Coupled hydro-mechanical hypoplastic model for partially saturated soils under monotonic and cyclic loading

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
M. Pico, D. Mašín, W. Fuentes
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引用次数: 0

Abstract

Numerous geotechnical applications are significantly influenced by changes of moisture conditions, such as energy geostructures, nuclear waste disposal storage, embankments, landslides, and pavements. Additionally, the escalating impacts of climate change have started to amplify the influence of severe seasonal variations on the performance of foundations. These scenarios induce thermo-hydro-mechanical loads in the soil that can also vary in a cyclic manner. Robust constitutive numerical models are essential to analyze such behaviors. This article proposes an extended hypoplastic constitutive model capable of predicting the behavior of partially saturated fine-grained soils under monotonic and cyclic loading. The proposed model was developed through a hierarchical procedure that integrates existing features for accounting large strain behavior, asymptotic states, and small strain stiffness effects, and considers the dependency of strain accumulation rate on the number of cycles. To achieve this, the earlier formulation by Wong and Mašín (CG 61:355–369, 2014) was enhanced with the Improvement of the intergranular strain (ISI) concept proposed by Duque et al. (AG 15:3593–3604, 2020), extended with a new modification to predict the increase in soil stiffness with suction under cyclic loading. Furthermore, the water retention curve was modified with a new formulation proposed by Svoboda et al. (AG 18:3193–3211, 2023), which reproduces the nonlinear dependency of the degree of saturation on suction. The model’s capabilities were examined using experimental results on a completely decomposed tuff subjected to monotonic and cyclic loading under different saturation ranges. The comparison between experimental measurements and numerical predictions suggests that the model reasonably captures the monotonic and cyclic behavior of fine-grained soil under partially saturated conditions. Some limitations of the extended model are as well remarked.

Abstract Image

单调荷载和循环荷载下部分饱和土壤的水力机械耦合低塑性模型
许多岩土工程应用都会受到湿度条件变化的严重影响,例如能源土工结构、核废料处置库、堤坝、滑坡和路面。此外,气候变化的影响日益加剧,已开始扩大严重季节变化对地基性能的影响。这些情况会在土壤中产生热-水-机械荷载,这些荷载也会以周期性的方式变化。稳健的构成数值模型对分析此类行为至关重要。本文提出了一种扩展的低塑性构造模型,能够预测部分饱和细粒土在单调和循环荷载下的行为。所提出的模型是通过一个分层程序开发的,该程序整合了现有的大应变行为、渐近状态和小应变刚度效应等特征,并考虑了应变累积率与循环次数的关系。为此,Wong 和 Mašín(CG 61:355-369,2014 年)采用 Duque 等人(AG 15:3593-3604,2020 年)提出的粒间应变(ISI)概念进行了改进,并进行了新的扩展,以预测循环加载下土壤刚度随吸力的增加而增加。此外,Svoboda 等人(AG 18:3193-3211,2023 年)提出的新公式对保水曲线进行了修改,再现了饱和度对吸力的非线性依赖关系。在不同饱和度范围内,对完全分解的凝灰岩进行单调和循环加载的实验结果检验了该模型的能力。实验测量结果与数值预测结果的对比表明,该模型合理地捕捉到了细粒土在部分饱和条件下的单调和循环行为。同时也指出了扩展模型的一些局限性。
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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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