平移模式下挡土墙墙背土侧压力系数的计算

Computation of Coefficient of Lateral Earth Pressure on Retaining Wall Surface with Mode of Translation

根据库仑土压力理论中墙背滑动楔体整体达到静平衡的基本原理,假定沿墙高方向,土与墙背的摩擦角均达到极限值,从墙背处土体主应力偏转的应力状态分析出发,得到墙背处的主应力偏转角和土侧压力系数的计算公式;把土侧压力系数用于水平层分析法,建立了竖向土压力的基本方程,求解该方程,导出了挡土墙主动土压力、土压力合力及其作用位置的理论公式。经比较,该方法与其他方法对土侧压力系数的计算结果基本一致,所得的挡土墙主动土压力计算结果与模型试验结果也较为吻合。

Based on the principal principle that sliding wedge completely existed in static equilibrium state and all friction angles between soil and wall were assumed to get limit value, by analyzing the principal stress deflection of soil on wall surface, the formulas for calculating principal stress deflection angle and coefficient of lateral earth pressure were obtained. Using the coefficient in the method of horizontal differential element, the governing equation of vertical earth pressure was established. The theoretical formulas of the unit active earth pressure, the earth pressure resultant and the point of application of earth pressure resultant on retaining wall were obtained by solving the governing equation. By comparing the calculation results of the presented formula with other methods, it is shown that the calculating values of coefficient of lateral earth pressure agree with those of other methods, and the calculating values of unit active earth pressure also agree well with those of the model experimental results.