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  Challenges in characterization of complex rockmasses, using drillcore, as input into geomechanical analysis for tunnel design

  Rockmass characterization is an essential component of geotechnical design for tunnels and other underground excavations. The nature of data collected for conventional geotechnical characterization of drill core is often directed by inputs for empirical rockmass classification systems, but advanced numerical models require more sophisticated data for geotechnical designs in complex rockmasses. In an effort to advance rockmass characterization practices for complex rockmasses, the authors have developed and tested several new core logging procedures that account for healed structures (e.g. veins, stockwork, healed fractures) that occur in such rockmasses. Hybrid Continuum/Discontinuum Finite Element models of a circular tunnel example were used to compare the effect of data inputs from each core logging method on the resulting rockmass behaviour. The models that are based on more detailed core logs reveal increased rockmass failure.

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