{"title":"A Simplified Settlement Prediction Method for Piled Rafts in Clay","authors":"Priyanka Bhartiya, D. Basu, T. Chakraborty","doi":"10.1680/jgeen.21.00207","DOIUrl":null,"url":null,"abstract":"A method for estimation of nonlinear, time-dependent settlement of piled raft foundations (PRFs) embedded in saturated clayey soils subjected to uniformly distributed load under the single drainage condition is developed. Twenty different rectangular PRFs resting on four different types of normally consolidated to moderately overconsolidated clays (Overconsolidation ratio, OCR = 1, 2, and 5) are analyzed to quantify their short- and long-term settlements. Rigorous three-dimensional, elasto-plastic finite element (FE) analyses are performed with the critical state-based Modified Cam Clay (MCC) soil constitutive model. The coupled consolidation theory of Biot is used to model the time-dependent dissipation of excess pore pressure under the single drainage condition. The FE analysis results are used to systematically investigate the influence of time and various soil and PRF parameters on the settlement response of piled rafts. Based on the study, fitted equations are developed correlating PRF settlements and degree of consolidation with various influencing parameters. The proposed equations can predict with reasonable accuracy the immediate and primary consolidation settlement as well as the degree of consolidation, and can be used at the initial design stages.","PeriodicalId":54572,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Geotechnical Engineering","volume":"2014 1","pages":""},"PeriodicalIF":2.0000,"publicationDate":"2022-03-17","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.21.00207","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 method for estimation of nonlinear, time-dependent settlement of piled raft foundations (PRFs) embedded in saturated clayey soils subjected to uniformly distributed load under the single drainage condition is developed. Twenty different rectangular PRFs resting on four different types of normally consolidated to moderately overconsolidated clays (Overconsolidation ratio, OCR = 1, 2, and 5) are analyzed to quantify their short- and long-term settlements. Rigorous three-dimensional, elasto-plastic finite element (FE) analyses are performed with the critical state-based Modified Cam Clay (MCC) soil constitutive model. The coupled consolidation theory of Biot is used to model the time-dependent dissipation of excess pore pressure under the single drainage condition. The FE analysis results are used to systematically investigate the influence of time and various soil and PRF parameters on the settlement response of piled rafts. Based on the study, fitted equations are developed correlating PRF settlements and degree of consolidation with various influencing parameters. The proposed equations can predict with reasonable accuracy the immediate and primary consolidation settlement as well as the degree of consolidation, and can be used at the initial design stages.
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.