刚性挡土墙主动土压力计算方法的改进

Improvement in the calculating method of active earth pressure on rigid retaining walls

采用库仑土压力理论的假设:挡土墙土压力是由墙后填土在极限平衡状态下出现的滑动楔体产生,在该滑动楔体上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、竖向力,建立挡土墙上土压力分布的基本分析方程,结合整个滑楔体的力矩平衡条件,先确定土侧压力系数、再建立土压力分布和土压力合力及作用点高度的理论公式。算例计算值与实测值吻合很好,这表明该方法不仅可行,而且可靠。

On the basis of coulomb's concept that the earth pressure against the back of a retaining wall is due to the thrust exerted by a sliding wedge of soil between the back of the wall and a plane which passes through the bottom edge of the wall and has an inclination of θ,the basic analysis equation are set up by considering the equilibrium of the forces on an thin-layer element of the wedge.By using the equilibrium equation of the moments on the whole wedge,The lateral coefficient of earth pressure,the earth pressure distribution along the wall back,the resultant force of earth pressure and the application point of the resultant force are obtained.Finally,a case study is given to verify the proposed method.The results show that the calculation values are very consistent with the measured values.It is indicated that this calculating method is feasible and reliable.