2007 Fiscal Year Final Research Report Summary
3D geophysical investigation methods for evaluating non-uniformity of housing site
| Project/Area Number |
18560548
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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 |
Building structures/materials
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| Research Institution | Kyoto University |
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Principal Investigator |
TAMURA Shuji Kyoto University, DPRI, Associate Professor (40313837)
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| Project Period (FY) |
2006 – 2007
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| Keywords | Housing site / Nonuniform ground / Rayleigh wave method / Dispersion curve / Wave propagation / Array observation / Geophysical investigation methods |
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| Research Abstract |
In recent years, defective homes have emerged as a social issue. It is reported most of the defective homes are caused by ground and/or foundation failures. Some ground and foundation failures are caused by local nonuniform ground, such as local soft ground, buried industrial junks and buried roots of a tree. However, previous geophysical investigation methods can not find out local nonuniform ground in many cases. Therefore, a method is presented for identification of local nonuniform ground position based on measurement of the angle between arrival wave and a vibration source. Vertical ground motion is measured using a circular array of six sensors. The angle between the arrival wave and the source can be determined, based on F-k spectrum analysis of the data. To examine the validity of the proposed method, field investigations and 3D FEM analysis were performed.
The proposed method was performed at a housing site to locate nonuniform ground position. Rayleigh wave method, Swedish sounding test, dynamic penetration test and H/V spectrum were performed at the place where the proposed method indicated local nonuniform ground was located. The results of Rayleigh wave method, Swedish sounding test and dynamic penetration test at the place were different from those around the place. On the other hand, predominant periods of H/V spectrum remained unchanged. After the subsurface investigations, a lot of buried baked-muds were found at the place.
3D FEM analysis was performed to investigate the effects of local nonuniform ground on wave propagation. It is shown that (1) the arrival wave angles differ from the source angle in case that local nonuniform ground locates between the sensor array and the source ; (2) effects of local soft ground on the wave propagation is greater than that of local hard ground.
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[Journal Article] Evaluation of non-uniformity of housing site based on wave propagation property -Comparison with various explorations of ground(in Japanese)2007
Author(s)
Hatsuyama, M., Tamura, S., Aida, T., Tabata, K., Nakazawa, H., Tokuyama, H
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Journal Title
Proceeding of 42nd Annual meeting of Japanese Geotechnical Society
Pages: 41-42
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Evaluation of non-uniformity of housing site based on arrival wave angle-Comparison with various explorations of ground(in Japanese)2007
Author(s)
Hatsuyama, M., Tamura, S., Aida, T., Tabata, K., Nakazawa, H
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Journal Title
Summarize of technical papers of annual meeting, AIJ B-2
Pages: 247-248
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Evaluation of non-uniformity of housing site based on arrival wave angle-Comparison with various explorations of ground2007
Author(s)
Hatsuyama, M., Tamura, S., Aida, T., Tabata, K., Nakazawa, H
Organizer
Annual meeting, AIJ
Place of Presentation
Fukuoka University
Year and Date
2007-08-29
Description
「研究成果報告書概要(欧文)」より
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[Presentation] Evaluation of non-uniformity of housing site based on wave propagation property-Comparison with various explorations of ground2007
Author(s)
Hatsuyama, M., Tamura, S., Aida, T., Tabata, K., Nakazawa, H., Tokuyama, H
Organizer
42nd Annual meeting of Japanese Geotechnical Society
Place of Presentation
Nagoya Congress Center
Year and Date
2007-07-04
Description
「研究成果報告書概要(欧文)」より
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