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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。
Using the GDS variable confining pressure triaxial system, a series of cyclical deviatoric stress and cyclic confining pressure coupled stress paths under a coupled drainage stress test were performed on a typical saturated soft clay in Wenzhou area, and the partial deviatoric stress and circulation under partial drainage conditions were analyzed. Influence of confining pressure coupling effect on deformation characteristics of normally consolidated saturated soft clays . The experimental results show that: under partial drainage conditions, compared with the constant confining pressure and the deviatoric stress alone, the deviatoric stress and the cyclic confining pressure coupling shear effectively promote the development of the cumulative plastic strain of saturated soft clay. For each 2/3 increase in the ratio of confining pressure and cyclic deviator stress, the corresponding permanent axial strain increases by 32%. Based on the characteristics of the permanent axial strain development curve of saturated soft clay under partial drainage conditions, an empirical formula for the permanent axial strain of normally consolidated saturated soft clay considering cyclic deviator stress and cyclic confining pressure coupling effect was established.