Jiru Zhang, Weike Peng, Xiaoxuan Liu, Mingxing Luo
{"title":"Estimation of coefficient of earth pressure at rest for coral sand considering the effect of density and stress","authors":"Jiru Zhang, Weike Peng, Xiaoxuan Liu, Mingxing Luo","doi":"10.1007/s11440-024-02325-9","DOIUrl":null,"url":null,"abstract":"<p>The coefficient of earth pressure at rest (<i>K</i><sub>0</sub>) is a crucial parameter in geotechnical design. In this study, coral sands with various initial relative densities were subjected to <i>K</i><sub>0</sub> consolidation tests and consolidated-drained triaxial compression tests to investigate the impact of the relative density, stress level, and particle breakage on <i>K</i><sub>0</sub>. Based on the Mohr–Coulomb failure law and experimental data, a formula for estimating <i>K</i><sub>0</sub> related to the effective stress and effective friction angle was proposed. The results revealed that the <i>K</i><sub>0</sub> of coral sand decreased with an increase in effective stresses, while the impact of the initial relative density on <i>K</i><sub>0</sub> was more obvious. At the same effective stress, the smaller the initial relative density was, the larger the <i>K</i><sub>0</sub> can be. In the tested stress range, minimal particle breakage was observed during the <i>K</i><sub>0</sub> 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 <i>K</i><sub>0</sub>. The proposed formula for estimating <i>K</i><sub>0</sub> can be expressed as a function of the effective stresses and effective friction angle, and the effect of initial relative density on <i>K</i><sub>0</sub> can be reflected by the function parameters. This formula provides a reasonable estimate of the <i>K</i><sub>0</sub> 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.</p>","PeriodicalId":49308,"journal":{"name":"Acta Geotechnica","volume":null,"pages":null},"PeriodicalIF":5.6000,"publicationDate":"2024-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Acta Geotechnica","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1007/s11440-024-02325-9","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, GEOLOGICAL","Score":null,"Total":0}
引用次数: 0
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.
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.