Abstract
In order to discuss the overall safety of a tunnel project, it is necessary to consider the reliability of a given length of the tunnel system rather than that at a cross-section. Since the failure pattern along a tunnel axis consists of failed and unfailed sections with varying lengths, a two-state availability model is introduced. Results show that the reliability of a tunnel system within one type of rock would depend upon the correlation characteristics of the ground along the tunnel axis and the reliability of a cross-section. The effect of alternating rock types along the tunnel axis upon the reliability of the tunnel system is also investigated.
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