THREE-DIMENSIONAL STABILITY ANALYSIS OF DAM ABUTMENT OF WUDONGDE ARCH DAM
SHEN Hui1，LUO Xianqi1，LI Ye1，WENG Yonghong2
(1. School of Naval Architecture，Ocean and Civil Engineering，Shanghai Jiaotong University，Shanghai 200240，China；
2. Changjiang Institute of Survey，Planning，Design and Research，Changjiang Water
Resources Commission，Wuhan，Hubei 430010，China)
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.
董建华，谢和平，张 林，等. 大岗山双曲拱坝整体稳定三维地质力学模型试验研究[J]. 岩石力学与工程学报，2007，26(10)：2 027-2 036.(DONG Jianhua，XIE Heping，ZHANG Lin，et al. Experimental study of 3D geomechanical model on global stability of Dagangshan double curvature arch dam[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(10)：2 027-2 036.(in Chinese))
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2012, Vol. 31 
