Discussion. Through and Overflow Rockfill Dams - New Design Techniques.

Olivier, H; Little, A L; Williams, J; Palnitkar, V. G.; Lawson, John D.; Broughton, T; Knight, D J; Sutherland, R. A.; Prosser, Le; Saunders, D H; Back, Pär-Erik; Parkin, Alan K.; Curtis, P.; Wilkins, J K; Avramov, G

doi:10.1680/iicep.1967.8309

Cited by 10 publications

(18 citation statements)

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“…number of stones per unit area) are used to describe the quality of the placement. The dimensionless packing factor P c defined by Linford and Saunders (1967) and Olivier (1967) …”

Section: Riprap Parametersmentioning

confidence: 99%

Field and model tests of riprap on steep slopes exposed to overtopping

Hiller

Lia

Aberle

2018

Journal of Applied Water Engineering and Research

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The comparability of large-scale field tests of dumped and placed riprap with a stone diameter of 0.37 m and corresponding model tests in a scale of 1:6.5 was investigated in terms of stability, packing density and visually observed flow pattern. The tested riprap protections were exposed to overtopping on a slope of 1:1.5 (vertical: horizontal). The results for dumped riprap revealed similarity between the field and model tests based on the critical stone-related Froude number as a measure of the stability, packing density, flow pattern and overtopping depth. The field and model tests with placed riprap showed good agreement in regard to flow pattern and overtopping depth. However, the placed riprap in the model tests was denser packed and more stable than in the field indicating laboratory effects. Placed riprap withstood up to 10 times higher unit discharges than dumped riprap, 6-8 m 2 s −1 in the field tests.

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“…number of stones per unit area) are used to describe the quality of the placement. The dimensionless packing factor P c defined by Linford and Saunders (1967) and Olivier (1967) …”

Section: Riprap Parametersmentioning

confidence: 99%

Field and model tests of riprap on steep slopes exposed to overtopping

Hiller

Lia

Aberle

2018

Journal of Applied Water Engineering and Research

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“…Exceptionally, concrete-faced rockfill dams can keep stable when subjected to through seeping flow or overtopping flow at the initial construction stage when the dam is not high, which is clearly an important advantage over earthfill structures. However, the velocity of flow on dam face should be controlled within 5-7 m/s, and reliable protection measures against scouring should be adopted (Chanson 2009;Olivier 1967). …”

Section: Requirements For Rockfill Dams (A) Prevention Of Overtoppingmentioning

confidence: 99%

“…However, if the initial erosion is prevented by securely anchoring the larger rocks, the rockfill mass will remain stable under flow gradients far greater than those which would otherwise cause failure. Based on these understanding, rockfill may be designed to be stable when subjected to through flow or overflow (Olivier 1967), clearly an important advantage of rockfill dams over earthfill structures subject to overtopping during construction.…”

Section: Layout Of Flood Releasing Work and Balance Between Excavatimentioning

confidence: 99%

Rockfill Dams

Chen¹

2015

Hydraulic Structures

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Rockfill dam, a kind of embankment or so called earth-rock dams, is a water retaining barrier composed of three major parts: fill of loose rock by dumping or roller compaction; impervious membrane made of masonry, concrete, asphaltic concrete, steel sheet piles, timber, or other materials; and transition layer. The impervious membrane is employed as the waterproof and can be placed either within the embankment or on the upstream slope. Although the history is short compared to that of other ancient dam types, the development of rockfill dams during the last several decades was booming around the world (Chen et al.

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“…Leps (1973) presented an excellent review and analysis of several experiences in which large flows have passed through rock.fill embankments, including examples of hundreds of cubic metres per second. Dams have even been built in which small spillway floods are discharged directly into the downstream rock.fill zones (Wilkins, 1963;Olivier, 1967;Curtis and Lawson, 1967). Also there have been several cases where floods backed up water behind rock.fill dams during construction, before the impervious element was constructed, causing very large flows to pass through the rock:fill without damage.…”

Section: Simplified Illustrative Example Of Fundamentally Safe Dammentioning

confidence: 99%