Abstract
During the construction of New Yungchuen Tunnel, a major water inflow was encountered and the advance was abandoned. Further advances were attempted and again abandoned. Following detailed investigations, the problem area was determined as a very voided marble layer. The paper describes the use of hot bituminous grouting followed by cement and chemical grouting to both reduce the water inflow to acceptable volumes and pressures and also to reduce the convergence. In addition, the design of the tunnel was changed to include the construction of a larger circular tunnel through which the general horse-shoe shaped tunnel would subsequently pass.
Résumé
Pendant la construction du tunnel de New Yungchuen, une venue d’eau importante a été rencontrée et le creusement dut être abandonné. De nouvelles reprises de creusement ont été tentées et à nouveau abandonnées. Après des investigations détaillées, la zone problématique a été identifiée comme un niveau de marbre comportant des vides importants. L’article décrit l’utilisation de produits d’injection bitumineux chauds suivis par l’injection de coulis de ciment et de produits chimiques à la fois pour réduire les venues d’eau et les pressions et aussi pour diminuer la convergence. De plus, la conception du tunnel a été modifiée avec pour objectif de construire un tunnel circulaire plus grand au travers duquel le tunnel de section en fer à cheval pourrait ensuite s’insérer.
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Acknowledgments
The authors acknowledge the contribution of Prof. Ming-Lang Lin in completion of the work. They also thank the National Science Committee, Taiwan, for financial support of this research under Contract Nos. NSC 95-2218-E-027-021 and NSC 98-3114-E-002-013.
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Wang, TT., Jeng, FS. & Lo, W. Mitigating large water ingresses into the New Yungchuen Tunnel, Taiwan. Bull Eng Geol Environ 70, 173–186 (2011). https://doi.org/10.1007/s10064-010-0311-1
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DOI: https://doi.org/10.1007/s10064-010-0311-1