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 28, Issue 4
Displaying 1-4 of 4 articles from this issue
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  • Shear Strength for Rock Joints with Irregular Shaped Asperities
    Ryokichi HAMAJIMA, Morito KUSABUKA, Hitoshi KOIDE, Tadahiko KAWAI, Tos ...
    1987 Volume 28 Issue 4 Pages 167-182
    Published: December 25, 1987
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.28.167
    JOURNAL FREE ACCESS
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    The mechanical properties of the rock masses are influenced by existence of joints and faults. Especially roughness of the discontinuous surfaces determine the strength-deformation characteristics of rock masses.
    Barton indicated the influence of the JRC (Joints Roughness Coefficient) for the arbitrary shaped asperities upon the shear strength, shear stiffness and normal stiffness. However, the Barton's shear strength criteria is only applicable to a domain of comparatively small confining pressure where does not get the asperities sheared. off. Ladanyi & Archambault developed a shear strength criteria for the asperities under the shear off condition. This criteria can take account of progressive failure when the asperities leave the initial condition of complete interlocking. The criteria, however, can be only applicable to the case of regular shaped asperities. In order to apply this criteria to analysis of the shear strength of actual rock mass, it is necessary to convert the irregular shape into a regular one.
    This study is based on a consideration of the applicability of the Barton's joint roughness as well as Ladanyi & Archambault's shear strength criteria and deals with a transformation of the irregular shaped asperities into a regular one in a discontinuous surfaces.
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  • Hygroscopicity of Coal Measure Rocks
    Masatomo ICHINOSE, Kenichi UCHINO
    1987 Volume 28 Issue 4 Pages 183-192
    Published: December 25, 1987
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.28.183
    JOURNAL FREE ACCESS
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    A knowledge of the mechanical properties of coal measure rocks is essential for strata control in coal mining operations, for example, in the maintenance of roadways and support at the coal face. And these properties are strongly influenced by water and moisture. Therefore, hygroscopicity is a fundamental factor in the experiments for studying the effect of water on the mechanical properties.
    In this paper, the equilibrium water content when exposed to moist air and liquid water was measured for samples taken from four coal mines in Kyushu and Hokkaido. Also, specific surfaces and pore size distributions of these samples were measured and their correlation with the equilibrium water content was investigated.
    The results of this study are summarized as follows;
    1) The moisture adsorption isotherms are of BET type.
    2) In some samples, water saturation of pores by water vapour adsorption at higher humidity is so high as to be more than 70% of the maximum saturation by sucking liquid water.
    3) The equilibrium water content at lower humidity is proportional to the specific surface and pore volume corresponding to the radius ranging between 37.5 Å and 103 Å.
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  • On Physical Properties of Soils Weathered from Tertiary Sedimentary Rock on Amakusa Island
    Shojiro ARAMAKI, Yoshito KITAZONO, Atsumi SUZUKI, Mitsuhisa KAJIWARA
    1987 Volume 28 Issue 4 Pages 193-200
    Published: December 25, 1987
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.28.193
    JOURNAL FREE ACCESS
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    It is said that many landslides occurred in specific geological areas where certain geological features, such as rock types, soil properties resulting from weathering and degree of weathering, were found.
    In this paper, the authers investigated the relationships between the physical properties of the soil and the frequency of landslides. They also discussed why more landslides occure in higher activity soils in the tertiary strata on Amakusa Island.
    Also, the difference of activity was explained by X-ray analysis, ignition loss and specifics surface.
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  • Using of the Geological Methods to the Submarine Strata
    As an Example of the Kansai International Airport in Osaka Bay
    Kojiro NAKASEKO
    1987 Volume 28 Issue 4 Pages 201-211
    Published: December 25, 1987
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.28.201
    JOURNAL FREE ACCESS
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