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発表 Study on systematic inspection method for slope using digital photogrammetry

作成年度 2011年度
論文名 Study on systematic inspection method for slope using digital photogrammetry
論文名(和訳) デジタル写真を用いた簡便な斜面管理手法に関する研究
論文副題
発表会 8th International Symposium on Field Measurements in GeoMechanics
誌名(No./号数)
発表年月日 2011/09/12 ~ 2011/09/16
所属研究室/機関名 著者名(英名)
防災地質チーム伊東 佳彦(ITO Yosihiko)
防災地質チーム宍戸 政仁(SHISHIDO Masahito)
防災地質チーム日下部 祐基(KUSAKABE Yuuki)
抄録
Though digital photos are routinely taken for slope inspection along national road in Hokkaido、 they are not systematically applied for the prediction、 location or volume estimation of failures. The authors made the applicability study for such digital photos for road slope management. For the purpose、 two methods were studied. One is a background differencing technique in which changes are identified by superimposing photos taken by digital camera with the same angle in different times. Another is a variation measuring technique in which temporal changes are checked using terrain models prepared by a 3D-photo measurement system. Obtained results were as follows. (1) Though photographing positions are marked with paint or guide piles、 it is occasionally lost by snow fall and sediment cover or deleted paint. To clarify the allowable error for the cases、 we took a series of photos of which the photographing position was intentionally moved from the true point for a slope of 60m distance. As a result、 difference identification was found to be possible when the distance moved was until 10m. (2) To examine the accuracy of failure location、 photos were taken five times over a period of two years and three months for a slope of abandoned road where rock falls frequently have occurred. As a result、 many true rock falls were distinguished as the differences identified by the background differencing technique by eliminating those caused by change of light and vegetation. (3) To estimate the failure volume of a slope、 photogrametry was used to make terrain models from several photos、 and the failure volume was calculated as 57m3 from the difference between prepared terrain models before and after the failure.
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