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発表 Detailed GPR survey for detecting boulders buried in a subgrade of a highway under construction

作成年度 2017 年度
論文名 Detailed GPR survey for detecting boulders buried in a subgrade of a highway under construction
論文名(和訳)
論文副題
発表会 31st Symposium on the Application of Geophysics to Engineering and Environmental Problems (SAGEEP 2018)
誌名 31st Symposium on the Application of Geophysics to Engineering and Environmental Problems (SAGEEP 2018)
巻・号・回 3 
発表年月日 2018/03/25 ~ 2018/03/29
所属研究室/機関名 著者名(英名)
土木研究所 地質・地盤研究グループHiroshi Kisanuki
応用地質株式会社Kunio Aoike
土木研究所 地質・地盤研究グループTakanori Ogahara
土木研究所 地質・地盤研究グループTomio INAZAKI
抄録
We conducted a detailed GPR survey to detect buried boulders in a highway under construction. The size of boulders were observed against the regulation for embankment subgrade materials. The illegal-size boulders should be removed because they might cause undulations of road surfaces. The survey area was 540 m in length and 20 m in width. First, two parties surveyed the area by using the same GPR tools combined with network RTK-GNSS positioning system. Next, we processed the acquired datasets by using a criterion that we established. The criterion was established based on GPR diffraction patterns to extract anomalies generated from buried boulders. A total of 148 anomalies were extracted. Then, we marked all locations of the anomaly on the road surface, and immediately dug at the extracted points to confirm whether illegal-size boulders were buried or not. As a result, boulders which was bigger than 20 cm in size were removed at 146 points. It took 6.5 days for this survey from a preliminary survey to excavations at all anomaly points. Such a quick handling contributed to minimize the delay of construction. This high hitting ratio demonstrated the effectiveness of dense GPR survey for detecting buried boulders.
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