中文摘要：

利用天然沉积土在双对数坐标系中良好的双直线特性,对颗粒之间的胶结进行模拟,推导其对应的屈服面、流动准则和硬化准则,在弹塑性力学的理论框架中,建立一种可以与已广泛认可的重塑土本构模型配合使用的胶结模型用于计算模拟天然沉积土.并将计算结果与某地海积软土的三轴试验试验结果进行对比,体现了本模型在结构性软黏土计算上相对于传统本构模型的优越性.

英文摘要：

This paper presents a new concept for structured clays considering its response to be the sum of the strength of the reconstituted soil particle and the cementation bond,and for modelling the two components separately.It is observed that the compression curves under logarithmic coordinates show an inverse S-shape and an obvious consolidation yield stress.The oedometer test data can be well represented by two straight lines under bi-logarithmic coordinates and the consolidation yield stress can be easily obtained.Based on the fold beelines model,a new model within the elastoplastic framework is proposed for the cementation bond.Significant improvements were demonstrated in the performance of the new model over the traditional constitutive models with experimental evidence from the marine soft soil.