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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 108
PROCEEDINGS OF THE FIFTEENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING
Edited by: J. Kruis, Y. Tsompanakis and B.H.V. Topping
Paper 154

Seismic Response of Hardfill Dams during Extreme Events

J.M. Mayoral1, M.P. Romo1, D. Vital1, N. Sarmiento1, E. Castañon1, H. Marengo2 and A. Díaz Barriga2

1Institute of Engineering, National University of Mexico, Mexico
2Federal Electricity Commission, Mexico

Full Bibliographic Reference for this paper
, "Seismic Response of Hardfill Dams during Extreme Events", in J. Kruis, Y. Tsompanakis, B.H.V. Topping, (Editors), "Proceedings of the Fifteenth International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 154, 2015. doi:10.4203/ccp.108.154
Keywords: risk analysis, hardfill, performance, dams, reliability, FLAC-3D.

Summary
This paper presents the seismic performance evaluation of a typical hardfill dam subjected to two strong ground motions using a novel practice-oriented approach. This approach allows revising both state limits of failure and service simultaneously. The bivariate point estimate method (BPEM) coupled with tri-dimensional finite difference models, is used to conduct the seismic dam-foundation-embankment interaction analyses accounting directly for the variability in the hardfill strength and deformability parameters. A series of three dimensional finite difference models were developed using the program FLAC-3D. The stress-strain relationship for the hardfill was represented using the Mohr-Coulomb failure criterion. The dam was subjected to a seismic environment established from the strong ground motion recorded near the Infiernillo Mexican Dam, during the 1985 Mw 8.1 Michoacán earthquake, scaled to two seismic intensities. The probability of seismic failure from uncertainties in the material properties and structural dam reliability was assessed, along with the vertical and horizontal dam displacements at the crest and dam body. The proposed methodology permits the identification of potentially weak areas within the dam body, and represents a rational procedure to estimate the seismic dam performance under moderate to strong shaking.

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