13th International Conference on Fracture June 16–21, 2013, Beijing, China -8- Figure 8. Comparison between eroded and non-eroded disc cutters for the Mode I and Mode II stress intensity factors, KI, KII (MPa m1/2 ) versus different S/Pd ratios Figure 9. Comparison between eroded disc cutter and non-eroded disc cutters for the Mode I and Mode II stress intensity factors, KI, KII (MPa m1/2 ) for various penetration depths Pd 5. Conclusions A two-dimensional code based on a semi-infinite displacement discontinuity method (Known as HOSDD2D) is used to simulate rock-cutting behavior under TBM disc cutter during rock indentation. The produced micro cracks under the disc cutters are coalesced during their propagation into the
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