考虑土拱效应的倾斜挡墙土压力研究

针对现有主要研究竖直挡墙间土压力，而缺少研究倾斜挡墙间土压力的现状，研究了具有一定倾斜角度的挡墙土压力。通过假定挡墙与水平面呈夹角α，对挡墙间土体沿竖向取水平薄层作为微分单元体，通过作用在单元体上的水平力和竖向力的平衡条件，得到考虑土拱效应及倾斜角度的挡墙土压力理论公式，及对应不同倾斜角度和摩擦角的系数Kw计算公式，并与Handy理论土压力公式进行了比较分析。结果表明：当墙体竖直时，本文公式与Handy理论公式得到的结果一致。倾斜角度越小，竖向应力值越小，而挡墙上土压力值则越大，土拱效应发挥效果越好；Kw随着摩擦角的增大而增大，随内摩擦角的增大而减小。Kw与K′之间的差值随着内摩擦角、摩擦角的增大而增大，随倾斜角度的增大则减小，当墙体非竖直时，采用侧压力系数K′计算挡墙上土压力值存在风险。

Research on earth pressure against inclined walls considering soil arching

Most of the past researches lie on the earth pressure with vertical walls， and there lacks study on inclined retaining walls. In this study，earth pressure with inclined retaining walls was studied.A horizontal plane between the inclined walls was taken to be the analytical element，the theoretical formula of the earth pressure considering effect of the inclination of the retaining walls and soil arching was obtained based on the equilibrium of the horizontal and vertical forces on the analytical element.The results show that the results obtained from this study agrees well with Handy’s result when the retaining walls are vertical.The lateral earth pressure on the inclined retaining walls increases，the average vertical stress decreases with the decrease of the inclination angle.The coefficient of earth pressure Kw decreases with an increase in internal friction angle，a decrease in friction angle.The difference between Kw and K′ increases with the increase of friction angle and internal friction angle，decreases with the increase of the inclined angle.The results reveal that it is danger to use K′ to calculate the earth pressure on the inclined retaining walls.