Research Article
Sep 1978
Excavation of World’s Largest Underground Powerhouse
Authors: Laurent Hamel and David Nixon, M.ASCEAuthor Affiliations
Publication: Journal of the Construction Division
Volume 104, Issue 3
Abstract
The LG-2 site is located in the nordic region of northwestern Quebec and is the principal installation of the La Grande River hydroelectric power development. As such, it presents formidable problems in organization, logistics, contract administration, and construction techniques. The powerhouse contains 16 generating units; each of 333 mw and required 3,650,000 cu yd (2,792,000 m3) of rock excavation. The rock is granitic gneiss typical of the Canadian shield region and is of exceptionally good quality. Rock support is entirely by rock bolts with shotcrete used locally. Roof arch deformation is minimal. Considerable specialized excavation equipment was used. Rock pillars at the intake and rock ledges to support the main overhead cranes in the powerhouse complex were successfully carved by controlled blasting. Economies in excavation were achieved by relying on field control by a geotechnical team rather than design conservation.
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Published In
Journal of the Construction Division
Volume 104 • Issue 3 • September 1978
Pages: 333 - 351
Copyright
© 1978 American Society of Civil Engineers.
History
Published in print: Sep 1978
Published online: Feb 11, 2021
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Authors
Affiliations
Laurent Hamel
Project Mgr., James Bay Energy Corp., LG-2 Site, La Grande, Quebec, Canada
David Nixon, M.ASCE
Resident Geotechnical Specialist, James Bay Energy Corp., LG-2 Site, La Grande, Quebec, Canada
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ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.