Date
02 Jun 1988, 10:30 am - 3:00 pm
Abstract
A 8.56 km long circular tunnel of 4.75 m diameter has been constructed under Maneri hydel project on the river Bhagirathi. The tunnel passes alternatively through quartzitic and metabasic rock formations of the young Himalayan terrain. Tunnel excavation was started from four faces, one at the upstream end at maneri, two from an intermediate adit at Heena, and one at the downstream end near Uttarkashi where a 80 MW surface powerhouse is located. In excavating the tunnel from different faces, the problems of tunnel face collapse with heavy ingress of water, cavity formations and large tunnel closures leading to buckling of steel ribs on account of squeezing ground conditions were encountered. In the paper the approach of these problems has been dealt in detail. The predicted values of support pressure obtained from Terzaghi, Barton et al and CMRS approaches have been compared with the observed values of support pressure. The CMRS approach shows promise for better results in both squeezing and the elastic ground conditions.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
2nd Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
University of Missouri--Rolla
Document Version
Final Version
Rights
© 1988 University of Missouri--Rolla, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Goel, R. K.; Jethwa, J. L.; and Singh, B., "Case History of Maneri-Uttarkashi Power Tunnel" (1988). International Conference on Case Histories in Geotechnical Engineering. 5.
https://scholarsmine.mst.edu/icchge/2icchge/2icchge-session2/5
Case History of Maneri-Uttarkashi Power Tunnel
A 8.56 km long circular tunnel of 4.75 m diameter has been constructed under Maneri hydel project on the river Bhagirathi. The tunnel passes alternatively through quartzitic and metabasic rock formations of the young Himalayan terrain. Tunnel excavation was started from four faces, one at the upstream end at maneri, two from an intermediate adit at Heena, and one at the downstream end near Uttarkashi where a 80 MW surface powerhouse is located. In excavating the tunnel from different faces, the problems of tunnel face collapse with heavy ingress of water, cavity formations and large tunnel closures leading to buckling of steel ribs on account of squeezing ground conditions were encountered. In the paper the approach of these problems has been dealt in detail. The predicted values of support pressure obtained from Terzaghi, Barton et al and CMRS approaches have been compared with the observed values of support pressure. The CMRS approach shows promise for better results in both squeezing and the elastic ground conditions.
