Hofstad tunnel excavation
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Hofstadtunnelen is situated under Melhus municipality, Trondheim. Tunnel was constructed back in 2003 to allow free traffic flow of a intercity highway called E6 by allowing two local roads passing over it. Plan is to upgrade highway (E6) underMelhus municipality from 2 lane to 4 lane highway to increase its capacity. Proposal is to construct a second tunnel right next to the old tunnel. Due to surrounding landscape both tunnels need to be in close proximity. Tomake room for the new tunnel construction, it requires partial excavation of the old tunnel. Excavation need to be performed along its long axis. In this report, process of this excavation is analysed from a geotechnical point of view. Plaxis software is used as analysis tool. Currently project is in designing phase.