Predicting the long-term performance of a wide embankment on soft soil using an elastic-viscoplastic model

Karim, M.R. and Gnanendran, C.T. and Lo, S.C.R. and Mak, J. (2010) Predicting the long-term performance of a wide embankment on soft soil using an elastic-viscoplastic model. Canadian Geotechnical Journal, 47 (2). pp. 244-257. ISSN 0008-3674

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Abstract

This paper presents modelling of the consolidation of foundation soil under a wide embankment constructed over soft soil. An elastic-viscoplastic (EVP) constitutive model is used to represent the foundation soil for the coupled finite element analysis (FEA). A unit-cell analysis is carried out to capture the maximum settlement and the development of excess pore-water pressure with time below the centreline of the embankment for a long period (9 years). A new function for capturing the varying nature of the creep or secondary compression coefficient is proposed and used in association with the EVP model. The input material parameters for this study were determined from extensive laboratory experiments except for the equivalent horizontal permeability, which was systematically estimated by using vertical permeability data obtained from one-dimensional consolidation tests and by back-analysing the first 12 months of field settlement data. Comparisons are made among the predictions obtained adopting an elastoplastic modified Cam clay model and the EVP model with constant and varying creep coefficients for the foundation soil and the corresponding field data. The predictions with the EVP model are found to be better than those with the elastoplastic model and the use of a varying creep coefficient for the EVP model seems to further improve its predicting ability.

Item Type: Article
Additional Information: 554YJ Times Cited:6 Cited References Count:31
Uncontrolled Keywords: Creep, Embankments, Soft clay, Time dependency, Viscoplasticity, Creep coefficient, Elastic viscoplastic, Elasto-plastic, Elasto-plastic models, Field data, Finite element analysis, Foundation soils, Laboratory experiments, Long term performance, Material parameter, Modified Cam-clay model, One dimensional consolidation, Pore-water pressures, Secondary compression, Settlement data, Soft clays, Soft soils, Unit cells, Vertical permeabilities, Canals, Capillarity, Constitutive models, Elastoplasticity, Forecasting, Hydraulic structures, Plasticity, Soils, Viscosity, Water analysis, Geologic models, consolidation, data acquisition, elastic property, embankment, finite element method, foundation, laboratory method, one-dimensional modeling, parameterization, permeability, porewater, pressure effect, soft soil, time dependent behavior
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Divisions: Faculty of Engineering
Depositing User: Mr Jenal S
Date Deposited: 04 Apr 2014 01:22
Last Modified: 04 Apr 2014 01:22
URI: http://eprints.um.edu.my/id/eprint/8778

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