Thermo-Hydro-Mechanical Coupling Model for Layered Saturated Clays Considering Thermal Contraction under Impeded Boundary

IF 3.6 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-07-25 DOI:10.1002/nag.70018

Yucheng Lu, Yi Tian, Lun Hua, Wenlian Liu, Yue Gui, Wenbing Wu, Lei Zhang

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引用次数: 0

Abstract

This paper proposes a constitutive relationship to describe the thermal contraction behavior of saturated normally-consolidated clays. With this constitutive relationship, a thermo-hydro-mechanical (THM) coupling model considering the thermal contraction is established for the layered saturated clays subjected to a ramp thermo-mechanical load, and the corresponding semi-analytical solution is derived under an impeded boundary by using Laplace transform method. The correctness and suitability of the proposed model is then validated by comparing with the existing models. Based on this theoretical model, the parametric analyses shows that the soil close to the bottom exhibits expansive deformation in the early stage of consolidation, and the expansive deformation gradually shifts to settlement with time. As the thermal load and/or heating rate increase, the expansion zone in the soil is extended in space, and the expansive deformation becomes pronounced. The permeability of boundaries has a significant impact on the evolution of EPWP and settlement during the thermal consolidation. The outcomes will provide a more general theoretical model for the THM coupling problems in thermal-related geotechnical engineering and a more comprehensive understanding on the THM coupling characteristics of saturated clays.

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考虑阻碍边界下热收缩的层状饱和粘土热-水-力耦合模型

本文提出了一种描述饱和正常固结粘土热收缩特性的本构关系。基于这一本构关系，建立了考虑热收缩的层状饱和黏土热-水-力耦合模型，并利用拉普拉斯变换方法推导了层状饱和黏土在障碍边界下的半解析解。通过与现有模型的比较，验证了所提模型的正确性和适用性。基于该理论模型的参数分析表明，靠近底部的土体在固结初期表现为膨胀变形，随着时间的推移，膨胀变形逐渐向沉降转变。随着热负荷和升温速率的增大，土体中的膨胀区在空间上扩展，膨胀变形明显。边界渗透率对热固结过程中EPWP的演化和沉降有重要影响。研究结果将为热相关岩土工程中THM耦合问题提供更通用的理论模型，并对饱和粘土THM耦合特性有更全面的认识。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal for Numerical and Analytical Methods in Geomechanics 工程技术-材料科学：综合

CiteScore

6.40

自引率

12.50%

发文量

160

审稿时长

9 months

期刊介绍： The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.