摘要
以凝灰岩类土质边坡为研究对象,采用数值模拟计算方法对边坡的地震动力响应进行了分析,讨论了泊松比、阻尼比参数取值变化对边坡动力响应的影响。结果表明:地震作用下,水平加速度在凝灰岩类土质边坡中的分布具有明显的折减效应,且随高度衰减;边坡稳定系数随地震时程波动变化,在某个瞬时会小于1.0,但一般不会造成边坡的整体失稳破坏;基于Newmark滑块分析原理的滑体永久位移只在平均加速度大于屈服加速度时才会产生,与持时无关;泊松比、阻尼比的取值变化不会改变坡体的加速度分布规律,但滑体永久位移会随泊松比的增大而增大,随阻尼比的增大而减小。
Taking tuff soil-like slope as the research object,the seismic dynamic response of the slope was analyzed by numerical simulation,and then the influence of Poisson's ratio and damping ratio thereon was discussed.The results show that:under the action of earthquake,the distribution of horizontal acceleration in tuff soil-like slope presents an obvious reduction effect,and decays with the height;the factor of stability fluctuates with seismic time history,and may be less than 1.0 at some instant,but generally overall slope failure will not be caused;the permanent displacement of the sliding mass based on Newmark sliding block analysis only occurs when average acceleration is greater than yield acceleration,and is independent of the duration;the value variation of Poisson's ratio and damping ratio does not change the distribution law of slope acceleration,however,the permanent displacement of sliding mass will increase with the increment of Poisson's ratio and decrease with the increment of damping ratio.
作者
唐世雄
刘鑫
姬广强
张策
TANG Shixiong;LIU Xin;JI Guangqiang;ZHANG Ce(CCCC Consultants Co.,Ltd.,Beijing 100010,China)
出处
《路基工程》
2021年第1期145-150,共6页
Subgrade Engineering
关键词
凝灰岩类土质边坡
动力响应
折减效应
屈服加速度
永久位移
泊松比
阻尼比
tuff soil-like slope
dynamic response
reduction effect
yield acceleration
permanent displacement
Poisson’s ratio
damping ratio
