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

Journal of Rock Mechanics and Geotechnical Engineering 2019年第5期11卷 1004-1018页

作者： Lamine Boumaiza Ali saeidi Marco Quirion Département des sciences appliquées Universitédu QuébecàChicoutimiChicoutimiG7H 2B1Canada Expertise en barrages Direction Barrages et infrastructuresHydro-QuébecMontréalH2Z 1A4Canada

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’*** capacity of a rock to resist erosion is evaluated based on erodibility indices that are determined from specific geomechanical parameters of a rock *** 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 ***,it is difficult to determine the relevant geomechanical parameters for evaluating the hydraulic erodibility of *** assessment of eroded unlined spillways of dams has shown that the capacity of a rock to resist erosion is not accurately *** more than 100 case studies,we develop a method to determine the relevant geomechanical parameters for evaluating the hydraulic erodibility of rock in unlined *** UCs of rock is found not to be a relevant parameter for evaluating the hydraulic erodibility of *** 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 ***,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.

关键词： Rock mass Hydraulic erodibility Geomechanical parameters Rock block size annandale’s method Pells’method Kirsten’s index Erosion level

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

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Journal of Rock Mechanics and Geotechnical Engineering 2019年第1期11卷 72-87页

作者： Lamine Boumaiza Ali saeidi Marco Quirion Department of Applied saences University of Quebec at Chicoutimi Hydro-Quebec

The most commonly used method for assessing the hydraulic erodibility of rock is annandale's *** 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 intact rock and rock mass, such as compressive strength of intact rock, rock block size, discontinuity shear strength and relative block structure. To quantify the relative block structure, Kirsten(1982) developed a mathematical expression that accounts for the shape and orientation of the blocks relative to the direction of flow. Kirsten's initial concept for assessing the relative block structure considers that the geological formation is mainly fractured by two joint sets forming an orthogonally 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 sets is greater or less than 90°. An analysis of the proposed relative block structure rating shows that considering a non-orthogonally fractured system has a significant effect on Kirsten's index and, as a consequence, on the assessment of the hydraulic erodibility of rock.

关键词： Fractured rock Dip angle Dip direction Joint spacing Relative block structure Hydraulic erodibility of rock annandale’s method Kirsten’s index

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