FEASIBILITY OF MODELING CAVITY BEHAVIOR IN JOINTED ROCK MASSES.
Contract rept. (Final).
NEWMARK HANSEN AND ASSOCIATES URBANA ILL
Pagination or Media Count:
The general scaling relationships for nuclear effects are reviewed. For a spherically symmetric wave which approximates a measured velocity pulse at a given radius, calculations are made to compare the effects at other radii with the measured values. A discussion of the general modeling theory is followed by a discussion of the feasibility of modeling large openings in jointed media both in the laboratory and in the field. It is concluded that model tests in the field are preferred, though certain types of studies in the laboratory will be meaningful if accompanied by field studies. Application of the Hard Hat data to the design of larger openings is discussed. The destressed zone around openings in rock is described and the effect of certain parameters is studied. Consideration is given to the mechanism of rock failure at the cavity walls. The feasibility of studying free field stress wave propagation and structural interaction by using lumped parameter systems is considered. Two types of lumped parameter models now in use are described and extensions of recent work are suggested. Further work is recommended which involves field, laboratory, and theoretical studies. Author
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