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Abstract The rock wedges under left skewback of the upstream dam line are cut by many steep faults in the dam site of Baihetan Hydropower Station. They locate at the bottom and the downstream of the arch dam. Their stable movement or not will affect the safety of dam foundation and arch dam. The safety performance of arch dam and rock wedges are comprehensively analyzed considering the complicated crack hydraulic pressure in joint planes between rock wedges，various of water pressures are programmed and the approach is validated using the conceptual model in the software fast Lagrangian analysis of continua in 3 dimensions(FLAC3D). According to the results of calculation and the displacement of the selected typical nodes，the stability safety degree，surface safety factor and yield expansion of rock wedges are studied. Research shows that safety degree in sliding surface LS331 is lower than that in contact surface between the dam and the foundation，upstream dam heel of right bank begins to appear local yield when the overload safety coefficient is 1.5 with a consideration of many effects；the rock wedges cannot work normally when the overload safety coefficient is 3.1；the dam foundation can?t work normally when the overload safety coefficient is 3.3；and the rock masses under dam foundation is overall destroyed when the overload safety coefficient is 5.5.
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Received: 05 November 2010
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2011, Vol. 30 
