Caractérisation d’assemblages de pierre avec la presse à cisaillement giratoire

Luc Boisvert, Jean-Marie Konrad

In the proceedings of: GeoMontréal 2013: 66th Canadian Geotechnical Conference; 11th joint with IAH-CNC

Session: Earth Walls and Dams I

ABSTRACT: In order to evaluate the mechanical behaviour of assemblages of crushed granite particles under different hydric conditions, a series of tests have been conducted using a gyratory compactor. Different parameters of the equipment have been evaluated such as applied vertical stress (200 and 500 kPa) and inclination angle of the mold (1¡, 0,6¡ and 0,3¡) for three hydric conditions: ambient laboratory condition (R.H.= 40% to 60%), submerged in water and oven dry. The granitic stones used in this study did not show an important influence of the hydric condition on voids ratio evolution after one hundred revolutions. Nevertheless, the tests allowed to observe the influence of the different test parameters on the response of the rock particles, particularly with respect to particle breakage. The gyratory compactor showed an interesting potential in the evaluation of rockfill particles index properties. R…SUM… Dans le but dÕ”valuer le comportement m”canique de diff”rents assemblages de roche granitique concass”e, sous diff”rentes conditions hydriques, des essais ont ”t” effectu”s ‹ lÕaide dÕune presse ‹ cisaillement giratoire. Diff”rents param‘tres dÕessais de la presse tels que, la contrainte verticale (200 et 500 kPa) et lÕangle dÕinclinaison du moule (1¡, 0,6¡ et 0,3¡) ont ”t” utilis”s en consid”rant trois conditions hydriques : condition ambiante de laboratoire (H.R.= 40% ‹ 60%), condition immerg”e dans lÕeau et condition s‘che. La pierre granitique utilis”e a montr” peu dÕinfluence des diff”rentes conditions hydriques sur lÕ”volution des indices des vides obtenus dans les mat”riaux apr‘s cent r”volutions. Les essais ont cependant montr” lÕinfluence des diff”rents param‘tres dÕessais sur lÕendommagement de la pierre en termes de changement de la distribution granulom”trique et de formation de fines lors du broyage. Les essais ‹ la presse ‹ cisaillement giratoire ont montr” un potentiel dÕutilisation pour ”valuer le comportement m”canique des mat”riaux dÕenrochement ‹ partir des propri”t”s dÕindice obtenues.

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