摘要
利用GDS变围压动三轴系统对温州地区典型饱和软黏土进行了一系列循环偏应力和循环围压耦合应力路径下的部分排水循环加载试验,重点分析了部分排水条件下循环偏应力和循环围压耦合效应对正常固结饱和软黏土变形特性的影响。试验结果表明:部分排水条件下,与围压保持恒定,偏应力单独循环剪切相比,循环偏应力和循环围压耦合剪切作用有效地促进了饱和软黏土的累积塑性应变的发展,循环围压和循环偏应力的比值每增加2/3,相应的永久轴向应变就增加32%。进一步根据部分排水条件下饱和软黏土永久轴向应变发展曲线特点,建立了考虑循环偏应力和循环围压耦合效应的正常固结饱和软黏土的永久轴向应变经验公式。
A series of partially drained cyclic triaxial tests under coupling of cyclic deviator and cyclic confining pressure are performed on typical Wenzhou soft clay by using GDS cyclic triaxial apparatus. The coupling effects of cyclic deviator and cyclic confining pressure on the partially drained cumulative plastic strain of saturated clay are studied. The experimental results show that under partially drained condition, compared to that of the conventional CCP tests, coupling of cyclic deviator stress and cyclic confining pressure expedites the accumulation of cumulative plastic strain with the increase of confining pressure amplitude, and the increase of the ratio of cyclic confining pressure to cyclic deviator stress of 2/3 will induce an increment of 32% in the cumulative plastic strain. On the basis of the experimental results obtained, an empirical formula incorporating the coupling effect of cyclic deviator stress and variable confining pressure is proposed to estimate the cumulative plastic strain in the partially drained cyclic tests.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2015年第12期2198-2204,共7页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(51578426
51308420)
关键词
动三轴试验
循环围压
部分排水
永久轴向应变
dynamic triaxial test
cyclic confining pressure
partial drainage
permanent axial strain
