Abstract
Tunnel design methods should consider the stress reduction occurring before the installation of a liner in some way. An estimate of the ground displacements can lead to an evaluation of the stress release because the stress release is closely related to the ground displacements. Various authors have suggested various stress reduction factors. A reliable method for determining the stress reduction factors was proposed in this study. The values of the stress reduction factors for different soil strengths, tunnel depths, and in-situ stress ratios were presented as tables. In order to verify the accuracy of the proposed method, calculated stress reduction factors are applied for the actual tunnels and compared with field measurements. The method is strictly valid for stable ground due to the assumption of linear elastic ground and an unlined opening for the finding of the stress release factor. (A) This paper was presented at Safety in the underground space - Proceedings of the ITA-AITES 2006 World Tunnel Congress and the 32nd ITA General Assembly, Seoul, Korea, 22-27 April 2006. For the covering abstract see ITRD E129148. Reprinted with permission from Elsevier.
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