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Jul 11 at 15:19 comment added user1937198 If your worried about what can be done without disturbing existing tunneling, look at some of the projects done in London as part of the Thameslink and Elizabeth line (previously crossrail) projects, where very limited surface level space was available, and they were building interconnections into existing deep tunneled stations.
Jul 11 at 14:46 comment added Valentin Onishchuk @Mon , interesting idea, will consider it too.
Jul 11 at 5:58 comment added Mon For example if a descending spiral road bed was built around the outer circumference of the bunker when it was first constructed and this road goes right down to the lowest level & ends in a blank concrete wall? You can just cut though that wall and continue the spiral downwards as far as you need to go. Every new level can then be excavated laterally off the spiral at the right depth below the levels above it. All the excavation waste is transported up and out via the spiral while all construction materials etc are trucked down and in the same way.
Jul 11 at 5:52 comment added Mon It would also help greatly if the original bunker system was also designed with the possibility of further expansion in mind. That way ease of access for mining equipment equipment, structural reinforcement of the lower levels and possible future power and utility requirements etc would be engineered into the original design making any expansion later on a LOT easier. CONTINUED BELOW
Jul 10 at 19:40 comment added Adam For two very different examples take a look at the New York City Subway system (old and new parts), and the tunnels built in Gaza. Both are relatively recent and under existing construction.
Jul 8 at 17:54 vote accept Valentin Onishchuk
Jul 8 at 17:47 comment added Nepene Nep Yes, so long as your tunnels are stable, the above floors will be fine. Concrete is very stable, and you can regularly check it for cracks and replace it if needed.
Jul 8 at 17:00 comment added Valentin Onishchuk Thanks. I'm more worried about collapsing, as noise from drilling equipment can be plausibly mitigated. So, imagine, if I have already 6 floors with a 3 meters of height each one (not counting height of space between each floor) - I can start safely build 7th floor and etcetera as long, as new tunnels are being reinforced? And once all digged up areas are reinforced - I can start building concrete-steel walls and connect this area to existing elevators and stairs?
Jul 8 at 16:49 history answered Nepene Nep CC BY-SA 4.0