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One option might be to construct the "wall" out of a mountain range. No doubt it would not be monolythic, but one might use a mix of carved stone and concrete, with the fill materials recovered from the carving the mountains. Is the wall one sided, or two sided?Perhaps your project would share a lot with dam construction, some are in the range of 300M tall.Wind would certainly be an issue as one wouldn't want the whole wall to blow over.The St. Louis Arch is built out of welded stainless steel panels, I believe with the panels themselves providing the support structure for the arch. I could imagine building a wall out of solid stainless steel panels. One might choose some kind of a honeycomb design to provide adequate cross linking.Stainless, or even thick mild steel, would provide an excellent facing for a concrete & earthen structure.WATER may be an issue. If one chose the continental divide (Rocky Mountains in the USA) for building the wall, then one could plan it to have no water penetrations. Otherwise, there might be a need for rivers to flow trough or under the wall, perhaps through a tunnel.
Strength is measured in units of pressure. How much pressure is needed to crush it? The pressure at a given height is equal to the weight of what's above that height divided by the cross section area. Each layer must support the weight of everything above it, so the bottom must be thickest.
Wouldn't a carbon wall be the most durable and resilient? I believe hearing somewhere that its melting point is near 3,500 degrees C.
Does diamond burn very well?
Does diamond burn very well?Carbon Fiber is typically a resin composite, much like fiberglass. Certainly fiberglass burns quite well, and many resin composites would also burn quite well. A carbon fiber wall may be a good channel for lightening too.I think the idea with carbon nanotubes is to weave a yarn with them, and perhaps make ropes and cables without added resin. However, currently the individual fiber lengths are short, and woven cables with short nanotubes tend to be relatively weak.
Maybe add an aerogel outer coat for the final product?
For any combination you suggest, I can think of a way through.