Estimating equivalent elastic properties of frozen clay soils using an XFEM-based computational homogenization

IF 3.8 2区工程技术 Q1 ENGINEERING, CIVIL

Cold Regions Science and Technology Pub Date : 2024-08-14 DOI:10.1016/j.coldregions.2024.104292

Emad Norouzi, Biao Li, R. Emre Erkmen

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引用次数: 0

Abstract

This study addresses the challenge of estimating the elastic properties of heterogeneous frozen clay soils by introducing a comprehensive approach that combines analytical and numerical models. The frozen clay soil is treated as a mixture composed of frozen clay-water composites and nonclay mineral inclusions. An inversion algorithm is employed to deduce the elastic properties of the matrix (clay-water composites) of two artificially frozen sandy clay samples with known temperature-dependent elastic properties. Subsequently, a two-dimensional numerical simulation using the eXtended Finite Element Method (XFEM) is conducted to carry out numerical homogenization by considering the imperfect bond among frozen clay-water composites and nonclay minerals. The numerical homogenization model offers insights into the temperature-dependent behavior of the interface stiffness parameter. The numerical homogenization results are compared with conventional numerical homogenization approaches like the FEM, which rigidly defines the bonding between inclusions and the matrix. The comparison indicates that the neglect of imperfect bonds among clay-water composites and nonclay minerals will lead to unrealistic outcomes in cases with a high fraction of inclusions. This integrated approach advances the understanding and prediction of elastic properties of frozen clay soils by considering their heterogeneous nature.

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利用基于 XFEM 的计算均质化估算冻土的等效弹性特性

本研究通过引入一种结合分析和数值模型的综合方法，解决了估算异质冻土弹性特性的难题。冻土被视为由冻土-水复合材料和非粘土矿物包裹体组成的混合物。采用反演算法推导出两个人工冻结砂质粘土样本基体（粘土-水复合材料）的弹性特性，这些样本的弹性特性已知与温度有关。随后，使用扩展有限元法（XFEM）进行了二维数值模拟，通过考虑冷冻粘土-水复合材料和非粘土矿物之间的不完全结合，实现了数值均质化。数值均质化模型有助于深入了解界面刚度参数随温度变化的行为。数值均质化结果与传统的数值均质化方法（如有限元）进行了比较，后者严格定义了夹杂物与基体之间的结合。比较结果表明，忽略粘土-水复合材料和非粘土矿物之间的不完全结合将导致在夹杂物比例较高的情况下产生不切实际的结果。这种综合方法考虑到了冻土的异质性，从而推进了对冻土弹性特性的理解和预测。

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

Cold Regions Science and Technology 工程技术-地球科学综合

CiteScore

7.40

自引率

12.20%

发文量

209

审稿时长

4.9 months

期刊介绍： Cold Regions Science and Technology is an international journal dealing with the science and technical problems of cold environments in both the polar regions and more temperate locations. It includes fundamental aspects of cryospheric sciences which have applications for cold regions problems as well as engineering topics which relate to the cryosphere. Emphasis is given to applied science with broad coverage of the physical and mechanical aspects of ice (including glaciers and sea ice), snow and snow avalanches, ice-water systems, ice-bonded soils and permafrost. Relevant aspects of Earth science, materials science, offshore and river ice engineering are also of primary interest. These include icing of ships and structures as well as trafficability in cold environments. Technological advances for cold regions in research, development, and engineering practice are relevant to the journal. Theoretical papers must include a detailed discussion of the potential application of the theory to address cold regions problems. The journal serves a wide range of specialists, providing a medium for interdisciplinary communication and a convenient source of reference.