因素；在现状条件下及开挖完成后，边坡稳定性均不能满足安全要求，必须进行治理，且应考虑边坡开挖完成后可能发生深层滑动。

Study on Deformation Failure Mechanism and Stability of Upper-hard Lower-soft Counter-tilt Slope

In relation to the upper-hard lower-soft counter-tilt slope engineering of Chongqing— Zunyi Section YK71+590~+710 expansion project along the Lanzhou—Haikou Natinal Highway, the engineering geological analysis method was used to analyze the deformation failure mechanism and predict the stability of the slope. The result shows that the slope excavation and the weak strata on the foot softened by water are the main factors causing deformation failure of the slope; in the status quo and after excavation, the stability of the slope can not meet the safety requirement; it is necessary to conduct the slope control and deep sliding which may happen after the excavation should be taken into consideration.