ABSTRACT
Canadian deep hard-rock mines, which are progressing to depths greater than 2.5 km, provide in situ laboratories for improving understanding of rock mass damage and failure processes around underground openings; collecting data to assess in situ and induced stress variability (e.g., core disking, borehole breakouts, stress measurements); collecting structural data from boreholes and drift walls for characterization of the rock mass and fabric; measuring fault occurrence, characteristics and displacement; and assessing the performance of ground support in burst-prone areas.
