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From concept to reality, combining a rockfall barrier with a retaining wall to protect railway tracks

Andi D Buechi, Edward Wu, Darren Wiebe

In the proceedings of: GeoEdmonton 2018: 71st Canadian Geotechnical Conference; 13th joint with IAH-CNC

Session: Geohazards in Linear Infrastructure

ABSTRACT: At a railyard in Hamilton, Ontario a slope needed to be cut and a retaining wall installed as part of the capacity improvement program. In addition to stabilizing the cut slope above the location of the proposed retaining wall a rockfall source area was identified. The hazard of rocks falling down the slope and over the retaining wall was very real. Canadian National Railway (CN) approached Geobrugg and inquired if there was any experience in combining rockfall protection with retaining walls. Geobrugg responded with conceptual level options to combine the retaining wall and a flexible rockfall barrier. A consultant performed a rockfall evaluation and determined a site specific rockfall energy and bounce height. With this Geobrugg provided the anticipated system forces on the posts that would occur during the design impact. The H-piles used in the soilder beam and lagging retaining wall were then dimensioned above the top of the wall grade to accommodate the rockfall barrier system. The retaining wall was constructed and a rockfall net system was provided and attached to the extended H-Piles. In areas where the retaining wall was no longer required, a traditional rigid post rockfall protection system was installed.

RÉSUMÉ: ainsi amont a été identifiée. Le risque de chutes de blocs et le dépassement de ces blocs par-dessus le mur de soutènement était très réel. CN s'est enquis près de Geobrugg à la recherche d'expérience pour ce genre de situation. Des options au niveau conceptuel pour combiner le mur de soutènement et une barrière flexible contre les chutes de pierres ont été proposées. Une énergie pour l'éboulement et des hauteurs de rebond ont été déterminées et Geobrugg fut en mesure de fournir, pour les poteaux, des estimations de force lors d'impacts de conception. Les poutres en H destinées à être utilisées pour le mur de soutènement ont été dimensionnés plus long que le mur même, afin d'accommoder le système de barrière flexible pare-pierre. Le mur de soutènement a été construit et un système de filets contre les chutes de pierres a été fourni et fixé aux poutres en H. Dans les zones où le mur de soutènement n'était plus nécessaire, un système traditionnel de protection contre les chutes de pierres a été installé sur 50 mètres supplémentaires à l'aide de poteaux rigides autonomes.

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Cite this article:
Andi D Buechi; Edward Wu; Darren Wiebe (2018) From concept to reality, combining a rockfall barrier with a retaining wall to protect railway tracks in GEO2018. Ottawa, Ontario: Canadian Geotechnical Society.

@article{geo2018Paper306, author = Andi D Buechi; Edward Wu; Darren Wiebe,
title = From concept to reality, combining a rockfall barrier with a retaining wall to protect railway tracks,
year = 2018
}