Postill et al (2021). Strength parameter selection framework for evaluating the design life of clay cut slopes.pdf (768.02 kB)
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Strength parameter selection framework for evaluating the design life of clay cut slopes

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journal contribution
posted on 07.10.2021, 08:31 by Harry Postill, Peter R Helm, Neil DixonNeil Dixon, Ashraf El-HamalawiAshraf El-Hamalawi, S Glendinning, WA Take
Design of engineered earthworks is predominately conducted through limit equilibrium analysis requiring strain independent strength criteria. Previous studies for deep-seated first-time failures within over-consolidated clay cut slopes have proposed the use of fully softened strength parameters for design. A study investigating shallow first-time failures in clay cut slopes due to seasonal stress cycles has been undertaken using a validated numerical model capable of capturing seasonal ratcheting and progressive failure. It is shown that fully softened strength criteria are inappropriate for the assessment of shallow first-time failures due to seasonal ratcheting and that slopes at angles between the material’s fully softened and residual friction angle may be at risk of failure in the future due to this behaviour. However, adopting residual strength parameters will likely result in overly conservative solutions considering the required design life of geotechnical assets. It is shown that the strain softening behaviour of clay defines the rate of strength deterioration and the operational life of engineered slopes. While general guidelines for analysis considering shallow first-time failures in clay cut slopes are made, detailed understanding of a material’s strain-softening behaviour, the magnitude and rate of strength reduction with strains, is needed to establish strength criteria for limit equilibrium analysis.

Funding

ISMART

Engineering and Physical Sciences Research Council

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Assessment, Costing and enHancement of long lIfe, Long Linear assEtS (ACHILLES)

Engineering and Physical Sciences Research Council

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History

School

  • Architecture, Building and Civil Engineering

Published in

Proceedings of the Institution of Civil Engineers - Geotechnical Engineering

Pages

1 - 21

Publisher

Thomas Telford Ltd.

Version

VoR (Version of Record)

Publisher statement

This is an Open Access Article. It is published by Thomas Telford under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

Publication date

2021-10-04

ISSN

1353-2618

eISSN

1751-8563

Language

en

Depositor

Prof Neil Dixon. Deposit date: 6 October 2021