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Abstract The fast Lagrangian analysis of continua in three dimensions(FLAC3D) was adopted based on nonlinear finite element analysis，to develop three-dimensional elastoplastic numerical simulation of Wudongde arch dam. Nine possible sliding blocks were determined through the altitude of discrete fracture inside the arch dam rock mass. The calculation method of the experiment was to apply the finite element stress value to the sliding face through interpolation，discount sliding face shearing strength based on the altitude of discrete fracture inside the sliding face，and compute the factor of safety through 3D vector sum method. The results indicate that the stress and displacement distributions are basically symmetrical to the river valley. However，affected by the faults F15，f42 and the K25 karst system，there is a slightly larger area affected in right abutment than that in left abutment. The results also show that the nine sliding blocks have high margin of safety under normal impounding level；temperature rise load causes the stability reduction of a majority of wedge blocks，while temperature drop load mainly affects the stability of right abutment negatively. Under the seismic load，the stabilities of all the wedge blocks reduce largely with an average reduction of 30% and the maximum reduction of 53.9%. However，the global abutments rock mass can still remain stable under such situation.
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Received: 21 December 2011
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2012, Vol. 31 
