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発表 弾性波を利用したコンクリートダム堤体の亀裂および強度分布評価手法に関する研究開発(その2)-表面波の減衰特性の利用-

作成年度 2019 年度
論文名 弾性波を利用したコンクリートダム堤体の亀裂および強度分布評価手法に関する研究開発(その2)-表面波の減衰特性の利用-
論文名(和訳)
論文副題
発表会 第141回物理探査学会学術講演会
誌名 第141回物理探査学会学術講演会
巻・号・回 141 
発表年月日 2019/10/29 ~ 2019/10/31
所属研究室/機関名 著者名(英名)
深田地質研究所高橋亨
首都大学東京細田大樹
首都大学東京小田義也
土木研究所尾西恭亮
抄録
Detection and evaluation of cracks that occur along the joints and lift surfaces of concrete are one of the important inspection items in the maintenance management of the concrete dams that have passed long after construction. To develop a new inspection technology which can complement existing technologies such as visual inspection and ultrasonic methods and inspect the large concrete dam more effectively, we are studying on an inspection technique using attenuation in addition to travel times of elastic waves. Last year, we conducted test measurements in a real concrete dam. In this test, for detecting and characterizing the cracks confirmed on a part of the lift surface of the dam body, elastic waves with a dominant frequency of about 1 KHz were transmitted and received using the top, slope, and inspection gallery of the dam. As one of the tests, surface waves were propagated along a measuring line crossing the crack, and the attenuation was measured and analyzed to estimate the crack depth. The test result showed that the estimated depth was almost identical to the depth confirmed by coring.
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