Concrete Slab Dynamic Damage Analysis of CFRD Based on Concrete Nonuniformity
Publication: International Journal of Geomechanics
Volume 17, Issue 9
Abstract
In general, a concrete slab of a concrete-faced rockfill dam (CFRD) is viewed as a macroscopically uniform but microscopically nonuniform material. Study of the damage process of high CFRD subjected to strong motion is crucial for evaluating its safety during an earthquake. Therefore, dynamic analysis with consideration of the nonuniformity of the concrete should reveal the damage mechanism and provide suggestions for engineering design. In this paper, the elastic–brittle damage model proposed by others and applied to the failure simulation of rock and concrete under static loading was developed for this purpose. The impact of the randomness of the modulus of elasticity and tensile strength of concrete on the distribution characteristics of mechanical damage of the face slab of the rockfill dam was studied. The study considered the randomness of the distribution of material parameters combined with principles of statistics, analyzed using two-dimensional finite-element numerical analysis. The results of the calculation indicate that when the randomness of material parameters of the concrete slab was not considered, the stress of the face slab along the slope direction was larger at ∼0.65–0.85H (H is the dam height) and the tensile damage occurred mainly near 0.8H. As the nonuniformity of the concrete material increased, the location in which tensile damage occurred tended to vary but was concentrated mainly in the ∼0.4–0.9H region of the slab. As a consequence, this part of the face slab is the seismic design focus region. Through the use of elastic–brittle micromechanical damage models and by considering the material parameter randomness, the seismic damage process, damage distribution, and typical damage modes can be intuitively illustrated, which makes it easier to understand the weak points of the slab. The results of this study can provide a reference for the seismic design of CFRD.
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Acknowledgments
This study was jointly supported by the National Natural Science Foundation of China (Grants 51421064, 51679029, 51379028, and 51508071). The authors greatly acknowledge all this financial support and express their sincerest gratitude.
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Published In
International Journal of Geomechanics
Volume 17 • Issue 9 • September 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Jun 30, 2016
Accepted: Feb 13, 2017
Published online: May 24, 2017
Published in print: Sep 1, 2017
Discussion open until: Oct 24, 2017
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