Crack tensor-based evaluation of inada granite behavior due to damage under true-triaxial testing condition

Abstract

In the present work, wave velocity measurements were implemented to assess the state of damage in specimens of Inada granite. The specimens were first loaded under true-triaxial testing conditions for which different levels of major principal stress with respect to ultimate strength were applied. Christoffel's stiffness equation was used to derive elastic properties of the domain via P-wave velocity measurements. The compliance matrix arrays in the strain-stress relationship were then calculated in the most heterogeneous case which involved 21 constants. Furthermore, determination of second and fourth rank crack tensors enabled convenient judgment for the degree of anisotropy expected during permeability and dispersivity studies which are very important in environmental studies. It was found that while more attempt to model granitic rocks in their real form is useful, the orthorhombic symmetry assumption for the rock under study would eventually render best outcome for realistic simulation purposes of mechanical properties. Finally, areas of application for the proposed development are discussed and prospects of future work by the researchers are outlined.