Sidhu Ramulu Duddu, Vamsi Kommanamanchi, Hariprasad Chennarapu, U. Balunaini
{"title":"Evaluating improved moduli of geogrid-stabilised sandy soil with a deflectometer","authors":"Sidhu Ramulu Duddu, Vamsi Kommanamanchi, Hariprasad Chennarapu, U. Balunaini","doi":"10.1680/jgrim.22.00075","DOIUrl":null,"url":null,"abstract":"Geogrid-stabilised soil has been widely adopted to enhance performance in transportation and infrastructure sectors. In a study, the performance of unstabilised and triaxial-geogrid-stabilised sandy soils in terms of dynamic deformation modulus and elastic modulus was measured using lightweight deflectometer test and plate load tests respectively. The objective of the study was to evaluate: (a) determination of dynamic deformation modulus of sandy soils with different relative compactions from deflectometer testing and compare with the elastic modulus of sandy soils from plate load tests for a given relative compaction of 97%; (b) determination of modulus improvement factors of triaxial-geogrid-stabilised sandy soils through extensive laboratory testing; and (c) demonstration of compaction quality control of well-graded gravel using deflectometer testing through a field study. The triaxial-geogrid-stabilised sandy soil layer showed modulus improvement factors of 1.51 and 1.37 obtained from deflectometer and plate tests corresponding to an embedded depth of 50 mm respectively. The percentage differences in these values are in the range of 4% to 9% for all the embedded depths. Hence a lightweight deflectometer can be used instead of a plate load test as a quick and low-cost alternative for determining the modulus improvement factor of geogrid-stabilised sand soil, both in the laboratory and in the field.","PeriodicalId":51705,"journal":{"name":"Proceedings of the Institution of Civil Engineers-Ground Improvement","volume":"14 1","pages":""},"PeriodicalIF":1.3000,"publicationDate":"2023-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of the Institution of Civil Engineers-Ground Improvement","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1680/jgrim.22.00075","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, GEOLOGICAL","Score":null,"Total":0}
引用次数: 0
Abstract
Geogrid-stabilised soil has been widely adopted to enhance performance in transportation and infrastructure sectors. In a study, the performance of unstabilised and triaxial-geogrid-stabilised sandy soils in terms of dynamic deformation modulus and elastic modulus was measured using lightweight deflectometer test and plate load tests respectively. The objective of the study was to evaluate: (a) determination of dynamic deformation modulus of sandy soils with different relative compactions from deflectometer testing and compare with the elastic modulus of sandy soils from plate load tests for a given relative compaction of 97%; (b) determination of modulus improvement factors of triaxial-geogrid-stabilised sandy soils through extensive laboratory testing; and (c) demonstration of compaction quality control of well-graded gravel using deflectometer testing through a field study. The triaxial-geogrid-stabilised sandy soil layer showed modulus improvement factors of 1.51 and 1.37 obtained from deflectometer and plate tests corresponding to an embedded depth of 50 mm respectively. The percentage differences in these values are in the range of 4% to 9% for all the embedded depths. Hence a lightweight deflectometer can be used instead of a plate load test as a quick and low-cost alternative for determining the modulus improvement factor of geogrid-stabilised sand soil, both in the laboratory and in the field.
期刊介绍:
Ground Improvement provides a fast-track vehicle for the dissemination of news in technological developments, feasibility studies and innovative engineering applications for all aspects of ground improvement, ground reinforcement and grouting. The journal publishes high-quality, practical papers relevant to engineers, specialist contractors and academics involved in the development, design, construction, monitoring and quality control aspects of ground improvement. It covers a wide range of civil and environmental engineering applications, including analytical advances, performance evaluations, pilot and model studies, instrumented case-histories and innovative applications of existing technology.