A volumetric yield surface for compacted soils based on constant water content testing

C. Jayasundara, J. Kodikara, A. N. Zhou

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

1 Citation (Scopus)


Unsaturated soils exhibit various complex behaviours compared to saturated soils, such as collapse upon wetting. Therefore, understanding the response of unsaturated soils under general field conditions is essential for the design and construction of safe and economical geotechnical engineering structures. This research is based on the Monash-Peradeniya-Kodikara (MPK) framework proposed by Kodikara [1] for unsaturated compacted soils, which provides a direct link to the traditional compaction loaded curves and constant water content loading experiments. Kodikara [1] named the loaded compaction surface the loading wetting state boundary surface (LWSBS) and validated the model for a combination of loading and wetting stress paths. However, the experimental validation of the yield surface after drying stress paths was not addressed in the original paper. This paper reports the results of drying stress path tests carried out within the specific volume (v),specific moisture ratio (vw) and mean net stress (p) space of the MPK model, and observations suggest that the yield surface is unique after drying stress paths. Mathematical equations for the volumetric behaviour of unsaturated soils are derived using the constant degree of saturation hyperlines derived from constant water content testing, as this enables direct coupling with the soil water retention curve. Finally, the volumetric equations are validated based on the available experimental data.

Original languageEnglish
Title of host publication7th International Symposium on Deformation Characteristics of Geomaterials, IS-Glasgow 2019
EditorsErdin Ibraim, Alessandro Tarantino
PublisherEDP Sciences
ISBN (Electronic)9782759890644
Publication statusPublished - 25 Jun 2019
EventInternational Symposium on Deformation Characteristics of Geomaterials 2019 - Glasgow, United Kingdom
Duration: 26 Jun 201928 Jun 2019
Conference number: 7th

Publication series

NameE3S Web of Conferences
ISSN (Print)2555-0403
ISSN (Electronic)2267-1242


ConferenceInternational Symposium on Deformation Characteristics of Geomaterials 2019
Abbreviated titleIS-Glasgow 2019
Country/TerritoryUnited Kingdom

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