珠江口海洋原结构软土滞回曲线特征研究

Research on the characteristics of hysteresis curves of marine soft soil with the original structure in Pearl River estuary

采用不同频率循环加载的方式对珠江口海洋原结构软土进行动三轴试验,通过对软土滞回曲线的分析可以了解到土体变形程度、残余塑性变形、刚度和能量耗散能力的变化,结果表明:随着振次的增大,土体刚度和能量耗散能力无明显变化,而变形程度和残余塑性变形减小;随着荷载的增大,变形程度越大,残余塑性变形先增大后减小,刚度和能量耗散能力减小;随着频率的增大,四个参数均减小。

Triaxial tests for the marine soft soil with the original structure in Pearl River estuary on the condition of different frequencies of cyclic loading are carried out to learn the dynamic strain amplitude,residual strain,stiffness and energy dissipation capacity by study the hysteresis curves of the marine soft soil. The test results show that with increasing cycle numbers there is no significant change in stiffness and energy dissipation capacity,but the deformation and residual plastic deformation decrease; with increasing loads,the deformation increases,the residual plastic deformation increases and then decreases,the stiffness and energy dissipation capacity decrease; with increasing frequency,the four parameters all decrease.