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Evaluation of hardening soil model on numerical simulation of behaviors of high rockfill dams

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Author(s): Pornthap Pramthawee | Pornkasem Jongpradist | Warat Kongkitkul

Journal: Songklanakarin Journal of Science and Technology
ISSN 0125-3395

Volume: 33;
Issue: 3;
Start page: 325;
Date: 2011;
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Keywords: high rockfill dam | constitutive model | simulation | shear dilatancy | hardening soil model

ABSTRACT
With the continual increase in the height of concrete face rockfill dams constructed during this decade, the hyperbolicelastic model conventionally used in the numerical analyses of lower-height rockfill dams in the past practice becomes insufficientto reproduce the key responses of rockfills of high dam constructions and impoundments. This research aims atevaluating the ability of the elasto-plastic with isotropic hardening (HS) model for simulating more realistic responses in theanalysis of high concrete face rockfill dams. The HS model and, for comparison, the hyperbolic elastic model are numericallyimplemented into a finite element program ABAQUS through the user subroutine to analyze the behaviors of rockfills underconstruction of a 182 m high dam. To obtain the reliable parameters in the analyses, the laboratory triaxial testing data ofrockfills from actual construction are adopted and the calibration by model simulation is also conducted. The analysis resultsfrom both models are compared to the high-quality instrumented data of dam construction. It is proven that by using the HSconstitutive model with the appropriately calibrated model parameters, the response of the rockfills under dam constructioncondition can be more accurately simulated.

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