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Prediction of rock block stability and scour depth in plunge pools / Pooyan Asadollahi in Journal of hydraulic research, Vol. 49 N° 6 (Novembre/Décembre 2011) 

Public ISBD [article]  in Journal of hydraulic research > Vol. 49 N° 6 (Novembre/Décembre 2011) . - pp. 750-756 Titre : Prediction of rock block stability and scour depth in plunge pools Type de document : texte imprimé Auteurs : Pooyan Asadollahi, Auteur ; Tonon, Fulvio, Auteur ; Matteo P.E.A. Federspiel, Auteur Année de publication : 2012 Article en page(s) : pp. 750-756 Note générale : Hydraulique Langues : Anglais (eng) Mots-clés : Dam  safety  Fracture  Rock  Scour  Spillway Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : Block Stability in 3 Dimensions (BS3D) is an incremental-iterative algorithm and code to analyse general failure modes of rock blocks subjected to generic forces, including non-conservative forces such as water pressure. This algorithm is used to investigate the effect of high-velocity water jet impact on the stability of single rock blocks in plunge pools. After reviewing the literature, an approach is proposed to estimate the dynamic water pressure fluctuations at the pool bottom and in rock fractures. The approach is validated using an experimental study. In addition, by comparing the results of these analyses to additional experimental results, a scour threshold is introduced for plunge pools. It is found that if the maximum upward block displacement is larger than a quarter of the block height, the block is most probably removed from its mould. The proposed approach and threshold are validated using case histories that indicate excellent match between prediction and observed scour depth. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.618055 [article] Prediction of rock block stability and scour depth in plunge pools [texte imprimé] / Pooyan Asadollahi, Auteur ; Tonon, Fulvio, Auteur ; Matteo P.E.A. Federspiel, Auteur . - 2012 . - pp. 750-756. Hydraulique Langues : Anglais (eng) in Journal of hydraulic research > Vol. 49 N° 6 (Novembre/Décembre 2011) . - pp. 750-756 Mots-clés : Dam  safety  Fracture  Rock  Scour  Spillway Index. décimale : 627 Ingénierie des cours d'eau naturels, des ports, des rades et des cotes. Installations de navigation, de dragage, de récupération et de sauvetage. Barrages et centrales électriques hydrauliques Résumé : Block Stability in 3 Dimensions (BS3D) is an incremental-iterative algorithm and code to analyse general failure modes of rock blocks subjected to generic forces, including non-conservative forces such as water pressure. This algorithm is used to investigate the effect of high-velocity water jet impact on the stability of single rock blocks in plunge pools. After reviewing the literature, an approach is proposed to estimate the dynamic water pressure fluctuations at the pool bottom and in rock fractures. The approach is validated using an experimental study. In addition, by comparing the results of these analyses to additional experimental results, a scour threshold is introduced for plunge pools. It is found that if the maximum upward block displacement is larger than a quarter of the block height, the block is most probably removed from its mould. The proposed approach and threshold are validated using case histories that indicate excellent match between prediction and observed scour depth. DEWEY : 627 ISSN : 0022-1686 En ligne : http://www.tandfonline.com/doi/abs/10.1080/00221686.2011.618055