不同位移模式刚性挡墙主动土压力研究

Active earth pressure for rigid retaining walls with different displacement modes

假定挡墙后填土沿墙高任一点处侧压力与其水平位移成线性关系,将土体看作是一系列弹簧和理想刚塑体的组合体。在此基础上,分析了挡墙位移模式,改进了Coulomb理论,提出了不同位移模式下刚性挡墙主动土压力非线性分布计算方法。该方法计算合力大小和Coulomb理论计算相等,主动土压力分布和合力作用点位置随挡墙位移模式变化而不同,计算结果和实测结果吻合较好。该方法对刚性挡墙土压力计算具有理论价值。

The hypothesis is presented that there is a linear relationship between the lateral pressure and its horizontal displacement along a rigid retaining wall, and the soil mass is treated as the combination of a set of springs and ideal rigid plasticity objects. Through the analysis of displacement models of the retaining wall and the improvement of Coulomb＇s theory, the calculation method of active earth pressure for rigid retaining walls under different displacement modes is proposed. The resultant forces of the active earth pressure by the present method are equal to those of Coulomb＇s theory. The distribution of the active pressure is nonlinear, and the points of the resultant forces of active earth pressure are variable in a certain range. The calculated results are in agreement with the experimental ones. So the present method is of theoretical value for studying the active earth pressure on rigid retaining walls.