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Underwater tunnel piercing in refurbishment of Akkats power station
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Hydraulic Engineering.
2010 (English)Conference paper (Refereed)
Abstract [en]

Akkats has suffered a number of incidents that were complicated to repair and led to frequent shutdowns. Its existing unit is to be replaced with two smaller units. Underwater tunnel piercing is needed when one of the units is to be put in operation. The open type of piercing is chosen, in which the tunnel and the gate shaft are pre-filled with water. Hydraulic model studies are made to examine involved hydraulic parameters. The deposit profile of the blasted rock in the stone pit and the upsurge in the gate shaft are strongly affected by the plug thickness and shaft water level. To reduce upsurge height, the reservoir and the shaft should have the same water level. A few countermeasures are discussed for upsurge suppression. The stone pit should be optimized for the countermeasure in question so as to reduce intake head losses and prevent the blasted rock from entering the tunnel.

Place, publisher, year, edition, pages
Keyword [en]
Akkats, refurbishment, lake tapping, underwater piercing
National Category
Civil Engineering
URN: urn:nbn:se:kth:diva-179773OAI: diva2:889432
ICOLD Annual Meeting and Symposium, May 2010, Hanoi, Vietnam

QC 20160104

Available from: 2015-12-25 Created: 2015-12-25 Last updated: 2016-01-04Bibliographically approved

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Yang, James
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