Variability of soil stress-strain non-linearity for use in MSD analyses evaluated using databases of triaxial tests on fine-grained soils

M. E. W. Beesley*, P. J. Vardanega

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Abstract

The feasibility of a tunnel, foundation or excavation project is to some extent dependent on limiting the potential ground movements during construction. To make such an assessment it is important to quantify the stress-path dependent behaviour of the soil undergoing undrained lateral and vertical stress relief. At an early stage in the project, site-specific test data is limited and so predictions must necessarily be based upon expected characteristics of the soil deposit. Analysis of a recently compiled database RFG/TXCU-278 has demonstrated a method of quantifying the variability of stress-strain data from stress-path tests that are more frequently encountered in commercial practice (consolidated-undrained triaxial compression and extension tests) for use in design sensitivity analyses. A soil non-linearity parameter (b) is investigated using the database RFG/TXCU-278 and a series of previously reported tests performed on intact Bothkennar Clay. Evidence from both databases suggests that the variability of b is not strongly linked to the effects of shear mode, OCR, strain rate, or plasticity. It is shown that reasonable predictions of nonlinear behaviour up to a load factor (σmob/σfailure) of 0.8 can be achieved using the MSD-MSF method for a rigid pad test.
Original languageEnglish
Title of host publicationGeotechnical Aspects of Underground Construction in Soft Ground
Subtitle of host publicationProceedings of the Tenth International Symposium on Geotecnical Aspects of Underground Construction in Soft Ground, IS-Cambridge 2022, Cambridge, United Kingdom, 27-29 June 2022
EditorsMohammed Z.E.B. Elshafie, Giulia M.B. Viggiani, Robert J. Mair
Place of PublicationThe Netherlands
PublisherCRC Press/Balkema, Taylor & Francis Group
Pages217-225
Number of pages9
Edition1st
ISBN (Electronic)9780429321559
ISBN (Print)9780367337339
DOIs
Publication statusPublished - 27 May 2021

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