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Probabilistic Rock Fall Assessment: Accounting for the Effects of Engineered Mitigation

M Lato

In the proceedings of: GeoVancouver 2016: 69th Canadian Geotechnical Conference

Session: GEOHAZARDS - I Climate Change Floods & Landslides

ABSTRACT: Identification and assessment of rock fall hazard are critical components in risk management systems for the safe operation of linear transportation corridors. Traditional rock fall hazard assessments rely on formalized summation-based systems requiring engineering judgement and field evaluation of rock mass conditions and topographic settings; such systems are widely used across North America by transportation authorities. These systems do not typically account very well for risk mitigation through engineered works. The probabilistic rock fall risk assessment presented in this paper is designed to estimate the annual probability of rock fall occurrence within designated volume classes and the spatial likelihood that the rock fall will reach the transportation corridor, potentially causing impassable conditions. The methodology incorporates rock fall frequency, frequency-magnitude distributions, ditch effectiveness, and allowance for various forms of engineering mitigation. The incorporation of parameters to account for engineering mitigation allows owners and operators to estimate the cost-benefit of risk reduction efforts.

RÉSUMÉ: dentification et évaluation des risques de chute de roche sont des éléments essentiels dans les systèmes de gestion des risques pour les couloirs de transport linéaires. Les évaluations des risques traditionnels reposent sur des systèmes à base de sommation formalisés nécessitant un jugement d'ingénierie et d'évaluation sur le terrain des conditions et paramètres topographiques; de tels systèmes sont largement utilisés en Amérique du Nord par les autorités de transport. d'ingénierie. L'évaluation des risques de chute de roche probabiliste présentée dans ce document est conçu pour estimer la probabilité annuelle de chute de roche survenue dans les classes de volume désignés et la probabilité spatiale que la chute de roche atteindra le corridor de transport. La méthodologie intègre la fréquence de chute, les distributions de fréquence de magnitude, l'efficacité du fossé, et l'allocation pour diverses formes d'atténuation de l'ingénierie. L'incorporation de paramètres pour tenir compte des mesures d'atténuation de l'ingénierie permet aux propriétaires et aux exploitants d'estimer le rapport coût-bénéfice des efforts de réduction des risques.

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Cite this article:
M Lato (2016) Probabilistic Rock Fall Assessment: Accounting for the Effects of Engineered Mitigation in GEO2016. Ottawa, Ontario: Canadian Geotechnical Society.

@article{3677_0715111423, author = M Lato,
title = Probabilistic Rock Fall Assessment: Accounting for the Effects of Engineered Mitigation,
year = 2016
}