{"title":"Evaluating friction angles for clays: piezocone tests versus Atterberg limits","authors":"Z. Ouyang, P. Mayne","doi":"10.1680/jgeen.22.00135","DOIUrl":null,"url":null,"abstract":"A limit plasticity solution for evaluating the effective stress friction angle in clays from piezocone tests was assessed and compared with the popular notion of using laboratory Atterberg limits on remoulded specimens. The results showed that the in-situ piezocone- based method provided a far more accurate and robust interpretation of the friction angle values of 155 separate clays than empirical correlations with plasticity index when compared with laboratory benchmark values obtained from triaxial compression tests. For illustration, the piezocone-based method was shown successfully to capture the effective stress parameter of four clays with friction angles of 20−37°: normally consolidated kaolin clay in chamber tests, natural soft clay deposit located at Bothkennar UK, Troll offshore clay in the North Sea and soft plastic lacustrine deposits in Bogota, Colombia.","PeriodicalId":54572,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering","volume":"692 1","pages":""},"PeriodicalIF":2.0000,"publicationDate":"2023-01-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1680/jgeen.22.00135","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, GEOLOGICAL","Score":null,"Total":0}
引用次数: 0
Abstract
A limit plasticity solution for evaluating the effective stress friction angle in clays from piezocone tests was assessed and compared with the popular notion of using laboratory Atterberg limits on remoulded specimens. The results showed that the in-situ piezocone- based method provided a far more accurate and robust interpretation of the friction angle values of 155 separate clays than empirical correlations with plasticity index when compared with laboratory benchmark values obtained from triaxial compression tests. For illustration, the piezocone-based method was shown successfully to capture the effective stress parameter of four clays with friction angles of 20−37°: normally consolidated kaolin clay in chamber tests, natural soft clay deposit located at Bothkennar UK, Troll offshore clay in the North Sea and soft plastic lacustrine deposits in Bogota, Colombia.
期刊介绍：
Geotechnical Engineering provides a forum for the publication of high quality, topical and relevant technical papers covering all aspects of geotechnical research, design, construction and performance. The journal aims to be of interest to those civil, structural or geotechnical engineering practitioners wishing to develop a greater understanding of the influence of geotechnics on the built environment.
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