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A laboratory characterisation of the response of intact chalk to cyclic loading

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Title: A laboratory characterisation of the response of intact chalk to cyclic loading
Authors: Ahmadi-Naghadeh, R
Liu, T
Vinck, K
Jardine, RJ
Kontoe, S
Byrne, BW
McAdam, RA
Item Type: Journal Article
Abstract: This paper reports the cyclic behaviour of chalk, which has yet to be studied comprehensively. Multiple undrained high-resolution cyclic triaxial experiments on low-to-medium density intact chalk, along with index and monotonic reference tests, define the conditions under which either thousands of cycles could be applied without any deleterious effect, or failure can be provoked under specified numbers of cycles. Intact chalk's response is shown to differ from that of most saturated soils tested under comparable conditions. While chalk can be reduced to putty by severe two-way displacement-controlled cycling, its behaviour proved stable and nearly linear visco-elastic over much of the one-way, stress controlled, loading space examined, with stiffness improving over thousands of cycles, without loss of undrained shear strength. However, in cases where cyclic failure occurred, the specimens showed little sign of cyclic damage before cracking and movements on discontinuities lead to sharp pore pressure reductions, non-uniform displacements and the onset of brittle collapse. Chalk's behaviour resembles the fatigue response of metals, concretes and rocks, where micro-shearing or cracking initiates on imperfections that generate stress concentrations; the experiments identify the key features that must be captured in any representative cyclic loading model.
Date of Acceptance: 12-Jan-2022
URI: http://hdl.handle.net/10044/1/95514
DOI: 10.1680/jgeot.21.00198
ISSN: 0016-8505
Publisher: ICE Publishing
Journal / Book Title: Géotechnique
Copyright Statement: © 2022 The ICE. This author accepted version is available under a CC-BY licence (https://creativecommons.org/licenses/by/4.0/)
Sponsor/Funder: Engineering & Physical Science Research Council (E
Ørsted WIND POWER A/S
Scottishpower Renewables (UK) Limited
Equinor Energy AS
Siemens Gamesa Renewable Energy A/S
Innogy SE
Eoliennes en Mer Dieppe Le Transport
Parkwind NV
Ørsted WIND POWER A/S
Equinor Energy AS
Parkwind NV
Scottishpower Renewables (UK) Limited
Eoliennes en Mer Dieppe Le Treport
Vattenfall Wind Power Ltd
Innogy SE
Siemens Gamesa Renewable Energy A/S
Engineering and Physical Sciences Research Council
Funder's Grant Number: EP/P033091/1
4700017327
TBC
4590086392
478D/9703582556
PO No: 4300010104
TBC
N/A (Linked to: EP/P033091/1)
4700027618
N/A
CISM_P85292
PO 4700338074
CISM_P84273
CISM_P84279
CISM_P85295
PO : 9705600999
CISM_P89393
Keywords: Geological & Geomatics Engineering
0905 Civil Engineering
0907 Environmental Engineering
0914 Resources Engineering and Extractive Metallurgy
Publication Status: Published online
Online Publication Date: 2022-03-14
Appears in Collections:Civil and Environmental Engineering



This item is licensed under a Creative Commons License Creative Commons