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通过DDS-70动三轴实验仪器,对珠江口海洋土进行一系列不排水分级循环加载实验。重点分析了不同超固结比的海洋土在不同频率下的动弹性模量、阻尼比、骨干曲线和残余应变的变化规律。实验结果表明,不排水条件下,随着频率和超固结比的增大,动弹性模量增大,变形程度减小,阻尼比减小,残余应变减小。但整体来看,超固结比对阻尼比影响不大。
Through the DDS-70 moving three-axis experimental apparatus, a series of non-drainage graded cyclic loading experiments were carried out on the marine soil in the Pearl River Estuary. The changing rules of dynamic elastic modulus, damping ratio, skeleton curve and residual strain of marine clay with different overconsolidation ratios at different frequencies are mainly analyzed. The experimental results show that under undrained conditions, with the increase of frequency and overconsolidation ratio, the dynamic elastic modulus increases, the deformation decreases, the damping ratio decreases, and the residual strain decreases. However, on the whole, overconsolidation has little effect on the damping ratio.