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对苏州湖相软土进行了三轴流变试验,根据试验结果拟采用S-6、K-B、K-S 3个流变模型来描述土体的流变特征,在模型参数反演中发现,S-6模型对加载初期变形的拟合精度不够,K-B模型对加载中期变形的拟合精度不够,而K-S模型能够很好地描述苏州湖相软土的流变特征。在模型的实际应用中引入应力比的概念,发现应力比与模型参数成指数关系,以此可以根据不同的工程应力条件来选择模型参数,最后,将该模型用于实际工程的沉降计算,通过与实测数据的对比显示模型的拟合精度较高,可以用于指导该地区的工程建设。
According to the test results, three rheological models of S-6, KB and KS are proposed to describe the rheological characteristics of soils. In the inversion of model parameters, it is found that S- 6 model is not enough to fit the initial deformation of the load, the fitting accuracy of the KB model to the mid-loading deformation is not enough, and the KS model can well describe the rheological characteristics of the Suzhou lacustrine soft soil. In the practical application of the model, the concept of stress ratio is introduced and the stress ratio is found to be exponential with the model parameters. Therefore, the model parameters can be selected according to different engineering stress conditions. Finally, the model is used to calculate the settlement of the actual project. The comparison with the measured data shows that the fitting accuracy of the model is high and can be used to guide the project construction in this area.