Evaluation of S-wave velocities in earth dam body on the basis of earthquake records and examination of aging process

2015 Fiscal Year Final Research Report

• Project/Area Number: 25420477
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Structural engineering/Earthquake engineering/Maintenance management engineering
• Research Institution: Saitama University
• Principal Investigator: MOGI Hidenori 埼玉大学, 理工学研究科, 准教授 (80261882)
• Co-Investigator(Kenkyū-buntansha): KAWAKAMI Hideji 埼玉大学, 大学院理工学研究科, 教授 (50125887) ; KATAOKA Shunichi 弘前大学, 大学院理工学研究科, 准教授 (60333712)
• Research Collaborator: OHMACHI Tatsuo
• Project Period (FY): 2013-04-01 – 2016-03-31
• Keywords: フィルダム / 地震波の伝播時間 / 経時変化 / NIOM法 / エージングプロセス

Outline of Final Research Achievements

In this study, we conducted Normalized Input-Output Minimization (NIOM) analysis of earthquake records at the crest, core, and gallery/foundation of many filldams in Japan such as Nagara dam, Tougane dam (the Japan Water Agency), Aratozawa dam, Koda dam (Miyagi prefecture) and Moriyoshizan dam (Ministry of Land, Infrastructure, Transport and Tourism) and examined the propagation velocities of seismic waves in the dam body. We also examined the nonlinear behavior and temporal changes of shear rigidity of the dam body. These examinations revealed that (1) the soil degradation in the dam bodies due to the extremely strong ground motion caused by the 2008 Iwate-Miyagi Nairiku earthquake and The 2011 off the Pacific coast of Tohoku Earthquake observed at Aratozawa and Koda dams, (2) healing process from the soil degradation was also observed.

Free Research Field

地震工学