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Lookup NU author(s): Dr Peter HelmORCiD
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Progressive failure of cutting slopes in stiff clay can be analysed by coupled hydro-mechanical analyses. But suchanalyses are computationally expensive and reserved for research or large-scale projects. In routine practice, limitequilibrium method (LEM) is still commonly used. However, it is beyond LEM’s capability to replicate the mechanismsof progressive failure, or subsequent deterioration under current and future climate scenarios. Analysis is oftencarried out with conservative assumptions (e.g., using critical state strength) for long-term soil and groundwaterconditions, when these vary temporally. In this study, an alternative method that considers soil strength to be atransient parameter allows for a design-life based approach to be developed. Mobilised strength parameters as afunction of time and slope geometry have been derived from the outputs of a series of coupled hydro-mechanicalanalyses, for cuttings in London Clay, using a regression model. It is demonstrated that peak strength parametersshould be used to search for the critical slip surface (CSS) during LEM analysis. The CSS is then fixed, and insubsequent analyses mobilised strength parameters are suggested according to the design-life. The design-life basedapproach permits generation of design charts. A case example is used to demonstrate the application and potentialbenefits of the proposed approach.
Author(s): Huang W, Loveridge F, Johnston I, Helm P, Dixon N
Editor(s): Toll DG; Winter MG;
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: Geo-Resilience 2023
Year of Conference: 2023
Online publication date: 24/02/2024
Acceptance date: 28/03/2023
Publisher: British Geotechnical Association
URL: https://doi.org/10.53243/Geo-Resilience-2023-2-4
DOI: 10.53243/Geo-Resilience-2023-2-4
Notes: Session 2 - Resilience of Earthworks
