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On the effectiveness of slope stabilising piles for soils with distinct strain-softening behaviour

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Title: On the effectiveness of slope stabilising piles for soils with distinct strain-softening behaviour
Authors: Kontoe, S
Summersgill, F
Potts, D
Lee, Y
Item Type: Journal Article
Abstract: The stabilisation of slopes with rows of discrete vertical piles is a commonly adopted method for both cuttings as well as embankment slopes. The majority of existing design procedures consider the pile only as an additional force or moment acting on the critical slip surface of the un-stabilised slope. Based on simplified models, existing design methodologies effectively ignore any interaction of the pile with the evolution of the failure mechanism, while they do not consider important aspects of soil behaviour for slope stability relating to strain softening response. This paper presents a numerical investigation that challenges the above-mentioned simplifications, demonstrating the importance of the soil-pile interaction. Two dimensional plane-strain hydro-mechanically coupled finite element analyses were performed to simulate the excavation of a slope, considering materials with both a strain softening and non-softening response. The impact of pile position and time of pile construction on the stability of a cutting were parametrically examined, comparing and contrasting the findings for the different material types. The results suggest that an oversimplification during design regarding the soil/pile interaction could entirely miss the critical failure mechanism.
Issue Date: 1-Apr-2022
Date of Acceptance: 29-Jul-2020
URI: http://hdl.handle.net/10044/1/81177
DOI: 10.1680/jgeot.19.P.386
ISSN: 1021-8637
Publisher: ICE Publishing
Start Page: 309
End Page: 321
Journal / Book Title: Geotechnique
Volume: 72
Issue: 4
Copyright Statement: © ICE Publishing, all rights reserved.
Sponsor/Funder: Geotechnical Consulting Group LLP
Funder's Grant Number: CISM_P60087
Keywords: Science & Technology
Technology
Engineering, Geological
Engineering
finite-element modelling
slopes
soil stabilisation
soil
structure interaction
DELAYED COLLAPSE
FAILURE
0905 Civil Engineering
0907 Environmental Engineering
0914 Resources Engineering and Extractive Metallurgy
Geological & Geomatics Engineering
Publication Status: Published
Online Publication Date: 2020-12-14
Appears in Collections:Civil and Environmental Engineering
Faculty of Engineering