通过分析软弱结构面的形成,利用有限元方法,建立有限元数值模型。对深挖方膨胀土渠坡数值模拟的机理分析既考虑了浅表层受到的大气影响,也考虑了在不同土层界面存在软弱结构面导致渠坡发生深层滑坡破坏等因素,从土体位移、土体塑性应变、安全稳定性系数这几个方面分析了渠坡滑坡的机理。 By analyzing the formation of weak structural plane, the finite element method is used to establish the finite element numerical model. The mechanism analysis of numerical simulation of expansive soil canal slope of deep excavation not only considers the atmosphere affected by the superficial layer, but also considers the factors such as the deep landslide failure of the slope caused by the weak structure of the interface in different soil layers, Soil plastic strain, safety and stability coefficient of these aspects of the slope slope of the mechanism.