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针对经典土压力理论的不足之处,采用有限单元法对作用于刚性挡墙上的主动土压力进行数值分析,土体采用弹塑性的Mohr-Coulomb本构模型,在土与墙体结构接触面间引入接触单元,并按库仑摩擦准则定义接触关系,研究了刚性挡墙上主动土压力的大小、作用点位置及其分布规律,并对填土性质参数进行了敏感性分析。结果表明,刚性挡墙后主动土压力为凸曲线分布,作用点位置处于O.36~O.40倍墙高处;填土模量的增大将提高土压力数值,但在同时又引起作用点位置的下降;填土重度与土压力数值呈正相关,但对作用点位置的影响却较小;墙土间摩擦系数无论是对土压力大小还是作用点的位置都有较大的影响。
In view of the deficiency of the classical theory of earth pressure, the finite element method is used to analyze the active earth pressure acting on the rigid retaining wall. The soil is elasto-plastic Mohr-Coulomb constitutive model, The contact elements were introduced and the contact relationship was defined according to the Coulomb friction criterion. The size of active earth pressure on the rigid retaining wall, the location of action points and their distribution were studied. Sensitivity analysis of filling parameters was carried out. The results show that the active earth pressure behind the rigid retaining wall is convex curve, and the action point is located at the height of O.36 ~ 0.40 times the wall height. Increasing the fill modulus will increase the earth pressure value, but at the same time, And the position of soil filling decreases with the increase of soil pressure. The weight of soil filling is positively correlated with the value of soil pressure, but it has a little influence on the location of action point. The friction coefficient between wall and soil has a great influence on the position of soil pressure and point of action.