Stabilization of Rail Track Bed Mile 9.0 – 9.1, CN, Dundas Subdivision

Colin Alston, Mario Ruel

In the proceedings of: GeoSt. John's 2019: 72nd Canadian Geotechnical Conference

Session: Transportation Geotechnics

ABSTRACT: A single-e to some clay in the base of the rail cutting which extends to a depth of about 3 m below the base of rail, where it is underlain by a layer of sand. The phreatic pressure in the sand layer was up to about 4 m above the rail track. The sandy silt layer which lies at the base of the cutting has behaved as an aquitard confining the pressure in the underlying sand layer. Breakouts of pressurized groundwater have randomly occurred in the cutting base; upward seepage through the silt has which in turn resulted in track instability. Such instability required the imposition of severe slow orders on train movements and a 24 hour-a-day watch. Track stabilization has been carried out in three phases over a period of 23 years. The first two phases were regarded as temporary and were intended to reduce the severity of slow orders until a permanent solution to the instability could be implemented. Both of the initial phases involved the removal of the then existing rail track and track bed, and construction of a new bed which incorporated a variety of geosynthetic reinforcing. The designs provided satisfactory support to carry a fully loaded train across a 0.5 m diameter void. The third phase of stabilization was designed to provide a long-term solution to the track instability by permanently reducing the phreatic pressure such that breakouts of groundwater would no longer occur. All of the applied corrective measures have been successful within their design expectations.

RÉSUMÉ: années 1850, et une deuxième voie a été ajoutée au nord de la première dans les années 1890. Le profil du sol se La pression phréatique dans la couche de sable atteignait environ 4 m au-dessus de la voie ferrée. La couche de limon sable sous-ion se sont produites aléatoirement dans le fond de la e la surveillance 24 heures par jour. La stabilisation de la voie a été réalisée en trois phases sur une période de 23 ans. Les deux premières phases ont été solution définit--forme qui comprenait divers renforts géosynthétiques. Les conceptions ont fourni un supvoie ferrée en réduisant de façon permanente mesures correctives appliquées ont donné les résultats escomptés.

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Cite this article:
Colin Alston; Mario Ruel (2019) Stabilization of Rail Track Bed Mile 9.0 – 9.1, CN, Dundas Subdivision in GEO2019. Ottawa, Ontario: Canadian Geotechnical Society.

@article{Geo2019Paper241,author = Colin Alston; Mario Ruel,title = Stabilization of Rail Track Bed Mile 9.0 – 9.1, CN, Dundas Subdivision,year = 2019}