Based on the fact that rock fractures are usually three-dimensional,the dimensionless stress intensity factors(i.e. YI and YⅡ) of mode I and mode Ⅱ and the dimensionless T-stress of the single edge notched deep beam(SENDB) specimen were calibrated using 3 D numerical models,and compared with the results obtained with 2 D numerical models from a reference. The 2 D models usually provide the low values for SIFs and T* than the 3 D models. Accordingly,the fracture toughness calculated with a 2 D model was lowe...
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