Reply to post: Re: High Lithostatic pressure making it hot.

Swiss effectively disappear Alps: World's largest tunnel opens

Roland6 Silver badge

Re: High Lithostatic pressure making it hot.

"I also heard that they had to take special engineering account of the pressure induced weight of all that rock above"

"The softer rock threatened to deform the tunnel, so engineers had to develop a new concept for tunnel engineering - flexible steel ribs that were anchored into the tunnel walls and then lined with concrete to absorb the rock pressure and protect the integrity of the tunnel. It was the first time so-called tunnel-lining machines were used in railway tunnel construction."

[http://eandt.theiet.org/magazine/2015/10/gotthard-base-tunnel.cfm ]

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