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by the-dude
2577 days ago
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Are you sure about that? Because I have never heard about a tunnel project which has been 'upgraded' this way ever. And if I start to think about the practical problems, like breaking up part of the tunnel before widening it, it quickly seems like building a new one might be more efficient. |
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Here the are filling the tunnel and using a TBM. https://www.newcivilengineer.com/farnworth-tunnel-widening/1...
Widening an existing tunnel without interrupting traffic is still possible like: https://www.rocksoil.com/pdf/233_r.pdf. Though with increased costs.
However, this changes for under sea tunnels which are segments placed down and thus can’t really be widened.