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 17, Issue 1
Displaying 1-3 of 3 articles from this issue
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  • Physical Properties of Weathered Andesite
    Michito OMI, Tetsuji KANAZAWA, Masayasu INOUE
    1976 Volume 17 Issue 1 Pages 1-9
    Published: June 30, 1976
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.17.1
    JOURNAL FREE ACCESS
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    Various physical properties have been investigated on water-saturated specimens of andesitic rocks, weathered to different degrees, in the western parts of Kumamoto city. Experiments have been made to obtain a difference of physical properties with the degree of weathering.
    It was recognized that Poisson's ratio calculated from elastic wave velocities increases with progress of weathering. It takes a value within the range of 0.25-0.32 for fresh rocks, and about 0.4 for strongly weathered rocks.
    There are close correlations between the physical properties of andesitic rocks, so that we have been established experimental formulas.
    The degree of rock weathering have been usually estimated by one physical property, according to variability of it. For more accurate evaluation of weathering stage of rocks, in this paper, we used three factors which are uniaxial compressive strength, velocity of dilatational wave and apparent density.
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  • On the Characteristics of the Artificial Fine Aggregate Made from the Granitic Rocks
    Kiyoshi MIURA
    1976 Volume 17 Issue 1 Pages 10-19
    Published: June 30, 1976
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.17.10
    JOURNAL FREE ACCESS
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    Weathered granitic rocks and granodioritic rocks were collected from the various parts of Shimane Prefecture and made the fine aggregate for concrete from these rocks.
    In this paper, the writer discussed the inter-relation between the characteristics of the artificial fine aggregate obtained from the measurements using aggregate testing method and the content of altered minerals produced by weathering.
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  • Study on Grasping the Dynamic Geological Information Required for Engineering Geology Obtained from the Static Geomorphological and Geological Information
    Ryohei IMAMURA
    1976 Volume 17 Issue 1 Pages 20-33
    Published: June 30, 1976
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.17.20
    JOURNAL FREE ACCESS
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    Geological phenomena are originally dynamic one, and history of the earth has been basically investigated and systematized from the dynamic point of view in the field of geology. However, only one side of static characteristics of beds, rocks and geological structures, getting from the geological study, has been take the attention of the civil engineerings.
    In this paper, following three main themes are studied and the results and authors considerations are presented.
    (1) How to extract the types of geological phenomena occured in the past obtained from the static geomorphological and geological informations which are recognizable in the present, and how to get them joined to predict of the disasters which may be occured in future.
    (2) How to grasp the geological phenomena in progress at present, that is “movement” of surface of the earth which is very difficult to recognize.
    (3) How to grasp the time informations concerned with occuring these phenomena.
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