滨海软土非线性流变模型及其工程应用研究

基于室内一维固结蠕变试验，研究了天津滨海淤泥质软黏土的蠕变变形规律，建立了反映滨海软黏土的非线性流变本构模型，确定了模型中的各个参数。通过此本构模型推导出天津软黏土的沉降计算公式，利用该公式对天津滨海地区北塘水库大坝软土堤基进行了沉降计算和分析，计算值与实测值比较吻合，证明了流变模型的合理性，同时也说明在软土地基沉降计算中，考虑非线性流变性状的影响是必要的。并对天津滨海新区软土长期蠕变沉降作出预测。

A nonlinear rheological model of soft clay and its application to Tianjin littoral area

Based on one-dimensional consolidation-creep laboratory test, the creep deformation of muddy soft clay in Tianjin littoral area is performed. A nonlinear rheological model is established; and the model coefficients are determined considering the characteristics of littoral soft clay. Furthermore, a settlement equation is deduced from the rheological model and applied to the settlement calculation of the soft soil under Beitang reservoir’s dam in Tianjin littoral area. Numerical results agree well with those of field measurement, which provides convincing evidences for model’s excellent solution quality and fidelity, and shows the necessity of considering the soft clay’s nonlinear rheological characteristics in settlement analysis. Finally, a pre-estimation on long-term creep settlement of the soft clay in Tianjin Binhai New Aera is presented.