摘要
针对现有挡土墙抗震设计理论存在的不足,采用拟动力法推导并给出了地震作用下挡土墙抗滑稳定安全系数的计算表达式。推导过程中考虑了地震荷载的时间效应和相位差效应,并分析了墙背倾斜角、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抗滑稳定性的影响。参数分析结果表明:挡土墙抗滑稳定性随墙背倾斜角、墙土摩擦角及填土内摩擦角的增大而增大,随水平向地震加速度的增大而减小。拟动力法计算得到的抗滑稳定安全系数小于原有设计理论的计算值。
Aiming at the shortages of seismic design theory for retaining wall, a formula is derived for the computation of the safety factor against sliding by using pseudo-dynamic approach. The time and phase difference due to finite shearing forces and primary wave velocity are considered. The effects of wall inclination, wall friction angle, soil friction angle, and horizontal and vertical seismic coefficients on the safety factor of stability against sliding have been explored in the study. The parametric study shows that the stability against sliding increases with the increase of the values of wall inclination, wall friction angle and soil friction angle; while it decreases with the increase of the values of horizontal seismic coefficients. The calculation results of the safety factor against sliding obtained from present analyses are lower than those obtained from Mononobe-Okabe theory.
出处
《工程力学》
EI
CSCD
北大核心
2012年第7期209-213,共5页
Engineering Mechanics
基金
国家自然科学基金面上项目(50879077)
关键词
地震荷载
拟动力
滑动稳定性
挡土墙
安全系数
seismic loading
pseudo-dynamic
stability against sliding
retaining wall
safety factor
