Numerical Modeling of S-Wave Generation by Fracture Damage in Underground Nuclear Explosions

摘要: Abstract : The quasi-static micromechanical damage mechanics originally formulated by Ashby and Sammis (PAGEOPH, 1990) has been expanded in three important ways: (1) An energy density function derived that allows a self-consistent inclusion of the effects dynamic evolution on elastic anelastic response. (2) whereas Ashby/Sammis model was only applicable to case where initial cracks are all parallel same size, we can now include specified distribution crack sizes with random azimuthal orientation about loading axis, (3) allow for yielding weaker minerals granite at relatively low stress levels which produce strong nonlinearity failure envelope stress-strain curve. This new is validated using published experimental data Westerly granite. In collaboration group U.C. Santa Barbara, have built our into commercial finite element program ABAQUS used it simulate an explosion damaged rock. We find pre-stressed medium or one contains anisotropic generates S-wave radiation agreement previous simpler calculations Johnson (PAGEOPH. 2001) observations photoelastic plates.