depth
depth
(OP)
At what depth would a tunnel/shaft colapse if say their were no cracks and was solid rock? (a 25 meter diamiter shaft/tunnel)
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RE: depth
RE: depth
This of course excludes several other very important factors including the extent of fracturing, which is typically the most critical factor in the stability of underground excavations, horizontal stress magnitude, orientation of tunnel relative to principal stress directions, groundwater, and ground support.