3D DATA COLLECTION FOR RAPID ROCK FALL RESPONSE SITUATIONS

Matt Lato, Dave Gauthier, Pete Quinn, Jean Hutchinson, Ryan Kromer, Tom Edwards, Jose Riopel

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

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

ABSTRACT: Linear infrastructure corridors in rugged terrain are typically vulnerable to rockfall and rockslide type natural hazards. Once a hazardous event has occurred that warrants investigation in relation to the safety of the site it is critical to collect detailed information quickly. The Railway Ground Hazard Research Program has invested in the development of remote sensing techniques that can be deployed in a rapid response scenario. Oblique Helicopter Photogrammetry (OHP) is a technique that enables the generation of 3-dimensional (3D) point cloud data from photos using Structure from Motion (SfM) photogrammetry. This paper discusses two case studies in which the operator of a single track railway line experienced a rockslide event that required an immediate engineering response. The first site is located along a QNS&L railway line 20 km north of Sept-Iles, QC where a rockslide covered the tracks and forced the temporary closure of the railway. The second case study is located along a CN railway line 150 km northeast of Vancouver, BC where a rockslide activated a slide detector fence. An immediate response was undertaken by both railways. In both instances the time between data collection and initial model development was less than 24 hours.

RÉSUMÉ: événement dangereux, qui demande une investigation en lien avec la sécurité, survient, il est essentiel de récolter les informations rapidement. Le Railway Ground Hazard Research Program a investi dans le développement de techniques de télédétection qui peuvent être déployées dans un scénario génération de données sous forme de nuages de points tridimensionnels (3D) à partir des photos et de la méthode de première étud-est de Vancouver, en Colombie-de fer QNS&L à 20 km au nord de Sept-îles, Qc, où un glissement rocheux a couvert les rails et forcé la fermeture temporaire de la voie ferrée. Une réponse immédiate a été entreprise par les deux opérateurs. Dans les deux cas le

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