Estimation of coefficient of earth pressure at rest for coral sand considering the effect of density and stress

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL Acta Geotechnica Pub Date : 2024-04-15 DOI:10.1007/s11440-024-02325-9
Jiru Zhang, Weike Peng, Xiaoxuan Liu, Mingxing Luo
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Abstract

The coefficient of earth pressure at rest (K0) is a crucial parameter in geotechnical design. In this study, coral sands with various initial relative densities were subjected to K0 consolidation tests and consolidated-drained triaxial compression tests to investigate the impact of the relative density, stress level, and particle breakage on K0. Based on the Mohr–Coulomb failure law and experimental data, a formula for estimating K0 related to the effective stress and effective friction angle was proposed. The results revealed that the K0 of coral sand decreased with an increase in effective stresses, while the impact of the initial relative density on K0 was more obvious. At the same effective stress, the smaller the initial relative density was, the larger the K0 can be. In the tested stress range, minimal particle breakage was observed during the K0 consolidation, whereas a greater degree of particle breakage occurred during triaxial shear. This particle breakage has the potential to undermine the stress-dilatancy and interparticle locking characteristics in coral sands, leading to a diminished effective friction angle and potentially affecting K0. The proposed formula for estimating K0 can be expressed as a function of the effective stresses and effective friction angle, and the effect of initial relative density on K0 can be reflected by the function parameters. This formula provides a reasonable estimate of the K0 value for coral sand within a certain range of relative densities and stress levels. Furthermore, it demonstrates favorable applicability to other types of granular soils, such as quartz sand and rockfills.

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考虑密度和应力的影响,估算珊瑚砂静止时的土压力系数
静止时的土压力系数(K0)是岩土工程设计中的一个重要参数。本研究对不同初始相对密度的珊瑚砂进行了 K0 固结试验和固结排水三轴压缩试验,以研究相对密度、应力水平和颗粒破碎对 K0 的影响。根据莫尔-库仑失效定律和实验数据,提出了与有效应力和有效摩擦角相关的 K0 估算公式。结果表明,珊瑚砂的 K0 随有效应力的增加而减小,而初始相对密度对 K0 的影响更为明显。在相同的有效应力下,初始相对密度越小,K0 越大。在测试的应力范围内,K0固结过程中观察到的颗粒断裂极少,而在三轴剪切过程中发生的颗粒断裂程度更大。这种颗粒断裂可能会破坏珊瑚砂的应力膨胀和颗粒间锁定特性,导致有效摩擦角减小,并可能影响 K0。拟议的 K0 估算公式可表示为有效应力和有效摩擦角的函数,初始相对密度对 K0 的影响可通过函数参数反映出来。该公式可在一定的相对密度和应力水平范围内合理估算珊瑚砂的 K0 值。此外,它还证明了对其他类型颗粒土(如石英砂和岩石填料)的良好适用性。
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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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