Dilatancy behavior of marine coral sand–fines mixture in the South China Sea: critical thresholds and particle breakage effects

IF 6.5 1区工程技术 Q1 ENGINEERING, GEOLOGICAL

Acta Geotechnica Pub Date : 2026-02-20 DOI:10.1007/s11440-026-02950-6

Xue Li, Xiaoyue Li, Jiyun Nan, Taishan Lu

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引用次数: 0

Abstract

Exactly understanding the dilatancy of marine coral sand containing fines is critical for ensuring the safety of ocean infrastructures. This paper presents key findings coupled with an exhaustive discussion and elaboration through experimentally investigating dilatancy of marine coral sand. Test results indicate that both the modified Cam-clay model and Rowe’s dilatancy equation have limitations in accurately describing the dilatancy behavior of clean coral sand and its mixtures. The fines content and its corresponding threshold can determine the critical void ratio, thereby influencing dilatant or contractive behavior. Relationship between dilatancy ratio and equivalent void ratio (\(e^{*}\)) suggests that using the variation in \(e^{*}\) at phase-transition state to describe dilatancy is practical. Besides, a logarithmic correlation is observed between dilatancy ratio and stress ratio at peak state. Nevertheless, dilatancy ratio shows a negative linear relation with stress ratio at critical state. For the above-mentioned descriptions, a semi-empirical dilatancy equation accounting for particle breakage in marine coral sand was proposed and found to be reasonable after verification with previous test results.

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南海海相珊瑚砂粉混合物的剪胀行为：临界阈值和颗粒破碎效应

准确了解含细粒海洋珊瑚砂的扩容性，对于确保海洋基础设施的安全至关重要。本文通过实验研究海洋珊瑚砂的扩容性，提出了关键的发现，并进行了详尽的讨论和阐述。试验结果表明，修正的Cam-clay模型和Rowe剪胀方程在准确描述清洁珊瑚砂及其混合物的剪胀行为方面存在局限性。细粒含量及其对应的阈值可以决定临界空隙比，从而影响膨胀或收缩行为。剪胀比与等效空隙比（\(e^{*}\)）的关系表明，用\(e^{*}\)在相变状态下的变化来描述剪胀是可行的。在峰值状态下，剪胀比与应力比呈对数相关。但在临界状态下，剪胀比与应力比呈负线性关系。针对上述描述，提出了考虑海洋珊瑚砂颗粒破碎的半经验剪胀方程，并与前人试验结果进行了验证，发现该方程是合理的。

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

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.