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発表 Case study of detecting hard rock among soft one in serpentinite area by measuring magnetic susceptibility of pilot boring cores in tunnel excavation

作成年度 2011年度
論文名 Case study of detecting hard rock among soft one in serpentinite area by measuring magnetic susceptibility of pilot boring cores in tunnel excavation
論文名(和訳) 蛇紋岩地山のトンネル掘削におけるボーリングコアの地質情報による硬質岩の検出事例
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)
防災地質チーム岡崎 健治(OKAZAKI Kenji)
防災地質チーム宍戸 政仁(SHISHIDO Masahito)
防災地質チーム井上 豊基(INOUE Toyoki)
防災地質チーム伊東 佳彦(ITO Yosihiko)
北海道開発局高橋 幸継(TAJAHASHI Yukitsugu)
抄録
Tunnel construction costs depend on the type of bedrock. When hard rock exists between layers of rock that are not hard、 drilling excavation must be combined with blasting、 which raises the construction cost. Preliminary geological surveys、 such as geophysical exploration or boring、 are necessary to determine the distribution of rock by type. When tunnels for national highways are constructed in Hokkaido、 Japan、 horizontal boring is executed to examine such distribution before tunnel excavation. However、 the geological information from horizontal boring is sometimes insufficient to determine the rock types throughout a section of tunnel、 and the presence of rock of types not found by horizontal boring can greatly hinder excavation. In this study、 rock in cores from horizontal boring was classified into typical types、 and the relationship between the unconfined compressive strength and magnetic susceptibility of each rock type was examined. Observation of cores and measurement of compressive strength test confirmed different strengths in rock from the horizontal bore core. Hard rock tended to have low magnetic susceptibility、 whereas soft rock tended to have high magnetic susceptibility. As one move from soft rock to hard rock、 or vice versa、 the magnetic susceptibility changes at about 1 or 2 meters from the boundary between the rock types. This suggests that immediately beyond locations where the magnetic susceptibility decreases、 hard rock probably exists.
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