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AN-8号孔における流向・流速検層

Underground Water Direction and Velocity Sounding at AN-8 Borehole

平田 洋一*; 松岡 永憲*; 後藤 和幸*

Hirata, Yoichi*; Matsumoto, Eiken*; Goto, Kazuyuki*

本報告書は,岐阜県瑞浪市明世町月吉地区で掘削されているAN-8号孔において実施した,地下水流向流速計LD-60C型により礫岩層中の流速と流向を測定した結果を取りまとめたものである。試験を実施した地層は,瑞浪層群の明世累層,土岐夾炭層に分類される。試験結果は次に示すとおりである。(1)地下水の流速は,1.2$$times$$10-4cm/sec$$sim$$3.2$$times$$10-6cm/secの範囲を示した。(2)地下水の流向はGL-25.85mとGL-45.35mで,ほぼ東方向を示し,GL-37.60mとGL-38.60mは西方向を示した。(3)東方向を示した地層は,共に20$$sim$$50cmと薄い礫岩層であった。西方向の流向を示した地層は,約170cmの層厚の同一の礫岩層であり,この流速は比較的速かった。

This paper describes the measurement result of underground water direction and velocity with Type LD-60 at AN-8 borehole. The investigation site including AN-8 is in Tsukiyoshi area Akiyo-chou, Mizunami city Gifu pref.The measurement rock bed is conglomerate that is classified Mizunami group, Akeyo Toki coal-bearing formation.The measurement result is as follows.(1)The underground water velocities are from 0.00012 to 0.0000032cm/s.(2)The underground water direction at GL-25.85m and GL-45.35m is east, and at GL-37.60m and GL-38.60m is west.(3)The rock beds that flows is toward east is thin, the thickness of these are from 20 to 50cm.The measurement sections that flow toward west are located in one rock bed which thickness is about 170cm, and these velocities are faster than others.

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