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以舟山原状海相软土为研究对象,分析循环荷载作用下舟山海相软土动应力、动应变和动孔压随循环荷载次数变化规律以及动强度和动变形特性。试验结果表明:舟山海相软土的动强度随动荷载循环次数的增加而降低;土体动强度指标根据施加动荷载的大小和循环次数而定;应力-应变关系曲线表现为不完全封闭的滞回圈;循环加载下拉、压应变的量级受动应力幅值的影响,土体最后表现为受压破坏;双幅应变随循环次数变化趋势同累计塑性应变发展趋势相同,采用修正的Monismith模型拟合取得比较好的效果。
Taking the Zhoushan undisturbed marine soft soil as the research object, the dynamic stress, dynamic strain and dynamic pore pressure of Zhoushan marine soft soil under cyclic loading are analyzed with cyclic loading frequency variation, dynamic strength and dynamic deformation characteristics. The test results show that the dynamic strength of Zhoushan marine soft soil decreases with the increase of the number of dynamic load cycles. The dynamic strength index of soil is determined by the magnitude of the dynamic load and the number of cycles. The stress-strain curve shows incompletely closed Hysteresis loop. The magnitude of cyclic loading and the magnitude of the compressive strain are affected by the amplitude of the dynamic stress, and the soil finally behaves as the compression failure. The trend of the cyclic variation of the double amplitude is the same as that of the cumulative plastic strain. The modified Monismith model Fitting to obtain better results.