水力–力学耦合的超固结非饱和土本构模型的隐式积分算法及其应用  

Implicit integration algorithm of hydro-mechanical constitutive model for overconsolidated unsaturated soils and its application

作　　者：李吴刚 杨庆 LI Wu-gang;YANG Qing(State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology,Dalian 116024,China;School of Environment and Civil Engineering,Jiangnan University,Wuxi 214000,China)

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,辽宁大连116024 [2]江南大学环境与土木工程学院,江苏无锡214000

出　　处：《岩土工程学报》2018年第9期1652-1658,共7页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金重点项目(51639002);国家自然科学基金项目(41572252);辽宁省博士科研启动基金项目(201601055)

摘　　要：超固结非饱和土经常出现于工程实践中,表现出复杂的力学性质。从已有的非饱和土水力–力学耦合的本构模型出发,将超固结的影响加入到了模型中,使模型可以考虑超固结对非饱和土力学性质的影响。超固结非饱和土本构方程的求解是一个复杂的非线性问题,给出了该超固结非饱和土水力–力学耦合模型的隐式积分算法和本构模型的一致切线模量,并对该算法进行验证,证明了该算法的正确性,最后采用该算法对某非饱和土质边坡在地下水位上升的情况下进行有限元分析。The overconsolidated unsaturated soils emerge in many engineering projects. The constitutive models for unsaturated soils are very complicated due to the complex mechanical beahviour of overconsolidated unsaturated soils. A modified constitutive model is given considering the effect of overconsolidation. The constitutive models for the overconsolidated unsaturated soils are used to solve complicated non-linear problems. The implicit integration algorithm of a hydro-mechanical constitutive model for overconsolidated unsaturated soils is given. The consistent tangent modulus is also given. The implicit integration algorithm is validated by the experimental data available in the literatures. The algorithm is applied to the finite element method to analyze an unsaturated soil slope.

关 键 词：非饱和土 超固结 本构模型 隐式积分算法 数值模拟 

分 类 号：TU432[建筑科学—岩土工程]