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  The influence of scale and loading rate on the crack damage thresholds of Cobourg limestone with respect to Deep Geological Repository (DGR) tunnel design

  A study is ongoing in preparation for site selection analysis of future high level nuclear waste Deep Geological Repository (DGR) development in Canada. As part of this work, the effects of specimen scale and loading rate, in combination with saturation condition, have been investigated for the geomechanical properties of Cobourg limestone. The results show that there is no significant relationship between increased specimen diameter and Crack Initiation (CI) threshold, with minor influences on the Uniaxial Compressive Strength (UCS) and Critical Damage (CD) thresholds of Cobourg limestone. The effect of increasing loading rate has shown to decrease UCS and CD, with no noticeable change in CI, for room relative humidity specimens. The one month saturated specimens have shown an opposing trend, producing increased UCS and CD with increasing loading rate. The CI threshold for saturated specimens remains constant throughout the tested loading rate range.

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