摘要
通过对无限边坡的拟静态平衡分析和考虑饱和黄土在地震作用下动孔隙水压的增长规律,探讨了动孔隙水压对饱和黄土无限边坡地震期间和震后稳定状态的影响。分析表明,地震时孔隙水压累积导致的抗剪强度衰减会导致边坡发生永久变形,甚至导致整体滑动破坏或因黄土液化而发生流滑破坏。引入一个粘聚力界限值来区别黄土边坡的最终破坏模式,以及动孔压比的两个界限值来评价抗剪强度衰减对其破坏机制的影响。最后给出了此类边坡稳定状态的判别图,并建议了分析步骤。
Based on the pseudo-static equilibrium of infinite slope and the earthquake-induced pore water pressure of saturated loess, the effects of earthquake-induced pore water pressure on seismic and post seismic stability of saturated loess slopes were investigated. In loess slopes the shear strength reduction caused by pore water pressure might lead the slope to a permanent deformation, to a slide failure or to a flow failure if liquefaction condition were approached. A threshold value of the cohesion of loess was introduced to distinguish the eventual failure modes, and two threshold values of the earthquake induced pore pressure ratio were given to evaluate the effect of shear strength reduction on the slope failure mechanism. The results were presented in the form of stability charts and a procedure for the evaluation of the seismic stability condition was described.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2005年第9期1016-1020,共5页
Chinese Journal of Geotechnical Engineering
基金
河南省青年骨干教师资助计划项目
河南省教育厅科技攻关项目(2004601068)
关键词
饱和黄土
动孔隙水压
屈服地震系数
动力稳定性
saturated loess
earthquake-induced pore water pressure
yield seismic coefficient
dynamic stability
