摘要
在不排水的条件下,黄土在单调荷载下会出现软化,在循环荷载下会出现液化(或循环移动)。对此给出了试验结果,并尝试用边界面及广义塑性模型来预测黄土的软化及液化现象。结果表明:循环荷载下塑性应变累积速度要比单调荷载下软化阶段塑性应变累积速度慢,广义塑性模型可较好地预测黄土软化、液化现象。讨论并分析了模型参数对预测结果的影响。
Under undrained conditions, the phenomena of strain softening occur when the loess taken from northern France is subjected to monotonic loading, while liquefaction or cyclic mobility phenomenon is observed under cyclic loading. The bounding surface model and the generalized plasticity model are used to predict this behaviour. It is shown that the accumulated rate of plastic strain under cyclic loading is slower than that in softening region under monotonic loading. The sensitivity of model parameters is discussed; and it is concluded that both the bounding surface model and the generalized plasticity model can describe the loess liquefaction satisfactorily, provided that appropriate parameters are defined.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2005年第23期4272-4281,共10页
Chinese Journal of Rock Mechanics and Engineering
关键词
土力学
黄土
循环荷载
边界面模型
广义塑性模型
液化
软化
soil mechanics
loess
cyclic loading
bounding surface model
generalized plasticity model
liquefaction
softening
