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Norway TBMs' Hard Rock Concert -
A $3.4-billion high-speed railroad tunnel to Oslo.
Norway's Bane NOR's engineers had an enormous challenge. Hard abrasive rock and a lot of water! And an Italian contractor in financial difficulties running project late for months and over budget.
To TBM or Drill and Blast? How was the decision making process?
Read all about it in this ENR article. It is a treat!
https://www.enr.com/articles/47369-norway-tbms-hard-rock-concert
Pleasure to read but in retrospect would Norwegians still choose TBM?
When I was visited Bergen (on the same day the WTC 2017 started) I met a respected Norwegian professor on the street just by coincidence. He told me that the operation of TBMs was very costly. The rocks were eating disc cutters like rubber.
cover tunnel photo by: Matt Brown from London, England / CC BY
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Herrenknecht TBMs performed well in this project. Choosing TBMs was the right decision.