| 講演要旨(和文) | | 近年,集中豪雨が多発しており,大規模な洪水が発生し,堤防整備の重要性が高まっている.よって,既存堤防ならびに基礎地盤の土質構造を把握し,浸透危険箇所の有無を判断し,補強改修を実施していくことが河川防災上重要な事と言える.河川堤防の安全性に関わる土質調査では,ボーリングを主体とした調査手法が用いられているのが現状である.しかし,河川堤防は線形の長大構造物であるため,強度や水理構造が一様ではなく,局所異常の抽出が調査の主眼になることから,経済性や施工性の面でボーリングのみの調査には限界があり,物理探査の適用が期待されている.また,近年,調査の対象は三次元空間であることから,社会のニーズが三次元,もしくは時間変化を捉える四次元へと変化しているのが現状である.本報告は,堤体および基礎地盤の性状を把握するために実施した三次元電気探査の適用性評価をまとめたものである. |
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| | 講演要旨(英文) | | In late years concentrated downpour occurs frequently, and a large-scale flood occurs, and importance of the dike maintenance the river embankments. Therefore, it is important in river disaster prevention to carry out a dike and grasp of the quality of soil structure of the basic ground, the judgment of the penetration black spot, reinforcement repair. By the quality of soil investigation of the river embankments, boring is used mainly. However, because the river embankments is a linear tall and stout structure, strength and underground waterway structure are not same, and local abnormal extraction becomes the principal objective of the investigation. There is a limit for investigation only for boring with an economy and execution-related aspect, and the application of the geophysics is expected. In addition, in late years it is the present conditions three dimensions of social needs or that change into the four dimensions to arrest a change in time because three dimensions of objects of the investigation are space. This report gathered up the applicability evaluation of the three-dimensional electrical survey that I carried out to grasp the river embankments body and a property of the basic ground. |
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