岩土工程学报2013，Vol.35Issue(7)：1297-1306,10.
饱和土非等温固结和不排水剪切的热力学本构模型
Thermodynamic constitutive model for non-isothermal consolidation and undrained shear behaviors of saturated soils
摘要
Abstract
A non-elastic multi-field mechanical model that doesn't require the determination of yield surface and flow rules is established based on the non-equilibrium thermodynamic approach.The concepts of dissipation forces,dissipation flows and granular entropy are introduced for describing the imer-particle movement and the resulting non-elastic energy dissipation by a group of migration coefficients and energy functions.Thus,the constitutive relations of non-elastic deformation are obtained theoretically.The physical process of bound pore water transforming into free water when the temperature rises is taken into consideration for describing the phenomenon of non-isothermal consolidation.The behaviors of non-isothermal consolidation and undrained shear tests at different temperatures for saturated clay with different over-consolidation ratios (OCR) are simulated using this model in order to validate the model.The simulated results show that the non-isothermal consolidation is OCR-dependent and irrevocable under cyclic thermal loading.The undrained shear strength is also influenced by OCR and soil types.关键词
非平衡态热力学/本构模型/非等温固结/不排水剪切/温度效应Key words
non-equilibrium thermodynamics/ constitutive model/ non-isothermal consolidation/ undrained shear/ thermal effect分类
建筑与水利引用本文复制引用
张志超,程晓辉..饱和土非等温固结和不排水剪切的热力学本构模型[J].岩土工程学报,2013,35(7):1297-1306,10.基金项目
清华大学—剑桥大学—MIT低碳能源大学联盟(LCEUA)种子基金项目(2010LC002) （LCEUA）
