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为评价地震液化时饱和砂土初始液化后变形,研究了有效围压和密度对饱和砂土液化后单调加载应力应变的影响。基于初始液化后加载试验结果,改进了模拟饱和砂土液化后单调加载的本构方程,考虑了围压和密度的影响,并给出了门槛剪切应变随围压变化的关系式。结果表明:密度的影响可以由临界应力状态线的斜率的变化来体现;有效围压变化的影响可以由门槛剪切应变的变化来反映。
In order to evaluate the deformation of saturated sands after liquefaction, the effect of effective confining pressure and density on the monotonic loading stress-strain of saturated sands after liquefaction was studied. Based on the initial liquefaction load test results, the constitutive equation of monotonic loading after simulating saturated sand liquefaction was improved, the influence of confining pressure and density was considered, and the relationship between the threshold shear stress and confining pressure was given. The results show that the influence of density can be expressed by the change of the slope of critical stress state line. The influence of effective confining pressure can be reflected by the change of threshold shear strain.