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Correlation between liquefaction resistance and shear wave velocity of granular soils: a micromechanical perspective

Cheng, YP; Xu, XM; Chen, YM; Ling, DS; (2015) Correlation between liquefaction resistance and shear wave velocity of granular soils: a micromechanical perspective. Géotechnique , 65 (5) 337- 348. 10.1680/geot.SIP.15.P.022. Green open access

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Abstract

The shear wave velocity method has become an increasingly popular means to evaluate the liquefaction potential of granular soils. Understanding the fundamental mechanism underlying existing empirical or semi-empirical relationships is important for better assessing their reliability. This paper presents a particle-scale study of the correlation between cyclic resistance ratio (CRR) and the shear wave velocity corrected for overburden stress (V s1). The discrete-element method was used to simulate a series of undrained stress-controlled cyclic triaxial tests together with shear wave velocity (V s) measurements. Discrete-element method modelling with various relative densities, confining pressures and micro-parameters was performed under various cyclic stress ratios (CSRs), and the onset of liquefaction was illustrated through both macroscopic and microscopic responses, for example, inferred excess pore-water pressure, mechanical coordination number and redundancy index. The inter-particle friction was identified as the key micro-parameter that governs the liquefaction resistance of granular soils. A micro-scale CRR–V s1 correlation considering two independent micro-parameters, inter-particle friction and particle shear modulus, was then obtained and further validated with the outcomes from three dynamic centrifuge model tests performed on silica sand no. 8. This study demonstrates that the CRR–V s1 correlation is particle specific, thus soil specific, and the particle mechanical properties should be included in the V s-based method for future liquefaction evaluation of granular soils.

Type: Article
Title: Correlation between liquefaction resistance and shear wave velocity of granular soils: a micromechanical perspective
Open access status: An open access version is available from UCL Discovery
DOI: 10.1680/geot.SIP.15.P.022
Publisher version: http://dx.doi.org/10.1680/geot.SIP.15.P.022
Language: English
Additional information: copyright@icepublishing.com.
Keywords: Particle-scale behaviour; centrifuge modelling; discrete-element modelling; liquefaction.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1465984
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