非饱和土的清华弹塑性模型  

Tsinghua elastoplastic model for unsaturated soils

作　　者：李广信[1] 司韦[1] 张其光[1] 

机构地区：[1]水沙科学与水利水电工程国家重点实验室

出　　处：《岩土力学》2008年第8期2033-2036,2062,共5页Rock and Soil Mechanics

基　　金：国家自然科学基金委员会、二滩水电开发有限公司雅砻江水电开发联合研究基金项目(No.50639060);清华大学基础研究基金(JC2007005)

摘　　要：为研究土在非饱和增湿情况下的应力、应变和强度关系,提出将含水率引入清华模型的硬化参数中建立非饱和土的清华弹塑性模型。通过在干土中掺加冰屑的方法进行增湿试验,表明该模型可以预测不同含水率的非饱和土的应力-变形和强度关系,从天然风干状态增湿到其他含水率的应力-应变全过程的计算结果也与试验结果相符合。将含水率直接引入弹塑性模型而不去研究复杂的基质吸力,可能是非饱和土本构模型工程应用的一条简便途径。In order to investigate the relationship among stress,strain and strength of soil under unsaturated moistening,water content is introduced into the hardening parameter of Tsinghua model to develop the Tsinghua elastoplastic model of unsaturated soil.On the basis of moistening tests by means of mixing ice crumblings into dry soil,it is shown in the test results that this model is capable to predict the relationship among stress,deformation and the strength of unsaturated soil under different water contents.The results of model calculations well agree with the test results of soil moistened from the air-dry state to other unsaturated states corresponding to various water contents.With water content directly introduced into the elastoplastic model instead of the complicated matrix suction,it might be showing a handy and explicit way to the engineering application of unsaturated soil constitutive models.

关 键 词：含水率 弹塑性模型 非饱和土 增湿 基质吸力 

分 类 号：TU43[建筑科学—岩土工程]