why tunnal is round shape
2006-12-12 21:45:43 · 7 answers · asked by xxxxxxx x 1 in Science & Mathematics ➔ Earth Sciences & Geology
Tunnels are round because the round shape supports the weight of the rocks above better.
2006-12-12 21:52:35 · answer #1 · answered by ? 4 · 0⤊ 0⤋
Any force applied to a perfectly round shape is distributed evenly throughout the entire surface of the circle.
The better picture the distribution of weight on a piece of paper draw two concentric circles (same center different radius), these will represent the tunnel walls.
Now draw lines through he circles and passing through the center to divide the walls into slices. If you push a single piece of the wall you will notice that it can't pass through into the interior without first displacing the pieces on either side, and those can't move without first displacing the pieces on their sides, and so on.
So the force applied is evenly distributed around the entire circle, in order for it to collapse enough force would have to be applied so that after distributing the force enough pressure remains to cause a section to fail.
2006-12-14 13:24:36 · answer #2 · answered by Brian K² 6 · 0⤊ 0⤋
It's the easiest shape to bore.
2006-12-13 05:48:29 · answer #3 · answered by Anonymous · 0⤊ 1⤋
the arch shape is the strogest in the way it distributes the force pushing down on it
2006-12-13 05:51:12 · answer #4 · answered by Leash 2 · 0⤊ 1⤋
They are easiest to bore.
2006-12-13 06:42:38 · answer #5 · answered by winona e 5 · 0⤊ 1⤋
all the above, except the first one, dont know what it meant
2006-12-13 05:54:22 · answer #6 · answered by haat 5 · 0⤊ 1⤋
not easily breakable
2006-12-13 05:55:42 · answer #7 · answered by grefriend 2 · 0⤊ 0⤋