平移模式下刚性挡土墙三维被动土压力分布研究

针对实际工程中挡土结构物长高比较小时,挡土墙被动土压力分布具有明显的三维空间效应,采用二维被动土压力的计算方法研究挡土墙上被动土压力的分布不合理,研究了平移模式下刚性挡土墙上三维被动土压力分布情况。首先建立无粘性土体中有限宽深比刚性挡土墙有限单元分析模型,在平移模式下,当墙后土体到达极限状态时,研究挡土墙水平被动土压力的分布规律。结果表明,挡土墙水平被动土压力沿挡土墙宽度方向和深度方向均为非线性分布;挡土墙宽深比不会对三维被动土压力的分布方式、分布值大小及分布值的增长趋势产生影响;内摩擦角和墙土接触面摩擦角比值会对三维被动土压力的分布方式、分布值大小及分布值的增长趋势产生影响。研究成果可为工程设计和三维被动土压力理论计算提供数值依据。

Research on 3D Passive Earth Pressure Distribution of Rigid Retaining Wall in Translational Mode

For the case that the width and depth ratios of retaining wall is relatively small in actual projects, there is obvious three-dimensional effect of passive earth pressure distribution on the retaining wall. It is unreasonable to study the distribution of passive earth pressure on the retaining wall by using two-dimensional passive earth pressure calculation method, and three-dimensional passive earth pressure distribution on rigid retaining wall was studied in translation mode. First of all, finite element analysis of finite width-to-depth ratios rigid retaining wall was established in non-cohesive soil. The soil behind wall reached the limit state in translation, the distribution of horizontal passive earth pressure on the retaining wall was studied. The results show that the horizontal passive earth pressure is nonlinear along the width and depth direction on the retaining wall; The distribution form, the distribution values and its growth trend of three-dimensional passive earth pressure are not affected by the ratios of width to depth of the retaining wall; But it is affected by the values of soil internal friction angle and the soil-to-wall interface friction ratios. The research results can provide numerical basis for engineering design and theoretical calculation of three-dimensional passive earth pressure.