【摘要】 地震土压力的评价是土力学和岩土工程领域的基本研究课题之一。以往的研究结果表明,挡墙的位移量和位移模式对于地震土压力大小和分布具有显著影响。实际工程中,地震荷载下挡土墙后填土通常处于主动和被动状态之间。经典的物部-冈部公式只能计算主动和被动极限状态下的地震土压力,未考虑填土的侧向变形对于土压力的影响。文中基于拟静力法和曲面中间滑楔体的概念,给出了挡墙平动模式时,任意侧向变形条件下的被动侧地震土压力计算方法。在此基础上采用所提方法对一典型的挡土墙系统的被动侧地震土压力进行了计算,给出了地震土压力系数的计算图表,并与基于平面滑动面假定的计算结果进行了对比,讨论了平面滑动面所导致的误差。更多还原

【Abstract】 The evaluation of seismic earth pressure is one of the key subjects in soil mechanics and geotechnical engineering.Previous studies indicate that the mode and amount of wall displacement has a significant effect on the magnitude and distribution of earth pressure.In engineering practice,the seismic earth pressure may fall anywhere between active and passive pressures.Classic Mononobe-Okabe solutions can only give solutions for seismic earth pressures at the active and passive states.In this paper,based on the concept of pseudo-static analysis and the intermediate soil wedge with curved surface,a new methodology is developed to evaluate seismic earth pressures at the passive side under any boundary strain constraint for a rigid retaining structure with translational movement.On the basis,the seismic earth pressure of a typical retaining wall system is calculated by the proposed method,and a chart for the seismic earth pressure coefficients is provided.In addition,a comparison is made between the results got by the proposed method and those obtained based on the planar surface assumption.更多还原