PIERRE 2: A STOCHASTIC ROCK FALL SIMULATOR – DEVELOPMENT, CALIBRATION AND APPLICATIONS

Andrew Mitchell, Oldrich Hungr

In the proceedings of: GeoQuébec 2015: 68th Canadian Geotechnical Conference & 7th Canadian Permafrost Conference

Session: Landslides and Slope Stability II / Mouvements de terrain et stabilité des pentes II

ABSTRACT: Computer models have become standard in assessing the hazards posed by rock falls, with a wide variety of models currently available. The PIERRE 2 model, presented here, returns to a simplified lumped-mass model assuming collinear impact conditions. The natural variability of rock falls is represented using: A stochastic roughness angle applied to the slope; Hyperbolic restitution factors to define the conservation of momentum; and, A stochastic shape factor, used to vary the sphere dimensions at impact. Impact mechanics theory was used as the basis for these features. Their validity is demonstrated through extensive 2D and 3D model calibration for five distinct sites. The calibration was directed to optimal simulation of rock fall behaviour in multiple dimensions, including runout distance, jump height and both linear and rotational velocity. The focus of the model development was to produce accurate statistical distributions of the outputs for hazard assessments with limited site information.

RÉSUMÉ: La chute des roches est un aléa qui est évalué en général avec des logiciels numériques, et il existe une variété de logiciels disponibles. Le logiciel PIERRE 2, présenté ici, utilise le modèle de masse concentrée, supposant des aturelle est représentée avec : La rugosité stochastique appliquée à la pente; Les facteurs de restitution hyperbolique déélan; et, Un facteur de forme stochastique, utilisé t. e pour les fondements du logiciel. La validité est démontrée avec le calibrage extensif du comporêt, la hauteur de passage, la vitesse linéaire et la rotation. éveloppement du logiciel était de faire une distribution statistique précise du rendement pour la détermination des aléas avec des informations restreintes sur le site.

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Cite this article:
Andrew Mitchell; Oldrich Hungr (2015) PIERRE 2: A STOCHASTIC ROCK FALL SIMULATOR – DEVELOPMENT, CALIBRATION AND APPLICATIONS in GEO2015. Ottawa, Ontario: Canadian Geotechnical Society.

@article{814,author = Andrew Mitchell; Oldrich Hungr,title = PIERRE 2: A STOCHASTIC ROCK FALL SIMULATOR – DEVELOPMENT, CALIBRATION AND APPLICATIONS,year = 2015}