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 14, Issue 3
Displaying 1-3 of 3 articles from this issue
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  • Weathering during late Pliocene of Gotsu plutonic rocks
    Weathering in Plutonic Rocks (Part 1)
    Kiyoshi Miura
    1973 Volume 14 Issue 3 Pages 87-102
    Published: September 30, 1973
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.14.87
    JOURNAL FREE ACCESS
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    In Gotsu district, central part of Shimane Prefecture, highly weathered reddish plutonic rocks are developed. These reddish weathered crusts in part underlie the Plio-Pleistocene Tsunozu formation. Main mineral compositions of the reddish weathered crust are kaolin and vermiculitic mineral.
    Undoubtedly these reddish weathered materials must have been formed under much warmer climatic circumstances during late Pliocene judged from the stratigraphical relation of the weathered crust to the Tsunozu formation. Not only climatic condition and physiographic features but also chemical and physical properties of the rocks take part in the weathering processes.
    In this study, the writer proposes a “degree of the absolute chemical freshness” based on the following empirical formula:
    Degree of the absolute chemical freshness
    FeO+MnO+MgO+CaO+Na2O+K2O/Al2O3+Fe2O3+H2O (+) (Weathered rock) /FeO+MnO+MgO+CaO+Na2O+K2O/Al2O3+Fe2O3+H2O (+) (Fresh rock)
    This formula is applicable to the applied geological works.
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  • On the Dynamic and Static Modulus of Rocks
    Yoshiro Hayashida
    1973 Volume 14 Issue 3 Pages 103-111
    Published: September 30, 1973
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.14.103
    JOURNAL FREE ACCESS
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    [in Japanese]
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  • On tne Landslides of the Murasugi District, Higashiaizu, Fukushima Prefecture, northeast Japan
    The mechanism of the occurrence of Block Glides
    Tomio Moriai, Koji Sasaki
    1973 Volume 14 Issue 3 Pages 113-120
    Published: September 30, 1973
    Released on J-STAGE: February 23, 2010
    DOIhttps://doi.org/10.5110/jjseg.14.113
    JOURNAL FREE ACCESS
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    The area where the landslides occurred is situated to the west of Atsushio in the Higashiaizu area, Fukushima prefecture. Geologically the area is occupied mainly by Neogene sediments and Quaternary deposits.
    The landslides in this area can be divided into three types, on the basis of geoglogic features, as follows:
    1) Landeslides along the line of the fault zone.
    2) Block glides down the bedding plane.
    3) Rock fragment flows.
    Among them, the Block glide type causes the greatest disaster.
    The mechanism of the Block glide was pursued in our studies, and in our efforts to determine it the author carried out the stability calculation of the landslides and the detailed geological survey. And it was concluded that Block glides are due to the permeation of water into vertical crucks, which are controlled by the geologic structure and are caused to occur at intervals of 1.5 meters.
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