地震与海啸作用下重力式岸墙旋转位移拟静力分析
Quasi-static Analysis of Rotational Displacement in a Gravity Retaining Wall During Earthquakes and Tsunamis

被动状态下位移预测是挡墙地震工程设计中的关键,而岸墙后回填土的孔隙水压力对墙体运动具有一定影响。采用拟静力法计算墙后部分浸水土体的被动动土压力,根据静力水压力理论近似计算土颗粒里的动水压力;同时考虑地震荷载和海啸力的作用,根据力矩极限平衡确定旋转门槛加速度系数,采用旋转块体方法计算岸墙被动旋转运动下的地震位移。探讨回填砂土内摩擦角、墙体与土间摩擦角、地震加速度系数、回填土地下水位、海啸波浪高度等参数对旋转位移的影响。
The prediction of seismic rotational displacements in retaining walls under passive conditions is an important design aspect in earthquake-prone regions. In this study, a rotating block method was developed to calculate the rotational displacements of quay walls based on rigid foundations under seismic loading, and tsunami forces for the passive earth pressure condition. The proposed method considered the combined effects of seismic forces, hydrostatic, and hydrodynamic pressures and tsunami forces acting on the quay wall. The tsunami force was considered to be an additional force acting on the upstream face of the wall, and was calculated using a simple formula. Variations of different parameters involved in the analysis suggested the sensitiveness of the rotational displacements against the rotational slider of failure of the wall, which will provide a better guideline for design.