湖相软土流变模型识别及其工程应用分析

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。

Identification on rheological model of lacustrine soft soil and its engineering application

The triaxial rheological tests are carried out on Suzhou lacustrine soft soil;according to the results of test,S-6,K-B and K-S rheological models are used to describe the rheological characteristics of the soil.In the inversion of model parameters,it is found that the fitting accuracy of initial deformation by S-6 model is not enough;and the fitting accuracy of medium-term deformation by K-B model is not enough;the fitting results of K-S model are the best.Therefore,K-S model is used to study the rheological properties of Suzhou lacustrine soft soil.In order to determine the parameters of model better,the concept of stress ratio is introduced in the practical application of the model,and it is found that,there are exponential relationship between stress ratio and model parameters;based on this,we can select the model parameters according to different engineering stress conditions.At last,the model is used for the settlement calculation of practical engineering;the results show that K-S model has high fitting precision,and it can be used to guide the region’s project construction.