摘要
基于超固结土的UH模型,结合渐近状态概念,将适用于饱和砂土的渐近状态本构模型推广为考虑渐近状态特性的超固结土本构模型,用于描述土的超固结性和渐近状态特性。通过采用变换应力方法实现了模型的三维化。新提出的本构模型简单、参数较少,与剑桥模型相比,仅增加了一个材料参数,即伏斯列夫面斜率。该模型能够合理反映超固结土的硬化、软化、临界状态、剪缩、剪胀、应力路径依赖性、渐近状态等特性。
Based on UH model for overconsolidated （OC） clays and the concept of asymptotic state, an asymptotic state constitutive model for saturated sand is developed to be an asymptotic state constitutive model for overconsolidated clays to describe the overconsolidated and asymptotic state behaviors of clays. The proposed model can be applied conveniently to three-dimensional stress states by using transformed stress method. Compared with Cam-clay model, the proposed model is simple, and it only requires one additional soil parameter which is the slope of the Hvorslev envelope. The model can model many characteristics of clays well, including strain hardening and softening, critical state, stress dilatancy, path dependency, and asymptotic state behaviour.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2010年第3期683-688,694,共7页
Rock and Soil Mechanics
基金
国家自然科学基金资助项目(No50879001
No10872016
No90715035)
关键词
渐近状态
超固结土
本构模型
三维
asymptotic state
overconsolidated clays
constitutive model
three-dimension
作者简介
罗汀，女，1957年生，博士，副教授，主要从事土的基本特性和本构模型研究。E—mail：tluo@buaa．edu．cn
