岩土工程学报2011，Vol.33Issue(5)：754-761,8.
考虑气相压力变化和偏应力影响的非饱和土本构模型
New model for unsaturated soils considering variation of gas pressure and shear stress
摘要
Abstract
Based on the constitutive framework of unsaturated soils established by the continuum porous medium soil mechanics, an elastoplastic model for unsaturated soils in triaxial stress state is formulated.According to the work expression of unsaturated soils, three stress variables are needed in describing the model: generalized effective stress, modified suction and gas pressure.The gas effect is considered and the constitutive equation considering solid-liquid-gas effect is developed.In the solid phase, a non-associated flow flue is adopted.The plastic change of the degree of saturation and gas strain, representing the influence of the historical evolution of liquid and gas effect respectively, are incorporated in the hardening equations.The soil water characteristic curve is introduced as the liquid constitutive equation, in which the plastic volumetric strain is incorporated to reflect the influence caused by skeleton deformation.Based on the Boyle law and the Henry law, a gas constitutive equation which is affected by the solid and liquid phases is derived.Model predictions are compared with the existing test data, showing that the model agree well with the test data.Comparisons between the model and the one without gas effect are also given.关键词
非饱和土/本构方程/气相影响Key words
unsaturated soils/ constitutive equation/ gas effect分类
建筑与水利引用本文复制引用
刘艳,赵成刚,蔡国庆,李舰..考虑气相压力变化和偏应力影响的非饱和土本构模型[J].岩土工程学报,2011,33(5):754-761,8.基金项目
国家自然科学基金项目(51078019) （51078019）
国家重点基础研究发展计划基金项目(2010CB732100) （2010CB732100）
北京市自然科学基金项目(8112024) （8112024）
