Abstract: An understanding of the characteristics and areas of the excavation damage zone plays an important role in stability assessment and support design. In this study, we presented the definitions and criteria for the three excavation damage zones in terms of failure, open and shear zones, as well as the discrete element method for simulating the excavation damage zone in fractured rocks based on the Barton-Bandis fracture constitutive model. We built a discrete fracture network model for the 4# diversion tunnel excavated in columnar jointed rocks at the Baihetan Hydropower Station, and the agreement of the depth of the excavation damage zone between numerical modeling and the field monitoring demonstrates that the proposed discrete element method for simulating the excavation damage zone in fractured rocks was an accurate and robust modeling tool. Considering the random distribution of JRC(Joint Roughness Coefficient)in fractured rock mass, the area of the excavation damage zone decreases with the increasing JRC average, and the depth of the excavation damage zone high probabilities increased with the increasing standard deviation of JRC distribution.
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