摘要
采用一个一维非线性流变本构模型,对饱和软粘土进行了一维非线性流变——固结耦合计算。这种非线性流变分析方法不同于“等时间线的概念”,是通过应力历史对次压缩指数大小的影响来考虑流变的非线性。这个方法可以更加方便和准确的描述超固结土的流变特性。通过编写的有限差分程序,从非线性流变的角度计算分析了土样厚度、应力历史、排水距离对一维压缩试验主固结阶段内次压缩特性以及实验曲线的影响。计算结果表明,对于超固结土,固结阶段内的非线性流变特性要更加明显;采用非线性流变模型能够更好的模拟Imai等(1992)采用特殊压缩试验得到的“屈服点现象”。
A new nonlinear creep model for clay is developed and used to study the one dimensional creep-consolidation process. The nonlinear creep analysis method is based on the relationship between stress history and secondary consolidation index. It is different from the ＂equivalent time＂, concept and can give a better prediction of creep rate for over-consolidated clay. The effects of sample height, stress history, and distance from drainage surface on one dimensional secondary compression behavior during primary consolidation period are investigated by a finite difference method using the proposed model. Analysis results show that nonlinear creep behavior during primary consolidation period is more apparent for over-consolidated soil and the nonlinear analysis method can give a good simulation of the ＂yield point＂ obtained by Imai et al （1992） in their special compression tests.
出处
《工程力学》
EI
CSCD
北大核心
2006年第8期116-121,101,共7页
Engineering Mechanics
基金
上海市重点学科建设项目资助(沪教委科[2001]44号)
关键词
次压缩
流变
固结
本构模型
次压缩指数
secondary compression
creep
consolidation
constitutive model
secondary compression index
