结构性超固结土的统一硬化模型  

UNIFIED HARDENING MODEL FOR STRUCTURALLY OVER-CONSOLIDATED CLAYS

作　　者：侯伟[1] 姚仰平[1] 牛雷[1] 

机构地区：[1]北京航空航天大学交通科学与工程学院,北京100191

出　　处：《工业建筑》2008年第8期14-16,58,共4页Industrial Construction

基　　金：国家自然科学基金资助项目(10672010);国家基础研究计划资助项目(2007CB714203)

摘　　要：统一硬化超固结土模型是在下加载面和剑桥模型理论框架下,提出的能够描述超固结土的剪缩、剪胀、硬化和软化特性的简单、实用的模型。它通过将与土的结构性有关的参数引入到超固结土模型中,来建立结构性超固结土模型。与剑桥模型相比,它只增加了2个材料参数,即伏斯列夫面的斜率Mh和结构性参数α。采用新模型对结构性超固结土的应力-应变关系进行预测的结果表明:所建立的结构性超固结土模型基本能够描述结构性超固结土的特性。Based on the subloading yield surface and the Cam-clay model, the proposed unified hardening model is used to describe the characteristics for over-consolidated clay with structure, including strain hardening, strain softening and stress dilatancy. The constitutive model for over-consolidated clays with structure is proposed introducing the parameter related to the structure of clays and requires two additional parameters, which are the slope of the Hvorslev envelope and the structure parameter. The predicted results of structurally over-consolidated clays show that the proposed model can rationally describe the basic properties for structurally over-consolidated clays.

关 键 词：结构性 超固结土 统一硬化模型 统一硬化参数 

分 类 号：TU432[建筑科学—岩土工程] TU431[建筑科学—土工工程]