摘要
运用岩石动三轴剪切试验及有限差分数值试验技术,对地震动力作用触发的斜坡崩滑破坏时的坡体力学特征值空间变化规律进行了研究。研究表明:(1)地震动力作用触发的斜坡体崩滑破坏具有显著的"高差"效应,即斜坡体先期崩滑破坏大多起始于坡肩部位;(2)斜坡体临界破坏应变有随坡体微元埋深减小而减小的趋势,临界破坏应变小和坡肩地震峰值加速度的优势放大双重因素导致坡肩部位优先发生先期破坏;(3)斜坡体动态抗剪强度有随坡体微元埋深减小而减小的趋势,临界动态抗剪强度低和坡肩地震峰值加速度的优势放大双重因素导致坡肩部位优先发生先期破坏。
Spatial distribution of slope mechanical parameters on its collapsing and sliding triggered by seismic load is studied by applying rock dynamic triaxial shear test and finite difference numerical simulation.Results show that evident difference in elevation response of slope initial collapsing and sliding triggered by seismic dynamic influence,i.e.initial fracturing always originates in the place of slope shoulder.Secondly,critical failure strain decreases with buried depth decreasing of slope body unit,and double factors that critical failure strain decreasing and peak ground acceleration increasing in slope shoulder result in initial fracturing here.Thirdly,dynamic shear strength decreases with buried depth decreasing of slope body unit,and double factors that dynamic shear strength decreasing and peak ground acceleration increasing in slope shoulder lead to initial fracturing here.The above results contribute to revealing key controlling factors and dynamic process of slope collapsing and sliding triggered by seismic load and providing reference for further relative study.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2010年第4期38-42,67,共6页
Hydrogeology & Engineering Geology
基金
"十一五"国家科技支撑计划项目(2006BAC04B02)
地质灾害防治与地质环境保护国家重点实验室"科技减灾
重建家园"专项科研资助项目(DZKJ-0807)
关键词
斜坡崩滑
高差效应
岩石动三轴剪切试验
有限差分数值试验技术
collapsing and sliding of slopes
difference in elevation response
rock dynamic triaxial shear test
finite difference numerical test