bodhi at Fri, 8 Mar 2024 03:22:39 UTC No. 16062220

>>16062215
they all have the same amount of force acting on them

Anonymous at Fri, 8 Mar 2024 03:25:21 UTC No. 16062223

Triangle tunnels last longer.

Anonymous at Fri, 8 Mar 2024 03:31:15 UTC No. 16062232

>>16062215
if we assume the floor is always perpendicular to the force of gravity, then I would say 1

Anonymous at Fri, 8 Mar 2024 03:37:02 UTC No. 16062243

>>16062215
>which tunnel is more structurally safe
Depends entirely on local conditions. Engineering is a clusterfuck, especially in the ground.
>and will last longer
3 creates the largest void and will therefore take the longest to be filled by the elements.
>easier to make etc.
Depends on what you're using to make it. Boring machines dig circular holes, so I'd imagine making 1 or 2 would be a bit of a bitch. If you aren't using specialized machinery, then 1.

Anonymous at Fri, 8 Mar 2024 04:24:26 UTC No. 16062292

>>16062215
Dont know about tunnels but domes for houses are stronger when shaped like a catenary, when they only have to deal with their own shape, assuming they have a constant thickness

Anonymous at Fri, 8 Mar 2024 04:27:54 UTC No. 16062296

>>16062215
If you model the soil pressure like it was a liquid, the ideal shape would be a sphere
If you think there will be more vertical pressure and less horizontal, because soil and rocks are not a liquid, then the ideal shape would be more like a vertical oval

Anonymous at Fri, 8 Mar 2024 04:47:06 UTC No. 16062318

In practice, if you're digging a tunnel by hand it will always tend to make an arched top but have straight vertical sides. It's just the most efficient shape to dig that can still fit a human through. A lot of people start digging with a nice shape or size in mind, but it's such hard work that everybody ends up converging on the laziest solution.

Anonymous at Fri, 8 Mar 2024 04:48:20 UTC No. 16062321

If we assume they're in a vacuum then 1 is the safest, 3 will last the longest, and 1 is easiest to make.

Anonymous at Fri, 8 Mar 2024 10:30:30 UTC No. 16062610

>>16062215
1

Anonymous at Fri, 8 Mar 2024 10:57:58 UTC No. 16062631

>>16062321
how do you dig a tunnel in a vacuum?

Anonymous at Fri, 8 Mar 2024 11:00:46 UTC No. 16062633

>>16062631
Nobody said dig. Anyway, I would recommend cold welding.

Anonymous at Fri, 8 Mar 2024 11:02:19 UTC No. 16062634

>>16062631
>how do you dig a tunnel in a vacuum?
Use a dust bunny.