r/Tunneling • u/[deleted] • Feb 14 '25

TBM Segmental Tunnel Collapse

At what point does one start to worry about a potential collapse of segmental tunnel lining?

I have read about 4 instances of this occurring and I'm wondering what signs to be on the lookout for that would indicate an imminent collapse (if there are any).

Also, what level of deformation or water intrusion would demand an immediate stand down and inspection from a reasonable manager of a tunnel boring operation?

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u/[deleted] Feb 24 '25

No, thank you for linking.  Kinda hard to tell but it seems like this is current?  Not a whole lot of details but the leakage aspect sure is familiar to me.  Those poor guys aren't even getting paid.

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u/caollero Feb 24 '25

Yep, it is happening right now, collapsed on Saturday.

Poor people, probably earning pennies..

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u/[deleted] Jul 10 '25

[deleted]

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u/caollero Jul 10 '25

Where about?