3 ms·
> Tunnels digging costs are roughly proportional to the square of their diameter Given a constant length and homogeneous ground composition (conditions that ap
by pygy_ 9y ago
> Tunnels digging costs are roughly proportional to the square of their diameter
Given a constant length and homogeneous ground composition (conditions that apply to the current discussion)... It makes a lot of sense that the cost is proportional to the volume being removed.
- mulmen 9y agoThere has to be more to it than just homogenous ground composition. Surely drilling into granite is harder than clay or something? Also my understanding was that the SR99 tunnel is through both fill and clay. http://www.wsdot.wa.gov/Projects/Viaduct/About/Tunneling http://www.wsdot.wa.gov/Projects/Viaduct/About/Tunneling
- pygy_ 9y agoI may not have used the best phrasing: For a given tunnel length and ground composition, the cost is proportional to the area of the cross section.