Journal
GEOTEXTILES AND GEOMEMBRANES
Volume 27, Issue 4, Pages 308-312Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.geotexmem.2008.11.008
Keywords
Geofoam; Seismic; Rigid retaining wall; Numerical analysis; Equivalent-linear method; Constitutive model
Funding
- Natural Sciences and Engineering Research Council of Canada
- Academic Research Program at RMC
- Department of National Defence (Canada)
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The paper describes two constitutive models for the simulation of expanded polystyrene (EPS) seismic buffer shaking table tests previously reported by the writers. The first model is linear elastic-plastic with Mohr-Coulomb criterion and Rayleigh damping. The second is called the equivalent-linear method (ELM) which incorporates hysteretic load-unload cycles using Masing-type functions and strain-dependent shear modulus and damping ratio functions. The constitutive models were applied to both the geofoam buffer and sand backfill in both approaches. Both models are shown to capture qualitative features of measured peak load-time response of the physical tests. The advanced ELM model gave predictions that were closer to the measured results for the seismic buffer test with the most compressible EPS when model accelerations and total wall forces were greatest. However, the simpler model is judged to be sufficiently accurate for practical purposes when the dynamic force increment is considered only. Crown Copyright (C) 2008 Published by Elsevier Ltd. All rights reserved.
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