饱和土非等温固结和不排水剪切的热力学本构模型

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 English Version

清华大学土木工程系，北京 100084

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）

详细信息

作者简介:
张志超(1985- )，男，福建莆田人，博士研究生，主要从事岩土体多物理场本构模型研究。E-mail: zhangzhichaopt@163.com。

中图分类号: TU43
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出版历程
- 收稿日期: 2012-09-26
- 发布日期: 2013-07-16

Thermodynamic constitutive model for non-isothermal consolidation and undrained shear behaviors of saturated soils

Department of Civil Engineering, Tsinghua University, Beijing 100084, China

摘要

摘要: 基于非平衡态热力学理论，建立了一种无需屈服面、流动法则等概念的非弹性多物理场力学模型。该模型引入耗散力、耗散流及颗粒熵概念，将土体颗粒层次的耗散机制及其引发的宏观能量耗散统一地描述为一组迁移系数和能量函数模型，从而得到非弹性变形的本构关系。考虑了温升时孔隙内原本无法自由流动的结合水向自由水转化并激发相应能量耗散的过程，以描述饱和土体的非等温固结行为。应用该模型对不同超固结比（OCR）饱和黏性土的非等温固结及温度对不排水剪切的影响进行了模拟并和实测数据进行对比，验证了模型的有效性。模拟结果表明：饱和土体的非等温固结行为与OCR值密切相关，且具有不可逆特性，在循环温度荷载作用下将产生变形累积；而温度对饱和土体不排水剪切强度的影响则依赖于土体类型及OCR值等因素。
- 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
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 inter-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.
- non-equilibrium thermodynamics /
- constitutive model /
- non-isothermal consolidation /
- undrained shear /
- thermal effect

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[1]

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饱和土非等温固结和不排水剪切的热力学本构模型 English Version

作者简介: 张志超(1985- )，男，福建莆田人，博士研究生，主要从事岩土体多物理场本构模型研究。E-mail: zhangzhichaopt@163.com。

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出版历程

Thermodynamic constitutive model for non-isothermal consolidation and undrained shear behaviors of saturated soils

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出版历程

目录

作者简介:
张志超(1985- )，男，福建莆田人，博士研究生，主要从事岩土体多物理场本构模型研究。E-mail: zhangzhichaopt@163.com。