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  Rehabilitation of Mont-Royal Tunnel

  The Mont-Royal Tunnel (MRT) is a railway tunnel located in Montreal, Canada. This 100-year-old double track tunnel connects Downtown Montreal to the north side of the Island of Montreal by passing through Mount Royal mountain. The tunnel is approximately 5 km long, 9.6 m wide and 4.4 m high, with a constant 0.6% grade. The tunnel was bored through different types of ground, varied from hard rock to soft soil. In response to different geological characteristics of the surrounding ground, varied tunnel cross sections and excavation methods were adopted for construction of this tunnel. This existing double track horseshoe tunnel will be used by the new Montreal light rail transit network, Réseau Express Métropolitain (REM). This electric and fully automated LRT network will facilitate mobility across the Greater Montreal Region by providing 67 km of twin tracks and 26 stations. In order to use MRT in a modern transit system, the tunnel needed to be inspected, rehabilitated and be compliant to the recent safety standards. This paper presents the details of the structural inspection and rehabilitation of the tunnel. Further, the paper presents the repair methods proposed based on the results of this inspection and evaluation.

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