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Vertical ground motion and its effects on liquefaction resistance of fully saturated sand deposits

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Title: Vertical ground motion and its effects on liquefaction resistance of fully saturated sand deposits
Authors: Tsaparli, V
Kontoe, S
Taborda, D
Potts, DM
Item Type: Journal Article
Abstract: Soil liquefaction has been extensively investigated over the years with the aim to understand its fundamental mechanism and successfully remediate it. Despite the multi-directional nature of earthquakes, the vertical seismic component is largely neglected, as it is traditionally considered to be of much lower amplitude than the components in the horizontal plane. The 2010–2011 Canterbury earthquake sequence in New Zealand is a prime example that vertical accelerations can be of significant magnitude, with peak amplitudes well exceeding their horizontal counterparts. As research on this topic is very limited, there is an emerging need for a more thorough investigation of the vertical motion and its effect on soil liquefaction. As such, throughout this study, uni- and bidirectional finite-element analyses are carried out focusing on the influence of the input vertical motion on sand liquefaction. The effects of the frequency content of the input motion, of the depth of the deposit and of the hydraulic regime, using variable permeability, are investigated and exhaustively discussed. The results indicate that the usual assumption of linear elastic response when compressional waves propagate in a fully saturated sand deposit does not always hold true. Most importantly post-liquefaction settlements appear to be increased when the vertical component is included in the analysis.
Issue Date: 31-Aug-2016
Date of Acceptance: 4-Aug-2016
URI: http://hdl.handle.net/10044/1/38757
DOI: https://dx.doi.org/10.1098/rspa.2016.0434
ISSN: 1471-2946
Publisher: Royal Society, The
Journal / Book Title: Proceedings of the Royal Society A: Mathematical, Physical & Engineering Sciences
Volume: 472
Issue: 2192
Copyright Statement: © 2015 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
Sponsor/Funder: Geotechnical Consulting Group
Funder's Grant Number: GCG Chair
Keywords: bidirectional loading
liquefaction
post-liquefaction settlements
variable permeability
vertical motion
01 Mathematical Sciences
02 Physical Sciences
09 Engineering
Publication Status: Published
Open Access location: http://rspa.royalsocietypublishing.org/content/472/2192/20160434.article-info
Appears in Collections:Civil and Environmental Engineering
Geotechnics



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