PROJECT PROFILE Summary In the Kiamai tunnel in New Zealand a section of rail slab base had subsided up to 50mm overall, where the underlying rock beneath the rail slab base had been crushed by the overburden weight of the trains running over (40 ton minimum weight). Subsequently natural water ingress, with drains on either side of the track, had eroded away the rail base over time, leaving a large void, around 300mm deep, beneath the trac

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