Journal of the Japan Society of Engineering Geology
Online ISSN : 1884-0973
Print ISSN : 0286-7737
ISSN-L : 0286-7737
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Volume 31, Issue 3
Displaying 1-5 of 5 articles from this issue
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  • Effect of Confining Pressure and Pore Pressure on Permeability of Inada Granite
    Manabu TAKAHASHI, Atsuo HIRATA, Hitoshi KOIDE
    1990 Volume 31 Issue 3 Pages 105-114
    Published: September 25, 1990
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.31.105
    JOURNAL FREE ACCESS
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    Permeability of Inada granite was measured under confining pressure up to 20MPa, and pore water pressure up to 16 MPa. The Inada granite has three preferred orientations of splitting planes which are perpendicular each others. A transient pulse method was used to measure the permeability up to nano darcy (10-9) order in the three preferred orientations. The permeability is estimated from the decay curve of pulse of small pressure change combined with the compressibility and viscosity of water, and dimensions of sample. Linear decay characteristics indicate DARCY's law apparently hold even for this rather low pulse pressure.
    The measured permeability ranges from about 3×10-8 to 5×10-7 darcies. Permeability was not a simple function of the conventional effective confining pressure, that is, the difference between external confining pressure (Pc) and internal fluid pore pressure (Pp). Changes in permeability were found to be proportional to (bdPp-adPc), where the values of b/a are different for each three preexisting preferred orientations.
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  • Gamma-ray Spectra Survey in Futsukaichi Hot Springs, Fukuoka Prefecture
    The Reliability of Spectre Data
    Tohru MOGI, Shin'ichirou OKADA
    1990 Volume 31 Issue 3 Pages 115-123
    Published: September 25, 1990
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.31.115
    JOURNAL FREE ACCESS
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    We carried out a gamma-ray spectra survey to discuss the relation between geological structures associated with discharge of hot springs and gamma-ray intensities for three radioactive elements, 40K, 214Bi and 208Tl, using a portable multi-channel gamma-ray spectrometer, in the Futsukaichi Hot spring area, Fukuoka Prefecture, Southwest Japan. A data analysis method, based on Covell's method (1959), including the error estimation of observed data was used in this study. Detection limits of gamma-ray from each element based on Currie's method (1966) was also applied.
    Results of the field survey showed high gamma-ray intensity areas for Bi well correspond to inferred faults which are associated with discharge of hot springs. This means that 222Ra, the parent element of Bi, comes up to the surface together with circulating hot water. High intensity areas for Tl correspond to places of hot spring wells. This fact was interpreted that Tl is accumulated at the place where the hot water comes up to the surface rapidy, because 220Rn, the parent element of Tl, has very short half-life time. We concluded that the high gamma-ray intensities of Bi and Tl are an indicators for existence of upward-moving hot water flow.
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  • Alkali-Silica Reactive Rocks in the World (Part 2)
    Yasuhiko WAKIZAKA
    1990 Volume 31 Issue 3 Pages 124-133
    Published: September 25, 1990
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.31.124
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1990 Volume 31 Issue 3 Pages 134
    Published: September 25, 1990
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.31.134
    JOURNAL FREE ACCESS
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  • Close Relation between Geology and Geotechnical Engineering
    Toshio IKEDA
    1990 Volume 31 Issue 3 Pages 135-144
    Published: September 25, 1990
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.31.135
    JOURNAL FREE ACCESS
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