均布荷载作用下的无黏性土地震被动土压力计算

 针对现有地震被动土压力计算方法的局限性与不足，在平面滑裂面假设下，提出采用拟动力法计算填土表面有均布荷载作用下的地震被动土压力，同时得到被动土压力沿墙高的分布曲线。通过分析墙土摩擦角、填土内摩擦角、水平向和竖向地震加速度系数对被动土压力值及其分布的影响，得出地震被动土压力随墙土摩擦角及填土内摩擦角的增大而增大，随水平向及竖向地震加速度的增大而减小。拟动力法计算得到的地震被动土压力值大于Mononobe-Okabe理论的计算值，且所得的地震被动土压力沿墙高呈非线性分布。

SEISMIC PASSIVE EARTH PRESSURE CALCULATION OF COHSIVELESS SOIL UNDER UNIFORM LOAD

Based on the hypothesis of planar sliding surface，a modified pseudo-dynamic approach is proposed to overcome some shortage in method of seismic passive earth pressure calculation. The formulas are derived for the calculation of lateral earth pressure and total passive force under seismic condition by using pseudo-dynamic approach. The effects of wall friction angle，soil friction angle，horizontal and vertical seismic coefficients on the seismic passive force have been explored. The parametric study shows that the total seismic passive earth pressure increases with the increase in values of wall friction angle and soil friction angle；while it decreases with the increase in values of horizontal and vertical seismic coefficients. The calculation results of seismic passive force obtained from present analysis is larger than those obtained from Mononobe-Okabe theory. Unlike the Mononobe- Okabe theory，the present analysis predicts a nonlinear variation of passive earth pressure along the retaining wall.