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The conditions of homogeneity and isotropy generally assumed in theoretical analyses of stress distribution and strength parameters are rarely realized in rocks. Most rocks are anisotropic at least, and very commonly discontinuous. The flow of stress through discontinuous material differs greatly from that in isotropic, continuous materials. The influence of anisotropies is the greatest when confining stresses are at minimum; it is no wonder, then, that they become the primary concern in relatively shallow depth operations of mining and civil engineering projects.

Structural Model Tests to Investigate Fracture Propagation in Discontinuous Rocks