Modeling the Swelling Behavior of Clayey Geomaterials Across Scales: Advances and Challenges

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2024-10-30 DOI:10.1002/nag.3881
Hamza Mhamdi Alaoui, Chaofa Zhao, Wenbo Niu, Pierre‐Yves Hicher
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Abstract

Most soils and rocks contain varying fractions of clay minerals within their solid matrix. These geomaterials can exhibit a significant swelling potential toward chemo‐thermo‐hydromechanical loadings. Several multiscale modeling techniques have been developed to ascertain their swelling behavior across various scales, with molecular dynamics (MD), micromechanics‐based approaches, and double‐porosity models being the most common. MD simulation is a computational technique that applies Newton's second law of motion to depict the movement of particles within a granular system. Micromechanics‐based approaches upscale the poro‐elasticity law from the clay layer level to the sample scale through homogenization. Dual‐porosity models are generally based on elasto‐plasticity, incorporating different hydro‐mechanical laws at two distinct scales. These models have been extensively used, particularly for clayey soils and bentonites, though their application to clayey rocks has not been reported in the literature. Although their significant contribution to the understanding of clay swelling behavior, these techniques have been insufficiently reviewed, compared, and discussed mutually in the literature. This paper aims to provide a cross‐look on these multiscale approaches by presenting the theoretical background of existing formulations, highlighting breakthrough results, discussing major differences and current challenges, and proposing future perspectives.
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粘土质土工材料跨尺度膨胀行为建模:进展与挑战
大多数土壤和岩石的固体基质中都含有不同比例的粘土矿物。这些土工材料在面对化学热液力学载荷时会表现出明显的膨胀潜力。目前已开发出几种多尺度建模技术来确定它们在不同尺度上的膨胀行为,其中最常见的是分子动力学(MD)、基于微观力学的方法和双孔隙模型。分子动力学模拟是一种计算技术,它应用牛顿第二运动定律来描述颗粒系统中颗粒的运动。基于微观力学的方法通过均质化将孔弹性定律从粘土层放大到样品尺度。双孔隙模型一般以弹塑性为基础,在两个不同尺度上采用不同的水力学定律。这些模型已被广泛应用,特别是在粘性土壤和膨润土中,但在粘性岩石中的应用还未见文献报道。尽管这些技术对理解粘土膨胀行为做出了重大贡献,但文献中对它们的回顾、比较和相互讨论还不够充分。本文旨在通过介绍现有配方的理论背景、强调突破性成果、讨论主要差异和当前挑战以及提出未来展望,对这些多尺度方法进行交叉研究。
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来源期刊
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.
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