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利用GDS动三轴系统对温州地区典型饱和软黏土进行一系列恒定围压和变围压不排水循环加载试验,重点分析循环偏应力和循环围压耦合作用对超固结饱和软黏土不排水循环累积变形特性的影响。试验结果表明:不排水条件下,与围压保持恒定,偏应力单独循环剪切相比,循环围压的存在,一定程度上限制了超固结饱和软黏土永久轴向应变的发展。在平均主应力–广义偏应力(p-q)空间,循环偏应力和循环围压耦合应力路径斜率p/q每增加1,永久轴向应变将降低约20.18%。进一步在试验基础上提出考虑超固结比和循环围压影响的永久轴向应变经验公式。
A series of tests on constant saturated pressure and variable confining pressure undrained cyclic loading of typical saturated soft clay in Wenzhou area were carried out by GDS dynamic three-axis system. The coupling between cyclic deviatoric stress and cyclic confining pressure was applied to analyze the undrained circulation of overconsolidated saturated soft clay Effect of cumulative deformation characteristics. The experimental results show that under undrained conditions, the existence of cyclic confining pressure limits the development of permanent axial strain of overconsolidated saturated soft clay to a certain extent, compared with that under constant confining pressure and eccentric stress. In the average principal stress-generalized deviatoric stress (p-q) space, the permanent axial strain will decrease by about 20.18% for each increment of the slope p / q of cyclic stress and cyclic confining pressure coupled stress path. Based on the experiment, the empirical formula of permanent axial strain considering the effects of overconsolidation ratio and circulating confining pressure is proposed.