考虑土拱效应绕墙顶转动刚性挡墙土压力分布

基于库仑土压力理论,通过研究刚性挡墙绕墙顶转动极限状态土体内主应力拱形状,推导了侧土压力系数和水平微分单元间摩擦系数的理论公式,进而得到改进的主、被动土压力计算公式,并用模型试验结果验证。研究表明:考虑土拱效应计算结果与模型试验结果吻合比较好,墙土摩擦角越大,土拱效应越显著,主动土压力合力作用点越往上移,被动土压力合力作用点越往下移。

Distribution of Earth Pressure of Retaining Wall with Wall Movement of Rotation about Top Considering Soil Arching

Based on coulomb's theory and through the research on the shape of the principal stress arching in limiting state soil behind the rigid retaining wall with the wall movement of rotation about top,the theoretical formula used in the method of the horizontal differential element are presented,including the coefficients of earth pressure and the friction coefficients of the horizontal differential elements,so the improved formula of the rigid retaining wall with the wall movement of rotation about top are obtained,and then are verified with the results of model tests.It shows that the calculating results considering soil arching are in consistence with the results of model tests,and when the outer friction angles on the soil-wall interface become lager,the effect of soil arching becomes more distinct,as a result,the height of acting point of resultant active pressure is higher than before,and the passive pressure is lower than before.