River Shannon Hydro-Electric Scheme: Failure of upstream slope of Fort Henry Embankment: Analysis
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Published:2002
M Long, I Lydon, E Conaty, 2002. "River Shannon Hydro-Electric Scheme: Failure of upstream slope of Fort Henry Embankment: Analysis", Reservoirs in a Changing World: Proceedings of the 12th conference of the BDS held at TRINITY COLLEGE, DUBLIN 4 – 8 September 2002, Paul Tedd
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An 80 m long section of the Fort Henry embankment failed due to rapid drawdown of the impounding reservoir in 1979. Back analyses using the limit state stability approach with total stress soil parameters and the technique favoured by US Corps of Engineers, yielded factors of safety greater than the true value of 1.0. A simple stability chart based effective stress analysis was able to model the slide accurately. Finite element analyses showed that both magnitude and rate of drawdown control the embankment stability. The safety level of the embankment under the current operating regime has been found to be adequate but with little scope for relaxation.
INTRODUCTION
FORT HENRY EMBANKMENT
CONTROL WATER LEVELS AND RATES OF DRAWDOWN
SITE INVESTIGATIONS
GROUND CONDITIONS / FAILURE SURFACE
SOIL PARAMETERS
ANALYSIS OF FAILURE
INFLUENCE OF RATE OF DRAWDOWN
CONCLUSIONS
ACKNOWLEDGEMENS
REFERENCES
