Deep Jet-Grouted Cut-Offs in Riverine Alluvia for Ertan Cofferdams
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 125, Issue 2
Abstract
Constructing the 245-m-high, double curvature concrete arch Ertan Dam required two high cofferdams (the upstream one exceeding 60 m) and the removal of 40 m of alluvium from the riverbed. Full penetration and partial penetration cut-offs were created at Ertan with jet-grouting techniques. Dewatering between the cofferdams and behind the cut-offs was successful and was maintained for more than 2 years against 40–70 m of water heads. This paper describes in detail the design rationale and main features, as well as the construction methods of both cut-offs. The treatment by conventional grouting of the rock below the jet-grouted wall is also outlined.
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References
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“Ghazi-Barotha Hydropower Project: Progress report on optimisation and validation tests for the jet-grouting, to be used for extending the cut-off in the riverbed of the Indus river.” (1997). Rep. GHA-97oct26 prepared for GBC Ghazi Barotha Contractors, SC-Sembenelli Consulting, Milano, Italy.
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Littlejohn G. S. ( 1982). “Design of cement based grouts.” Proc., Conf. on Grouting in Geotech. Engrg., ASCE, Reston, Va., 35–48.
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Information & Authors
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 125 • Issue 2 • February 1999
Pages: 142 - 153
History
Received: Jan 27, 1998
Published online: Feb 1, 1999
Published in print: Feb 1999
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