3 ms·
Well the area of a circular tunnel is proportial to the square of the diameter. Perhaps a lower area allows the bore to tunnel faster? That kinda makes sense, b
by infogulch 8y ago
Well the area of a circular tunnel is proportial to the square of the diameter. Perhaps a lower area allows the bore to tunnel faster? That kinda makes sense, but I have no idea how much the area of a circle relates to tunnel boring in reality, if at all.
- mcguire 8y agoThe tunnel boring machine would likely cost much more, for a larger tunnel, but it's fixed relative to the length and a capital expenditure, much of which can be recovered or re-used. The amount of material moved would be proportional to the area of the tunnel, but I can't see that as a major cost factor. A larger machine would need more lining material, and more workers... And it still doesn't address the terminals.