| 講演要旨(和文) | | 土木研究所と物理探査学会は，平成25年度より実施している「堤防及び河川構造物の総合的な点検・診断技術の実用化に関する研究開発」の一環として，平成27年度は，阿賀川右岸5.1KP付近の堤防開削面で原位置調査を行った．調査地は平成26年度調査で堤防横断面の高分解能統合物理探査を行なった箇所であり，盛土内部のS波速度および比抵抗値について，地表面からの探査結果と開削面での測定結果を比較し，探査結果を評価した． 開削前後で得られたS波速度と比抵抗分布は互いに整合的であり，さらに，これらの物理量は土質分布とも対応していることが確認できた． 一方，地表面からの比抵抗法探査では検出が難しい土層の分布が明らかになり，そのような土層の検出方法についても検討した．その結果,既存のボーリング調査結果や他の探査結果を既知情報として解析に取り込むなどの方法が有効であることが示された． |
|
|
| | 講演要旨(英文) | | Public Works Research Institute and the Society of Exploration Geophysicists of Japan have been carrying out a series of studies aiming the research and the development of enriched investigation and for establishing the assessment method for river levees and their related structures since 2013. We acquired the ground truth data in 2015 on an open-cut slope surface of a levee at the 5.1 KP on the Aga River where we had performed a high resolution integrated geophysical investigation from the surface in 2014. We compared the integrated geophysical investigation results with the ground truth data, and confirmed that the both results matched well. Furthermore, it was verified that the S-wave velocity and resistivity mapping results corresponded to the various soil type distributions at the slope. Our study also revealed that a specific soil distribution pattern was difficult to be detected by the resistivity method from the surface. In order to obtain this soil distribution pattern, drilling and other geophysical investigative methods should be included as prior information at the analysis stage. |
|
|
|
| |
|