Study on the Mechanism of the Peculiar Behaviors of the Aratozawa Dam During the 2008 Earthquake
Nario Yasuda*,†, Norihisa Matsumoto*, and Zengyan Cao**
*Japan Dam Engineering Center
Ikenohata 2-9-7, Nissyoku Bldg., Taito, Tokyo, Japan
**JP Business Service Corporation, Tokyo, Japan
During the Iwate-Miyagi Nairiku Earthquake (M7.2) of June 14, 2008, seismic motions with a maximum acceleration of 1,024 cm/s2 in the stream direction were recorded at the foundation bedrock of Aratozawa Dam, a rockfill dam located approximately 16 km from the epicenter. However, the maximum response acceleration in the same direction near the center of the dam crest was 525 cm/s2, and the acceleration amplification ratio of the dam body was far lower than that normally considered for a rockfill dam. Furthermore, it was measured that the crest settled down 19.8 cm after the earthquake. In this study, the dynamic properties of the embankment materials were identified using reproduction analysis of past earthquakes, and the recorded behaviors of the dam body during the mentioned strong earthquake were simulated. The generating mechanism of the peculiar earthquake behavior was investigated based on the results of the earthquake response analysis. Furthermore, in order to understand the deformation mechanism, sliding stability analysis and cumulative damage analysis were performed. According to the results, the residual deformation of the dam body after the strong earthquake is inferred to be caused by the shaking settlement of the embankment materials.
-  K. Shimamoto, N. Sato, T. Ohmachi, H. Kawasaki, and S. Iwai, “Report on survey of damage to dams by the 2008 Iwate – Miyagi Earthquake,” 2009.
-  T. Ohmachi and T. Tahara, “Nonlinear earthquake response characteristics of a central clay core rockfill dam,” Soils and Foundations, Vol.51, No.2, pp. 227-238, 2011.
-  H. Mogi, H. Kawakami, Y. Oda, and T. Ohmachi, “Temporal change of propagation time of seismic waves estimated from long-term earthquake observation records at rockfill dam,” Jorunal of Japan Society of Dam Engineers, Vol.25, No.4, pp. 218-229, 2015 (in Japanese).
-  N. Sato, H. Soda, and A. Sai, “Study on dynamic deformation property of rock-fill dam by the earthquake records,” Journal of Japan Society of Dam Engineers, Vol.25, No.4, pp. 230-239, 2015 (in Japanese).
-  F. Miura and H. Okinaka, “Dynamic Analysis Method for 3-D Soil-Structure Interaction Systems with the Viscous Boundary Based on the Principle of Virtual Work,” Proc. of JSCE, No.404/I-11, 1989 (in Japanese).
-  J. Lysmer and R. L. Kuhlemeyer, “Finite dynamic model for infinite media,” Proc. ASCE, EM 4, pp. 859-877, 1969.
-  Y. Sawada and T. Takahashi, “Study on the material properties and the earthquake behaviors of rockfill dams,” Proc. of the 4th Japan Earthquake Engineering Symposium, pp. 695-702, 1975.
-  I. M. Idriss, J. Lysmer, R. Hwang, and H. B. Seed, “Quad-4, A Computer Program for Evaluating the Seismic Response of Soil Structures by Variable Damping Finite Element Procedures,” EERC Report, No.73-16, 1973.
-  M. Yasuda, N. Ogata, and M. Shimada, “Dynamic deformation properties of core materials according to vibration triaxial testing,” Proc. of the 14th Conf. on Soil Engineering Research, 1980.
-  K. Baba and H. Watanabe, “On a Consideration for an Earthquake-resistant Design Method for Rockfill Dams,” 13th Congress on Large Dams, Q51, R15, pp. 1049-1074, 1979.
-  N. Matsumoto, N. Yasuda, and N. Sakaino, “Dynamic property testing of coarse-grain materials using a large cyclic triaxial tester,” Civil Engineering Research Documents of the Ministry of Construction, No.2146, 1984.
-  H. Watanabe and K. Baba, “A study on sliding stability evaluation method based on dynamic analysis of fill dams,” Large Dams, No.97, pp. 25-38, 1981 (in Japanese).
-  Committee on the strengthening technology of Murayama dam and reservior, “Murayama Reservoir Maintenance Committee Report,” 2002 (in Japanese).
This article is published under a Creative Commons Attribution-NoDerivatives 4.0 International License.