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Abstract: Years of experience and multiple projects have shown that TBMs can handle all sorts of karstic conditions if the situation is identified at an early stage of the project and the TBM is designed for the conditions . The major problems related to karst occur when the conditions are either not identified at an early stage of the project or are not detected under the operation until it is too late...
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),...