以国道G316线安康~汉阴段K25附近膨胀土公路滑坡为例,分别运用非饱和土强度理论的Fredlund强度公式以及饱和土的有效应力原理,分析了该膨胀土公路滑坡滑带土强度破坏的力学机理,同时运用FLAC2D数值方法模拟了其运动机理与过程,得出了膨胀土公路边坡开挖前后的应力、位移、应变及弹塑性状态变化的规律。 Taking the expansive soil highway landslide near the K25 Ankang ~ Hanyin section of National Highway G316 as an example, this paper analyzes the strength failure of landslide landslide with expansive soil by using the Fredlund intensity formula of unsaturated soil strength theory and the effective stress principle of saturated soil, respectively Mechanics, and simulate the movement mechanism and process by FLAC2D numerical method, and get the law of stress, displacement, strain and elastoplastic state before and after excavation of expansive soil highway slope.