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Abstract: For the Strindheim highway tunnel in Trondheim city, Norway, a novel solution was developed for the retainer walls. The 4-lane tunnel entrance in the densely built-up city had to cross through soft and partly quick clay by a 300 m long cut & cover section. The challenge was to provide safe, 20 m deep open pit without draining nor disturbing the extremely “brittle” quick clay and save as...