摘要
针对地铁荷载作用下饱和软粘土地基出现的长期沉降问题提出了一个采用拟静力有限元计算和经验拟合计算模型相结合的预测方法,易于在工程中应用。将沉降分为不排水循环荷载作用下土体中的累积变形引起的沉降和由于动荷载引起的累积孔压消散产生的固结沉降,这两部分沉降的计算选用较为合理的基于临界状态理论的经验拟合公式,土中应力分量的计算采用有限元方法计算并从中提取,最后采用分层总和法计算迭加得到总沉降,实例的计算结果得到了较好的验证。
The aim of this paper is to analyze long-term settlement of saturated soft clay foundation under subway loading and a predicting method is proposed by combining two-dimension finite element calculating method and empirical simulation formula. The settlement can be divided into two parts, that is, deformation caused by cumulative plastic strain under undrained cyclic loading and reconsolidation deformation caused by dissipation of cumulative pore pressure. Then the settlement is calculated using empiric formula based on critical state and the stress of soft clay can be gained from FEM calculation. The total deformation can be gained from layered summation method. Finally, the result of an example is in good agreement with the fact.
出处
《地下空间与工程学报》
CSCD
2006年第5期813-817,共5页
Chinese Journal of Underground Space and Engineering
基金
国家自然科学基金项目(10272083)
教育部新世纪优秀人才支持计划项目(NCET-04-0371)
上海市曙光计划项目(02SG17)
教育部高等学校博士点基金项目(2003247005)
关键词
循环荷载
长期沉降
经验拟合
塑性累积变形
累积孔压
有限元计算
cyclic loading
long-term settlement
experiential simulation
cumulative plastic strain
cumulative pore pressure
finite element calculating
作者简介
刘明（1978-），女，江苏淮安人，在读博士生，主要从事岩土工程本构理论研究工作。E-mail：emilytj@126．com
