New theory of rock fracture based on interaction between pre-existing

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Using specimen models of monomineral polycrystalline rock created on a computer, we performed both analysis of uniaxial tensile fracture and estimation of rock damage due to the viscoelastic behavior of grain boundaries during stress relief. In the former, we have clarified fracture mechanisms such that the conversion of failure mode from tension to shear always occurs during the completion of the final failure plane. In the latter, it has been shown that there is a stress region for which both the magnitudes and directions of the principal stresses can be accurately estimated by DSCA and this region becomes wider as the depth increases. Thus, we can now approach to the construction of a new theory of rock fracture by extending stress conditions.