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通过以交通荷载为背景的饱和重塑软黏土室内不排水动三轴试验,研究了循环荷载作用下饱和重塑软黏土的累积塑性应变发展形态,可分为3种类型:稳定型、破坏型和临界型。根据稳定型累积塑性应变发展曲线特点,提出了饱和软黏土的稳定累积塑性应变方程,并通过试验结果分析了该方程中各拟合参数与动应力幅值、固结围压和静偏应力的变化规律,同时提出了求解无静偏应力条件下软黏土临界动应力的解析方法。通过动三轴试验结果,提出了含动应力幅值、固结围压、静偏应力和循环周次等影响因素的累积塑性应变拟合模型。
Based on the triaxial test of indoor undrained saturated soft clay with traffic load as background, the cumulative plastic strain development of saturated soft clay under cyclic loading was studied and classified into three types: stable type, And critical type. Based on the characteristics of stable cumulative plastic strain curve, a stable cumulative plastic strain equation of saturated soft clay is proposed. The fitting parameters of dynamic equation, dynamic stress amplitude, consolidation confining pressure and static deviatoric stress Meanwhile, the analytic method for solving the critical dynamic stress of soft clay under no static deviatoric stress is put forward. Based on the results of dynamic triaxial tests, a model of cumulative plastic strain fitted with influencing factors such as dynamic stress amplitude, confining confining pressure, static deviatoric stress and cycle number is proposed.