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Fig. 1 Analysis Mode Fig. 2 Fourier Spectrum at Dam Crest (Upstream-downstream direction) 3. CASE OF EMBANKMENT DAM [3] Due to the Iwate-Miyagi Nairiku Earthquake in 2008, settlement without sliding deformation was observed at Isawa Dam (ECRD, Fig. 3). The dynamic strength tests for construction materials and deformation analysis using cumulative damage theory were conducted. Through the analysis, the settlement can be reproduced accurately and it is important to consider saturated/unsaturated conditions in dam body for accurate evaluation (see Fig. 4). Fig. 3 FEM element Fig. 4 Vertical distributions of settlements REFERENCES [1] The Japan Commission on Large Dams, Acceleration Records on Dams and Foundations No.3, 2014 [2] SAKAMOTO. H et al. Three-dimensional behavior properties and reproduction analysis of an arch dam during large-scale earthquake, ICOLD Congress, 2018. [3] SATO H. et al. Reproduction analysis of settlement of Isawa dam under construction during the 2008 Iwate-Miyagi Earthquake, ICOLD Congress, 2012. 0 50 100 150 200 250 300 350 0 1 2 3 4 5 6 7 8 Frequency (Hz) Measured Values Analysis Values (modified) Analysis Values 地震時盛立面 220 240 260 280 300 320 340 360 380 EL.m 地震時の盛立面 1:2 .7 1:2.0 1 :0 .3 5 1 :0 .2 1 :0 .3 5 1 :0 .2コア ロック ロック フィルタ construction elevation at the earthquake 220 240 260 280 300 320 0.0 0.2 0.4 0.6 0.8 settelement (m) unsaturated (core) saturated (core) observed 12