2024-12-06 09:48:55
The amount of dirt to be removed scales with area of the tunnel: ((diameter/2)^2*Pi). To calculate: (6^2*Pi) / (14^2*Pi)=0.183. So the smaller tunnel actually needs 81.7% less dirt to remove. [Link] NEEDS_MORE_RATINGS(7-0-1) Author
2024-12-06 19:57:08
"Traditional" metro tunnels, such as the historic lines in London, have tunnel diameters smaller than 12 feet. "The Bakerloo, Central, Jubilee, Northern, Piccadilly, Victoria and Waterloo & City lines [...] run in circular tunnels with a diameter of about 11 ft 8 in." [Link] NEEDS_MORE_RATINGS(3-1-1) Author