有限元强度折减法在膨胀土堑坡滑坍分析中的应用

由于膨胀土路堑边坡滑坍机理复杂，用传统分析方法难以作出合理的分析和解释．有限元强度折减法采用土的非线性弹塑性本构模型，考虑膨胀力的作用，通过对坡体的应力、应变分析计算，可获得其变形过程和潜在滑面，还能采用安全系数来评价边坡的稳定性．为此，在合理考虑边坡土体强度参数取值的基础上，以面力方式引入膨胀力，尝试用有限元强度折减法和Ansys软件，分析了广西南宁-友谊关高速公路膨胀土堑坡滑坍规律，所得结果令人满意．

Strength reduction method with FEM for analyzing the expansive soil cutting slope collapse and slide

The mechanism of landslide of expansive soil cutting slope is complex, so the traditional slope analysis method is unable to obtain the reasonable analysis and explanation. The shear strength reduction method with FEM is adopted by using the nonlinear and elastoplasticity model of soil,take the effect of the expansibility is taken into account, when the stress and strain of slope body are calculated ,which can lead to obtain the distortion process and the latent sliding plane, and the safety factor is adopted to evaluate the slope stability. Therefore, on the base of reasonable consideration of expansive soil intensive parameter value, an expansibility is introduced by the mode of pressure, the rule of Nanyou road expansive soil landslide is analyzed by shear strength reduction method with FEM and the software of Ansvs.the result of which is satisfying.