The constant valley shrinkage deformation of the Xiluodu arch dam occurs after water storage，and the valley deformation doesnot converge at present，which has a great influence on the local stability and overall stability of project. By analysing the geological conditions and in-situ deformation data after impounding，the mechanism of valley shrinkage deformation of Xiluodu arch dam is revealed. The seepage field and inclination of interlayers control the deformation characteristic. An elastic-viscoelastic-viscoplastic nonlinear creep model considering effect of pore pressure on spherical stress tensor and yield surface is proposed to analyse the valley deformation. Based on the monitoring data of deformation at early stage of water storage，the creep parameters of rock mass are back analysis，which is adopted to predict the trend of shrinkage deformation and the effect on dam safety. After back analysis，the numerical results of the normal water level agree well with the monitoring data，and the deformation process of the valley is simulated exactly. After ten years，the slope deformation tends to converge，but the overall deformation value is large，and the extrusion on dam abutment is severe，which need to be paid more attention.
何 柱1，刘耀儒1，杨 强1，程 立1，薛利军2. 溪洛渡拱坝谷幅变形机制及变形反演和长期稳定性分析[J]. 岩石力学与工程学报, 2018, 37(S2): 4198-4206.
HE Zhu1，LIU Yaoru1，YANG Qiang1，CHENG Li1，XUE Lijun2. Mechanism of valley deformation of Xiluodu arch dam and back analysis and long-term stabilyty analysis. , 2018, 37(S2): 4198-4206.
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2018, Vol. 37 
