Good Day /k/ I have an abstract question today for all of you. I am looking for someone who was an Engineer for the military or a Miner/Architect.

I would like to know the load baring strength of underground tunnels and rooms, nothing big, the tunnels would be about 6.5 feet high and about 4-6 feet wide, and the rooms would be roughly 8-10 feet high, 10-15 feet wide and about 40 feet long. What are good rescources to read up on to aquire tips on tunneling and re-enforcement of said rooms and tunnels.