双对数压缩曲线在海积软土本构中的应用  

Application of Bi-Logarithmic Compression Curves in Modelling of Marine Soft Soil

作　　者：刘鹏[1] 丁文其[2] 

机构地区：[1]南京林业大学土木工程学院,南京210037 [2]同济大学地下建筑与工程系,上海200092

出　　处：《上海交通大学学报》2016年第11期1706-1711,共6页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金(50878149);江苏省高校自然科学基金(15KJB580008)资助项目

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.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.

关 键 词：海积软土 胶结 土结构性 

分 类 号：TU411[建筑科学—岩土工程]