Time-Dependent Compressive Strength of Rock Containing Cracks Artificially Induced by Heating

摘要

The investigation of time-dependent strength of rock containing cracks is considered important in designing underground structures required to remain stable for long term. Hence, rock specimens containing cracks (fractured rock) artificially induced by heating procedure were at first prepared in this study. Then, the time-dependent behavior in such rock specimens under uniaxial compressive stresses was examined in both dry and water saturated conditions.As a result, it was shown that the strength of closely fractured rocks depends on the loading rate irrespective of the kind of rock or dry and wet conditions, and also that the loading rate U is related to the impulse I to the failure as given in the equation (2). Finally, it was confirmed that the micro-structure model proposed by Kemeny can be applicable to even fractured rocks.