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滨海软黏土在波浪循环荷载作用下会发生强度弱化,从而降低软黏土地基承载力,影响结构稳定性。以烟台港原状淤泥质粉质黏土为研究对象,通过室内动三轴试验,以围压、初始静偏应力、循环动应力和循环次数为试验变量,分析不同应力组合作用下的淤泥质粉质黏土的孔压发展规律和不排水抗剪强度弱化规律。根据孔压发展规律拟合出软黏土双曲孔压计算模型,同时利用等效超固结比理论,将得到的孔压模型和强度规律结合起来,提出了综合考虑围压、静偏应力、动应力和循环次数适用于整个动态循环过程的不排水抗剪强度弱化公式,并通过试验对公式进行了验证。最后将公式应用于烟台港防波堤数值模型的动力计算中。从试验到数模,比较完整地提出了一套便于应用于工程实践的考虑地基土体循环弱化效应的动力计算方法。
The coastal soft clay will weaken under the cyclic loading of wave, which will reduce the bearing capacity of soft clay foundation and affect the structural stability. Taking the silt-silty clay in Yantai Port as the research object, the indoor dynamic triaxial test was used to test the confining pressure, the initial static deviatoric stress, the cyclic dynamic stress and the number of cycles as the experimental variables. The effects of different stress combinations on the silty silty clay The development of clay pore pressure and the law of undrained shear strength weakening. According to the development of pore pressure, the calculation model of hyperbolic pore pressure of soft clay is fitted. At the same time, by using the equivalent excess consolidation ratio theory, the pore pressure model obtained is combined with the strength law, and the comprehensive consideration of confining pressure, The dynamic stress and the number of cycles are suitable for the undrained shear strength weakening formula of the whole dynamic cycle, and the formula is validated through experiments. Finally, the formula is applied to the dynamic calculation of the numerical model of the breakwater in Yantai Port. From the experiment to the numerical model, a set of dynamic calculation method which is easy to be applied in engineering practice to consider the cyclic weakening effect of the foundation soil is put forward.