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Experimental investigation into rockfill dam failure initiation by overtopping

Nasrin Javadi, Tew-Fik Mahdi

Article (2014)

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Abstract

Rockfill is the most abundant building material. It is often used for water retention under different contexts, such as dams, embankments or drainage systems. Climate change may cause water levels to rise in reservoirs. As rockfill structures are not able to resist strong overtopping flow, rising water levels will constitute a danger for rockfill dam stability as well as for people living nearby. This work is aimed at the development of an empirical formula that enables calculation of the critical water level of overflow at the crest from the geometrical and physical parameters of a dam. To achieve these objectives, several experimental tests on a rockfill dam model with two different impervious cores, moraine with a sand filter and an empty wooden formwork, were conducted in a hydraulic channel at the hydro-environmental laboratory at École Polytechnique de Montréal. The purpose of these tests was to study the initiation of a riprap failure under the influence of different variables, such as rock size, riprap bank, downstream side slope and bed slope. Results showed linear trends between the critical water level and both the downstream side slope and bed slope. Also, a power trend was observed between the critical level and riprap grain size. A formula that gives the critical overtopping water level was developed from these results.

Uncontrolled Keywords

Laboratory tests; Initiation of dam failure; Overtopping level; Critical hydraulic gradient

Subjects: 1000 Civil engineering > 1006 Hydrologic engineering
1100 Structural engineering > 1100 Structural engineering
1400 Mining and mineral processing > 1403 Rock mechanics
Department: Department of Civil, Geological and Mining Engineering
Funders: CRSNG/NSERC
PolyPublie URL: https://publications.polymtl.ca/5315/
Journal Title: Natural Hazards (vol. 74, no. 2)
Publisher: Springer
DOI: 10.1007/s11069-014-1201-9
Official URL: https://doi.org/10.1007/s11069-014-1201-9
Date Deposited: 13 Jul 2020 18:14
Last Modified: 25 Nov 2022 04:28
Cite in APA 7: Javadi, N., & Mahdi, T.-F. (2014). Experimental investigation into rockfill dam failure initiation by overtopping. Natural Hazards, 74(2), 623-637. https://doi.org/10.1007/s11069-014-1201-9

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