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Undrained behaviour of intact soft clay under cyclic paths that match vehicle loading conditions

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Guo, Cai et al, as accepted, CGJ_2017.pdfAccepted version6.71 MBAdobe PDFView/Open
Title: Undrained behaviour of intact soft clay under cyclic paths that match vehicle loading conditions
Authors: Guo, L
Cai, Y
Jardine, RJ
Yang, Z
Wang, J
Item Type: Journal Article
Abstract: Vehicle traffic loading appears to contribute significantly to long term settlement beneath highways, airport runways and metro lines in China. Wheel loading imposes cycles in both the magnitude and direction of the principal stresses acting on the soils beneath pavement or rail-track structures. Conventional cyclic triaxial testing, which is not capable of imposing such stress paths may underestimate how heavy traffic loading affects any underlying soft clay layers. Hollow cylinder apparatus (HCA) can simulate such traffic loading stress paths more accurately, including rotation of the principal stress directions. This paper presents a systematic experimental study of cyclic HCA (CHCA) tests on K0-consolidated saturated soft clay involving cyclic variations in both vertical and torsional shear stresses, along with a parallel programme of cyclic triaxial (CT) tests, considering the undrained response of saturated samples of intact soft clay. It is shown that when applied above certain critical cyclic stress ratios, principal stress rotation accelerates excess pore water pressure and permanent strain development. Corresponding changes are also seen in the resilient modulus and damping ratio trends. The discrepancies between the behaviour of CHCA and equivalent cyclic triaxial tests grow as the cyclic stress ratios increase.
Issue Date: 27-Jun-2017
Date of Acceptance: 4-May-2017
URI: http://hdl.handle.net/10044/1/48441
DOI: https://dx.doi.org/10.1139/cgj-2016-0636
ISSN: 1208-6010
Publisher: NRC Research Press (Canadian Science Publishing)
Start Page: 90
End Page: 106
Journal / Book Title: Canadian Geotechnical Journal
Volume: 55
Issue: 1
Copyright Statement: © 2017 Canadian Geotechnical Society. All rights reserved.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/D506387/1
Keywords: Science & Technology
Technology
Physical Sciences
Engineering, Geological
Geosciences, Multidisciplinary
Engineering
Geology
soft clays
laboratory tests
settlement
stress path
repeated loading
PRINCIPAL STRESS ROTATION
MARINE CLAY
PERMANENT DEFORMATION
LABORATORY TESTS
SHEAR-STRENGTH
ANISOTROPY
STRAIN
SOIL
APPARATUS
TRACK
0905 Civil Engineering
0907 Environmental Engineering
Geological & Geomatics Engineering
Publication Status: Published
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering
Geotechnics



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