| 講演要旨(和文) | | 近年、多チャンネル表面波探査が堤防健全性調査の有効な手法として認識されてきた．しかし，大規模堤防に対して探査深度が十分でないなどの課題がある．筆者らは，二次元リニアアレイ表面波探査を大規模堤防で試験的に実施し，�‖腟�模堤防でも基盤までのS波速度構造が得られること，��表面波探査と整合的な結果が得られることなどを確認した．また，二次元リニアアレイ微動探査と表面波探査の分散曲線を結合することで，盛土表層から基礎地盤までの広範囲のS波速度構造を高分解能で探査できることが示された． |
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| | 講演要旨(英文) | | MASW (Multichannel Analysis of Surface Waves) has found favor as a survey technique for levee embankments. However, certain technical challenges, particularly the requirement to survey at greater depths, still remain. To address this, the authors carried out a feasibility study using a 2-Dimensional Linear Array Microtremor Survey Method (hereafter referred to as 2D-LAMS) on high levees. The results show that (1) 2D-LAMS was able to examine underlying formations at greater depths from high levee surfaces. (2) The results obtained by 2D-LAMS were in agreement with those obtained by MASW. We also determined that combining two dispersion curves, one obtained by 2D-LAMS and the other by MASW, resulted in high resolution S-wave velocity distributions from the levee surface to its foundation. |
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