The Problem of Induced 'Block Motion' Related to Deep Underground Strategic Facilities - A Summary.
Topical rept. Jun 75-Oct 76,
R AND D ASSOCIATES MARINA DEL REY CALIF
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The block motion problem of explosion-induced differential displacement along geologic discontinuities must be better understood to adequately design and site underground strategic facilities that would survive wartime threats. The purpose of this investigation is to review pertinent literature, develop concepts addressing current understanding of explosion-induced block motions, and identify research that could quantify risks for particular sites. The block motion problem is concerned both with those motions driven or dominated by the explosion-induced stress transients and with those motions triggered by the explosions but dominated by the partial relief of pre-stress conditions. Emphasis is given to the problem of triggered motions because this is the aspect of greatest uncertainty and because the limited evidence is suggestive that differential slip can be triggered at considerable distance from the explosion, depending greatly upon in-situ stress conditions. Methods for avoiding, relieving, absorbing, and resisting explosion-induced block motions are addressed and it is concluded that quantifying the block motion problem appears difficult but not hopeless.
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