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Evaluation of the overflow failure scenario and hydrograph of an embankment dam with a concrete upstream slope protection

François Chiganne, Claude Marche and Tew-Fik Mahdi

Article (2014)

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Cite this document: Chiganne, F., Marche, C. & Mahdi, T.-F. (2014). Evaluation of the overflow failure scenario and hydrograph of an embankment dam with a concrete upstream slope protection. Natural Hazards, 71(1), p. 21-39. doi:10.1007/s11069-013-0897-2
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The standard procedure in Quebec, Canada, for evaluating the failure of an embankment dam, per the Loi sur la sécurité des barrages, specifies a 30-min-long failure scenario with a breach width equal to four times the maximal height of the dam. We demonstrate a new method for evaluating the flood overtopping failure scenario for embankment dams with concrete upstream slope protection, using Toulnustouc dam for example computations. Our new methodology computes safety factors for a range of potential failure mechanisms taking into account geotechnical, hydraulic, and structural factors. We compile the results of our investigations of the various dam failure mechanisms and compare the corresponding dam failure hydrographs to the current hydrograph specified in the standard analysis procedures. Our investigations tend to invalidate the current standard procedures for evaluating the failure of rock-fill dams with concrete upstream faces, by indicating that the current standard procedures underestimate the peak failure discharge and overestimate the time to the peak discharge.

Uncontrolled Keywords

Dam failure; Overtopping; Rock-fill dam; Failure hydrograph

Open Access document in PolyPublie
Subjects: 1100 Génie des structures > 1100 Génie des structures
1400 Génie minier et minéral > 1403 Mécanique des roches
4500 Hydrologie > 4502 Hydrologie physique
Department: Département des génies civil, géologique et des mines
Research Center: Non applicable
Date Deposited: 13 Jul 2020 18:25
Last Modified: 14 Jul 2020 01:20
PolyPublie URL: https://publications.polymtl.ca/5314/
Document issued by the official publisher
Journal Title: Natural Hazards (vol. 71, no. 1)
Publisher: Springer
Official URL: https://doi.org/10.1007/s11069-013-0897-2


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