| Project/Area Number |
18580245
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Irrigation, drainage and rural engineering/Rural planning
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| Research Institution | Kagawa University |
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Principal Investigator |
HASEGAWA Shuichi Kagawa University, Faculty of Engineering, Professor (00325317)
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| Co-Investigator(Kenkyū-buntansha) |
MUKAITANI Mitsuhiko Takamatsu National College of Technology, Associate Professor (10311094)
OKABAYASHI Kojiro Kochi National College of Technology, Associate Professor (70185461)
YAMANAKA Minoru Kagawa University, Engineering, Associate Professor (50264205)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥4,010,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥510,000)
Fiscal Year 2007: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2006: ¥1,800,000 (Direct Cost: ¥1,800,000)
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| Keywords | Geotechnical Engineering / Dynamic Soil Mechanics / Earth Structure / Soil Mechanics / Geophysical Exploration / ため池 / 堤体 / 表面波探査 / 常時微動測定 / 非破壊探査 / S波速度 / 卓越周期 / 増幅率 |
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| Research Abstract |
The Japanese Government anticipates an occurrence of a Nankai earthquake in Shikoku Island in the near future. Takamatsu, the capital city of Kagawa Prefecture, has been serious damaged by Nankai Earthquakes at intervals from 90 to 150 years. Recent earthquakes have suggested that many irrigation pond embankments could be seriously damaged in the event of an earthquake. The seismic damage is closely related to the embankment condition. It is therefore very important to clarify the embankment conditions when an earthquake-resist design of a structure is considered.
The objective of this study is to estimate the motion amplification of bank of irrigation ponds by surface wave exploration and microtremor measurement. In this study, four types of the irrigation ponds were classified. S-wave velocity of bank is small in the ponds situated in plain and large in the ponds situated in the foot of the mountain or mountain. However, with regard to S-wave velocity of alluvium, the difference in types of the ponds is small. The relation between S-wave velocity of bank and height of bank has positive correlation. Similarly, the relation between predominant period and height of bank has positive correlation. But, the relation between amplification and predominant period of bank has negative correlation. Motion amplification of bank is strongly affected by the vibration characteristics of the foundation and the bank.
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