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Seismic Slope Stability and Liquefaction Potential of Large Existing Local Dams

- In order to increase the local material dam capacity to sustain from the big floods as the effect of climate change recently, the existing dams in Vietnam are frequently considered the two remedial design proposals either increasing the spillway discharge capacity or raising the dam height to increase the storage volume of the reservoir during the flood season. In addition, regarding the dam constructed on the earthquake prone area, the seismic slope stability and liquefaction potential caused by strong earthquake need to be carefully examined. Numerical study was implemented on the Phu Vinh large dam based on the site geotechnical data with many scenario loading cases. The analysis results showed that the static slope stability factors of safety could be satisfied by the existing standards; however, seismic factors of safety decreased significantly under unity with three cases of earthquake (T=475 years, 145 years and 10,000 years). In addition, liquefaction potential could be possible at the sandy layer under downstream rockfill. The safety measures need to be implemented in the design and construction of the existing and /or the new large dams.