Explosively produced fracture of oil shale. Progress report, April--June 1978

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Abstract
Substantial progress in the theoretical description of rock fracture has been achieved during the last quarter. Two approaches are under consideration. The first uses a continuum measure of damage based on a theory of plasticity using a nonassociated flow rule. The second is based on detailed modeling of crack statistics and crack physics and offers the possibiliy of ab initio prediction of particle size distribution and permeability. This approach is discussed in three sections of this report, presenting the effect of yielding on crack stability, a general theory of statistical crack mechanics, and a special case in which the crack distribution is a combination of an isotropic and a bedded distribution. Both approaches are being programmed for inclusion in the computer hydrodynamic programs, and preliminary calculations have been performed for planning, support, and evaluation of the LASL/Colony oil shale field tests.

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