刚性挡土墙地震主动土压力的拟动力学分析  

Pseudo-dynamic analysis for seismic active earth pressure behind rigid retaining wall

作　　者：王志凯[1] 夏唐代[1] 陈炜昀[1] 

机构地区：[1]浙江大学岩土工程研究所软弱土与环境土工教育部重点实验室,浙江杭州310058

出　　处：《浙江大学学报（工学版）》2012年第1期46-51,共6页Journal of Zhejiang University：Engineering Science

摘　　要：采用拟动力学方法的基本假定,考虑地震加速度的放大效应,利用水平层分析法,求得在地震荷载作用下随地震时间变化的主动土压力强度的分布解.将最危险滑动面倾角和合力作用点高度与传统方法进行比较,分析合力作用点时程曲线的特征,探讨水平加速度系数及加速度放大系数对土压力分布的影响.结果表明:采用该方法计算得到的滑动面倾角和合力作用点高度大于传统方法计算值;合力作用点高度在地震时是不断变化的;水平地震加速度系数及加速度放大系数均对土压力分布有很大影响,不考虑加速度的放大效应是偏于危险的.The effect of amplification of seismic accelerations was considered and a level-layer analysis method was suggested in order to obtain the theoretical formula for the distribution of active earth pressure under seismic loads based on the basic hypothesis of pseudo-dynamic method.The inclination of the most dangerous slip surface and the location of resultant force were compared with those of the traditional method.The effects of horizontal seismic acceleration coefficient and amplification factor on the distribution of seismic active earth pressure were analyzed.Results show that the values of the inclination of the most dangerous slip surface and the location of resultant force are larger than those obtained by the traditional methods.The location of resultant force is always changing during the earthquake.The horizontal seismic acceleration coefficient and the amplification factor significantly impact on the distribution of seismic active earth pressure,so it is dangerous to ignore the effect of amplification of seismic accelerations.

关 键 词：拟动力学方法 地震主动土压力 放大效应 时程特征 

分 类 号：TU476.4[建筑科学—结构工程]