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  Behavioral uncertainty for rock tunnels: Implications for rockmass definitions or predictions in geotechnical baseline reports

  On North American tunneling projects, uncertainty surrounding the expected ground conditions presented in the geotechnical baseline report (GBR) often results in conservative GBRs or an abundance of contractor differing site condition (DSC) claims. Rockmass behavior in GBRs is typically presented with rockmass classification systems or with a number of rockmass behavior classes. This paper presents a new approach to present the expected ground conditions in a GBR where the range of rockmass behavior is plotted as a composite result of the critical geomechanics parameters. This representation then allows the expected behavioral likelihood to be assessed as a function of uncertainty in these key parameters. As this approach incorporates a greater range of rockmass behavior, as well as transitions and combinations of different rockmass behaviors, it is likely to reduce the possibility of a DSC claim. However, there are several questions which require further industry discussion before this method can be incorporated into the current state of practice.

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