Constitutive Models for Simulation of Field Performance of Dams
Publication: International Journal of Geomechanics
Volume 11, Issue 6
Abstract
Numerical models fitting long-term monitoring results represent a useful tool for understanding behavior of dams, especially if unusual performance jeopardizing safety is observed and rehabilitation measures should be suggested. Path-dependent and time-dependent constitutive models suitable for simulating observed behavior of concrete and rockfill dams are described in this paper. For the mechanical part of the solutions, a combined model using path-dependent incrementally linear elasticity in the prepeak regime and theory of plasticity in the peak regime is applied. For the time-dependent part of the solutions, the theory of multiface viscoplasticity is used. Three-surface-viscoplastic flow combined with Feda’s experimental relationships was successfully applied for modeling long-term creep of rockfill undergoing permanent structural changes attributable to grain breakage. By using a synthesis of these models, the reason of unexpectedly large deformations of Sance Rockfill Dam was pinpointed, future performance of the dam predicted, and cracking and hydraulic-fracturing hazard to the clay core estimated. The modeling results provided input for the rehabilitation concept of the dam.
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Acknowledgments
The work was partially supported by the Grant Agency of the Czech Republic, Project No. UNSPECIFIED103/04/0672.
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Published In
International Journal of Geomechanics
Volume 11 • Issue 6 • December 2011
Pages: 477 - 489
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Sep 18, 2009
Accepted: Mar 23, 2010
Published online: Nov 15, 2011
Published in print: Dec 1, 2011
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