Erarslan, N. and Williams, D. J. (2010). Mixed mode (Mode I-II) fracturing of rocks. In: Hossain Md. Shahin, Dorival M. Pedroso, Feng Zhang and Atsushi Yashima, New Frontiers in Computational Geotechnics. 5th International Workshop on New Frontiers in Computational Geotechnics NFCOMGEO V, Brisbane, Australia, (151-154). 26-27 July 2010.
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A major challenge in rock fracture mechanics research at its current stage of development is the extrapolation of parameter values measured at laboratory-scale on small, intact rock specimens to large-scale jointed rock masses. Understanding crack growth is therefore very important for assessing the stability of rock masses/materials and for the sage design of structures within rock masses. This study includes dametrical compression tests on inclined Cracked Chevron Notched Brazilian Disc (CCNBD) specimens tested at different loading angles. The experimental results are compared with numerical simulation results obtained using FRANC2D. It was found that notch cracks at the centre of CCNBD specimens opened (Mode I) up to a crack inclination angle (β) of 28°, while crack closure (Mode II) occurred after β = 33°, with closure becoming more pronounced at higher crack inclinations of 45° and 70°. Both experimental and numerical results showed that the crack initiation angle (Ø) is a function of the crack inclination angle (β).