Session Start Date

5-6-1984

Abstract

The Bridge River Powerhouse No. 1 was constructed between 1946 and 1950 on the north shore of Seton Lake near Lillooet, British Columbia, Canada. The Powerhouse contains four Pelton wheel (impulse) turbines generating a total of 200 MW of electrical power. When the powerhouse was completed and the first units placed in operation severe and extensive ground cracking occurred behind and beyond the powerhouse. The ground movement shifted the powerhouse slightly toward the lake, and cracked the concrete penstock tunnels. As a result of this the foundation under the powerhouse was thoroughly investigated and instrumentation installed to record and assess further movement. Drs. K Terzaghi, V. Dolmage, A. Casagrande and later Dr. R.M. Hardy provided expert advise on assessing the problem and devising remedial measures. This paper reviews the causes of cracking, 33 years of powerhouse instrumentation data and remedial measures carried out to stabilize the powerhouse.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

First Conference

Publisher

University of Missouri--Rolla

Publication Date

5-6-1984

Document Version

Final Version

Rights

© 1984 University of Missouri--Rolla, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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May 6th, 12:00 AM

Foundation Problems and Solutions at the Bridge River, Powerhouse No. 1

The Bridge River Powerhouse No. 1 was constructed between 1946 and 1950 on the north shore of Seton Lake near Lillooet, British Columbia, Canada. The Powerhouse contains four Pelton wheel (impulse) turbines generating a total of 200 MW of electrical power. When the powerhouse was completed and the first units placed in operation severe and extensive ground cracking occurred behind and beyond the powerhouse. The ground movement shifted the powerhouse slightly toward the lake, and cracked the concrete penstock tunnels. As a result of this the foundation under the powerhouse was thoroughly investigated and instrumentation installed to record and assess further movement. Drs. K Terzaghi, V. Dolmage, A. Casagrande and later Dr. R.M. Hardy provided expert advise on assessing the problem and devising remedial measures. This paper reviews the causes of cracking, 33 years of powerhouse instrumentation data and remedial measures carried out to stabilize the powerhouse.