Stress–strain response of soft clay to traffic loading

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Title: Stress–strain response of soft clay to traffic loading
Authors: Cai, YQ
Guo, L
Jardine, RJ
Yang, ZX
Wang, J
Item Type: Journal Article
Abstract: Approximately 25% of China's 120 000 km of expressway, as well as many new metro lines and airports, rest on soft clay deposits. However, service settlements are proving larger than expected, especially in southeast China. This note describes laboratory experiments on K0-consolidated intact samples of soft clay taken near Wenzhou, south-east China, that explore whether cyclic traffic wheel loading contributes significantly to the observed settlement trends. Cyclic triaxial (CT) tests are reported together with cyclic hollow cylinder (CHCA) experiments that imposed cardioid-shaped 2τzθ − (Δσz − Δσθ) stress paths. Cyclic principal stress axis rotation is shown to have an important influence on vertical straining. Once a certain threshold has been exceeded, the resilient and permanent strains developed in the CHCA tests become progressively larger than their counterparts in CT tests conducted at the same vertical cyclic stress ratio, with trends that diverge progressively as vertical cyclic stress ratio increases. Critical cyclic stress ratios can be defined that divide the response into (a) stable, (b) metastable and (c) unstable cyclic ranges. The novel experimental approach and high-quality data reported should aid practitioners and modellers in developing new analyses to address this economically significant geotechnical problem.
Issue Date: 16-Nov-2016
Date of Acceptance: 11-Oct-2016
URI: http://hdl.handle.net/10044/1/43042
DOI: https://dx.doi.org/10.1680/jgeot.15.P.224
ISSN: 0016-8505
Publisher: ICE Publishing
Start Page: 446
End Page: 451
Journal / Book Title: Géotechnique
Volume: 67
Issue: 5
Copyright Statement: © 2016 The ICE. Original article available at http://www.icevirtuallibrary.com/doi/10.1680/jgeot.15.P.224. Permission is granted by ICE Publishing to print one copy for personal use. Any other use of these PDF files is subject to reprint fees
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/D506387/1
Keywords: Science & Technology
Technology
Engineering, Geological
Engineering
clays
deformation
embankments
laboratory tests
repeated loading
stiffness
stress path
PERMANENT DEFORMATION
UNDRAINED ANISOTROPY
SATURATED SAND
MARINE CLAY
BEHAVIOR
ROTATION
SHEAR
SOIL
APPARATUS
TESTS
Geological & Geomatics Engineering
0905 Civil Engineering
Publication Status: Published
Appears in Collections:Faculty of Engineering
Civil and Environmental Engineering



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