摘要
在上海地区典型饱和软粘土不排水循环三轴试验的基础上,分析了影响软粘土塑性累积变形的主要因素:循环荷载的作用次数,初始静偏应力和循环加载动偏应力。基于临界状态土力学理论,引入了相对偏应力水平参数,考虑初始静应力、循环动应力和不排水极限强度的相互影响,研究了不同静、循环动应力组合应力历史影响下饱和软粘土的不排水循环累积变形特性。
A series of undrained cyclic triaxial tests were performed on a typical Shanghai soft clay, Both the initial static deviatoric stress and the cyclic stress level were analyzed varied. It was shown that the cumulative plastic strain depended not only on the applied cyclic stress and number of cycles, but also on the initial static deviatoric stress level. Based on the concept of critical state soil mechanics, a new parameter called relative deviatoric stress level was introduced considering the effects of initial static deviatoric stress, cyclic deviatoric stress and undrained deviatoric stress at failure. The cumulative plastic strain was found to be closely related to this parameter..
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2006年第7期891-895,共5页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金资助项目(10272083)
上海市曙光计划项目(02SG17)
教育部高等学校博士点基金资助项目(20030247005)
关键词
循环荷载
塑性累积变形
初始静偏应力
动偏应力
相对偏应力水平
cyclic loading
cumulative plastic strain
initial static deviator stress
cyclic shear stress
relative deviator stress level
