Development of measuring technique of ground displacement in the toe of landslide

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  • 地すべり地末端の崩壊斜面における地盤変位の計測手法の開発
  • ジスベリチ マッタン ノ ホウカイ シャメン ニ オケル ジバン ヘンイ ノ ケイソク シュホウ ノ カイハツ

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Abstract

Sediment deposited at the foot of landslides stabilizes them temporarily, but removal of such sediment when installing emergency measures requires extra caution to avoid reactivating the landslide. It is therefore necessary to remotely monitor the movement of landslides to avoid secondary disasters for safety reasons as well as for reliable monitoring.<br>One of the main remote monitoring methods is to use a non-prism type optical total-station, which is useful for measuring the ground displacement from observation stations because no measurement target is needed. However, the measurement error may be higher than that of an optical total-station that uses targets, and measurement at night is extremely difficult. To overcome these problems, in this study we developed a new method of remotely setting up targets for an optical total-station from landslides. This new method uses a crossbow and a paint capsule attached at tip of arrow. A paint capsule is launched by crossbow, broken and gets on slope as a target of total-station with ± 300cm of accuracy at 300m distance. The target helps the displacement monitoring in landslide.

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