TY  - CONF
A1  - Auel, C.
A1  - Thene, J.R.
A1  - Carroll, J.
A1  - Holmes, C.
A1  - Boes, R.M.
T1  - Rehabilitation of the Mud Mountain bypass tunnel invert
T2  - VINGT SIXIÈME CONGRÈS DES GRANDS BARRAGES Vienne, Juillet 2018
N2  - This paper describes the design of the new tunnel invert lining of the 9-foot tunnel at Mud Mountain Dam, Washington, USA. The tunnel diverts all bed load sediments into the tailwater. Major invert abrasion has been observed in the existing steel lining. The new invert design consists of 0.59 m2 and 0.79 m2 granite blocks that are 0.25 m thick and placed tightly together along the tunnel. Stability analysis showed factors of safety ranging from 1.2 to 2.6 against uplift. This will be achieved with strip drains placed in the bedding material along the tunnel. A service-design-life analysis was performed using abrasion prediction modelling.
This model was based on abrasion measurement data acquired from granite field tests at Pfaffensprung sediment bypass tunnel, Switzerland. The estimated annual abrasion depths for the granite were approximately 0.50 mm/year for average sediment transport conditions.
Y1  - 2018
UR  - https://www.hb.fh-muenster.de/opus4/frontdoor/index/index/docId/15141
UR  - https://nbn-resolving.org/urn:nbn:de:hbz:836-opus-151413
PB  - COMMISSION INTERNATIONALE DES GRANDES BARRAGES
ER  -