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Experimental validation of core-based pre-stress evaluations in rock: a case study of Changchikeng sandstone in the Tseng-wen reservoir transbasin water tunnel

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Abstract

The Tseng-wen reservoir transbasin water tunnel project is being excavated in the Changchikeng sandstone in Taiwan, at a depth of up to 1,300 m. This study considers the accuracy of evaluations of the pre-stress of the deep rock obtained using acoustic emission (AE) and deformation rate analysis (DRA) on samples taken at outcrop. The cores were subjected to different stresses to simulate the pre-stresses present at the tunnel elevation and tested with different delay times. The results indicate that the AE method gave poor results compared with those obtained by DRA which correlated well with the “memorized” pre-stress (maximum error 29.61%). Delays of up to 14 days do not appear to have a significant influence on the pre-stress evaluation.

Résumé

Le tunnel du projet de transfert d’eau du réservoir de Tseng-wen est en cours de creusement dans les grès de Changchikeng à Taïwan, à une profondeur allant jusqu’à 1,300 m. L’étude analyse la précision des évaluations des états de contraintes des roches en profondeur obtenues, soit par émission acoustique (AE), soit par analyse des taux de déformation (DRA) à partir d’échantillons prélevés sur des affleurements. Les carottes ont été soumises à différentes sollicitations mécaniques afin de simuler l’état de contrainte à la cote du tunnel et testées après différents temps de retard. Les résultats indiquent que la méthode AE donne des résultats médiocres, comparés avec ceux obtenus par la méthode DRA qui se corrèlent bien avec l’état de contrainte « mémorisé » (erreur maximum de 29,61%). Des retards de 14 jours n’apparaissent pas avoir une influence significative sur l’évaluation de l’état de contrainte.

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Acknowledgments

The first and second authors would like to thank National Science Council of Taiwan for their financial support (NSC 95-2221-E-006-111-MY3) in this project. In addition, special thanks are given to the officers in the Southern Region Water Resources Office, WRA, MOEA, Taiwan and the engineers in United Geotech., Inc., Taiwan for their help near the site. Appreciation is also given to MTS and PAC for their technical support during this study.

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Authors and Affiliations

  1. Department Civil Engng, National Cheng Kung University, No. 1, University Road, 701, Tainan, Taiwan

    Jian-Hong Wu & Shu-Chi Jan

  2. Sustainable Environment Research Center, National Cheng Kung University, No. 1, University Road, 701, Tainan, Taiwan

    Jian-Hong Wu

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  1. Jian-Hong Wu
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  2. Shu-Chi Jan
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Correspondence to Jian-Hong Wu.

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Wu, JH., Jan, SC. Experimental validation of core-based pre-stress evaluations in rock: a case study of Changchikeng sandstone in the Tseng-wen reservoir transbasin water tunnel. Bull Eng Geol Environ 69, 549–559 (2010). https://doi.org/10.1007/s10064-010-0265-3

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  • DOI: https://doi.org/10.1007/s10064-010-0265-3

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