Modelling the evolutionary stiffness of granular bentonite mixtures

IF 5.7 1区工程技术 Q1 ENGINEERING, GEOLOGICAL Acta Geotechnica Pub Date : 2025-02-25 DOI:10.1007/s11440-025-02561-7

Vicente Navarro, Erik Tengblad, Rubén López-Vizcaíno, Joel Torres-Serra, Laura Asensio

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Abstract

The multimodal and evolutive pore size distribution of granular bentonite mixtures makes it advisable to adopt a triple porosity approach for the macroscopic modelling of their hydromechanical behaviour under different water content conditions. These models must integrate the evolutive effect of compressibility of the megapores between the bentonite grains on the overall stiffness of the mixture. This work proposes a strategy for this integration which, while assuming a constant compressibility of the megaporosity, allows an evolutionary expression for the overall stiffness of the mixture to be obtained. To evaluate the scope of this proposal, the hydration of two mixtures with very different initial packing is analysed. Both analyses start from dry conditions (89 MPa suction) and end in full saturation. Therefore, their analysis requires modelling the behaviour of the granular bentonite mixture for the whole range of structural organisation it can have. It is therefore a very demanding qualification exercise in which, despite the simplicity of the proposed formulation, very satisfactory results have been obtained.

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颗粒状膨润土混合料的演化刚度模拟

颗粒状膨润土混合料的多模态和演化的孔隙尺寸分布，使得采用三重孔隙度方法对其在不同含水量条件下的流体力学行为进行宏观模拟是可取的。这些模型必须综合考虑膨润土颗粒间大孔隙的压缩性对混合物整体刚度的演化影响。这项工作提出了一个策略，这一整合，而假设一个恒定的压缩率的大孔隙，允许一个进化表达式的整体刚度的混合物，以获得。为了评估这一建议的范围，分析了两种初始填料非常不同的混合物的水化作用。这两种分析都是从干燥状态（89兆帕吸力）开始，到完全饱和状态结束。因此，他们的分析需要对颗粒状膨润土混合物的整个结构组织范围的行为进行建模。因此，这是一项要求非常严格的资格审查工作，尽管拟议的提法很简单，但已经取得了非常令人满意的结果。

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来源期刊

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.