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List of products by author: D. Brox
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Lessons Learned for TBM Tunneling in the Georgian Bay Formation
Abstract: The Georgian Bay formation comprises a shale bedrock formation that is present across southern Ontario, including along the shores of Lake Ontario, where over 30 kilometers of infrastructure tunnels have been constructed. The Georgian Bay Formation is associated with some unique geological and geotechnical conditions that are relevant in order to understand the risks associated with tunnel...
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Melamchi Water Supply Tunnel Phase 1 Design and Construction Challenges
Abstract: The Phase 1 Melamchi Water Supply Tunnel is a 26 km, 4 m size tunnel that comprises the main component of a new water supply project to provide 2.8 m3/s of treated raw water for the city of Kathmandu, Nepal under full flow pressure conditions of 26 m of maximum head. The inlet and outlet of the tunnel are located about 40 km and 20 km northeast of Kathmandu respectively. The inlet headworks for...
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TBM Risk Assessment and Selection for Hydropower Tunnels
Abstract: TBMs are increasingly being used for the construction of long and deep hydropower tunnels given the well-recognized higher rates of production advance that allow for early completion and the economic benefits for an early project start-up. The assessment and selection of the most appropriate type of TBM to be used should be mainly based on a comprehensive technical evaluation of all...
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The return of TBMs to Norway at Røssåga HEPP – TBM operation through extremely hard rock, unstable rock mass and...
Abstract: The breakthrough of the TBM at the Røssåga HEPP on 10 December 2015 signaled that the first TBM breakthrough in Norway in more than 20 years was a fact. The Robbins TBM was delivered as an Onsite first time assembly (OFTA) in January 2013 and was ready to bore less than 11 months from when the contract was awarded. During the excavation the TBM encountered extremely hard rock (over 280 MPa),...
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