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Old 06-08-2018, 07:08 PM   #1058
Joel N. Weber II
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Join Date: Aug 2015
Posts: 551
Re: North-South Rail Link

They also said something about minimum tunnel depth to avoid surface disruption being a function of tunnel diameter; I think it may have been a requirement to go two tunnel diameters down. I'm not sure if that's two tunnel diameters from the top of the tunnel to the bottom of the existing utilities, or something else.

Alon Levy has been simultaneously arguing for very large diameter tunnels that can accommodate two tracks in a single tunnel bore, while also complaining about the inconvenient access to deep tunnels, and it sounds like if we want to minimize the depth, perhaps we should be choosing a single track per tunnel bore.
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