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Determining relative block structure rating for rock erodibility evaluation in the case of non-orthogonal joint sets

Boumaiza Lamine, Saeidi Ali et Quirion Marco. (2019). Determining relative block structure rating for rock erodibility evaluation in the case of non-orthogonal joint sets. Journal of Rock Mechanics and Geotechnical Engineering, 11, (1), p. 72-87.

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URL officielle: https://dx.doi.org/doi:10.1016/j.jrmge.2018.06.010

Résumé

The most commonly used method for assessing the hydraulic erodibility of rock is Annandale’s method. This method is based on a correlation between the erosive force of flowing water and the capacity of rock resistance. This capacity is evaluated using Kirsten’s index, which was initially developed to evaluate the excavatability of earth materials. For rocky material, this index is determined according to certain geomechanical factors related to the intact rock and the rock mass, such as the compressive strength of intact rock, the rock block size, the discontinuity shear strength and the relative block structure. To quantify the relative block structure, Kirsten developed a mathematical expression that accounted for the shape and orientation of the blocks relative to the direction of flow. Kirsten's initial concept for assessing relative block structure considers that the geological formation is mainly fractured by two joint sets forming an orthogonal fractured system. An adjusted concept is proposed to determine the relative block structure when the fractured system is non-orthogonal where the angle between the planes of the two joint set is greater or less than 90°. An analysis of the proposed relative block structure rating shows that considering a non-orthogonal fractured system has a significant effect on Kirsten’s index and, as a consequence, on the assessment of the hydraulic erodibility of rock.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:11
Numéro:1
Pages:p. 72-87
Version évaluée par les pairs:Oui
Date:Février 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:fractured rock, blocky rock, dip angle, dip direction, joint spacing, relative ground structure, hydraulic erodibility of rock, Annandale’s method, Kirsten’s index, roche fracturée, roche en blocs, angle d'immersion, direction de la pendaison, espacement des joints, structure relative du sol, érodabilité hydraulique de la roche, Méthode d'Annandale, Indice de Kirsten
Déposé le:10 janv. 2020 01:04
Dernière modification:10 janv. 2020 01:04
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