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A method to determine relevant geomechanical parameters for evaluating the hydraulic erodibility of rock

Boumaiza Lamine, Saeidi Ali et Quirion Marco. (2019). A method to determine relevant geomechanical parameters for evaluating the hydraulic erodibility of rock. Journal of Rock Mechanics and Geotechnical Engineering, 11, (5), p. 1004-1018.

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URL officielle: https://dx.doi.org/doi:10.1016/j.jrmge.2019.04.002

Résumé

Among the methods used for evaluating the potential hydraulic erodibility of rock, the most common methods are those based on the correlation between the force of flowing water and the capacity of a rock to resist erosion, such as Annandale's and Pells' methods. The capacity of a rock to resist erosion is evaluated based on erodibility indices that are determined from specific geomechanical parameters of a rock mass. These indices include unconfined compressive strength (UCS) of rock, rock block size, joint shear strength, a block's shape and orientation relative to the direction of flow, joint openings, and the nature of the surface to be potentially eroded. However, it is difficult to determine the relevant geomechanical parameters for evaluating the hydraulic erodibility of rock. The assessment of eroded unlined spillways of dams has shown that the capacity of a rock to resist erosion is not accurately evaluated. Using more than 100 case studies, we develop a method to determine the relevant geomechanical parameters for evaluating the hydraulic erodibility of rock in unlined spillways. The UCS of rock is found not to be a relevant parameter for evaluating the hydraulic erodibility of rock. On the other hand, we find that the use of three-dimensional (3D) block volume measurements, instead of the block size factor used in Annandale's method, improves the rock block size estimation. Furthermore, the parameter representing the effect of a rock block's shape and orientation relative to the direction of flow, as considered in Pells' method, is more accurate than the parameter adopted by Annandale's method.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:11
Numéro:5
Pages:p. 1004-1018
Version évaluée par les pairs:Oui
Date:Octobre 2019
Sujets:Sciences naturelles et génie > Sciences naturelles > Sciences de la terre (géologie, géographie)
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Unité d'enseignement en sciences de la Terre
Mots-clés:rock mass, hydraulic erodibility, geomechanical parameters, rock block size, Annandale's method, Pells' method, Kirsten's index, erosion level, masse rocheuse, érodabilité hydraulique, paramètres géomécaniques, taille des blocs rocheux, Méthode d'Annandale, Méthode de Pells, Indice de Kirsten, niveau d'érosion
Déposé le:10 janv. 2020 01:08
Dernière modification:10 janv. 2020 01:08
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