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> Sometimes, the soil is loose, making it impossible to dig deep to build underground parkings (or subways, for that matter) Not impossible. Amsterdam is built
by Someone 5y ago
> Sometimes, the soil is loose, making it impossible to dig deep to build underground parkings (or subways, for that matter)
Not impossible. Amsterdam is built on peat, but has plenty of underground parkings and a subway. Google gave me https://en.wikipedia.org/wiki/De_Pijp_metro_station https://en.wikipedia.org/wiki/De_Pijp_metro_station, which says “The lower level platform with southbound services to Zuid is 26.5 meters below street level”. That puts it way below sea level.
That tunnel was bored, but parking garages (and home cellars) get dug out (typically, before digging starts, walls to prevent cave-ins are pushed into the ground and water pumps are started)
- hetspookjee 5y agoMind you that despite all best efforts and experts involved this project went trice over its head. I am very happy with the end result though
- Someone 5y agoI don’t think that’s unique for construction of tunnels in loose ground. Such projects typically go over budget because one offs are hard to cost estimate, and politically, you can’t sell a project that will cost, say “between $X and 5 × $X billion”. Saying “X billion” is a way easier sell a project.