Abstract
The article discusses the rail tunnel project at Grauholz near Bern where construction methods are challenging tunnelling conventions. In this construction project use is being made of the largest Mixshield yet made, at 11.6m O/D, which is to be converted from a bentonite slurry shield to a non-pressurised disc cutting machine and back again during the course of its 5.5km long drive, to avoid dewatering operations in an environmentally sensitive area. As the TBM advances the tunnel surface is lined with precast concrete segments and the invert is backspilled to provide the permanent foundation for the railway track. (Author/TRRL)
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