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JAEA Reports

Underground Water Direction and Velocity Sounding at AN-8 Borehole

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

JNC-TJ7440 2005-061, 36 Pages, 1991/03

JNC-TJ7440-2005-061.PDF:6.6MB

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.

JAEA Reports

Hydraulic Test at AN-8 Borehole

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

JNC-TJ7440 2005-063, 50 Pages, 1990/08

JNC-TJ7440-2005-063.PDF:6.97MB

This paper describes the result of hydraulic test with PNC Aquifer Test Method in Akeyo formation at AN-8 borehole. PNC Aquifer Test Method can measure permeability and pore water pressure. The investigation site is located in Tsukiyoshi, Akeyo, Mizunami City Gifu prefecture.The testing result is as follows.(1)The difference of pore water pressure at the section from GL-9.4m to GL-11.9m and at the section from GL-8.9m to GL-11.4m is rather small. Pore water pressure at the depth at the section from GL-11.9m to GL-14.4m is lower than others.(2)Permeability is computed by two theories. One of them is Hvorslev's theory and other is Cooper's theory. Using both theories, there are few variation between at from GL-9.4m to GL-11.9m and at from GL-8.9m to GL-11.4m. But at the depth at from GL-11.9m to GL-14.4m, there is some variation.(3)Permeability at from GL-8.9m to GL-11.4m is about twice as large as the ones at from GL-9.4m to GL-11.9m.

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