応用地質
Online ISSN : 1884-0973
Print ISSN : 0286-7737
ISSN-L : 0286-7737
14 巻 , 3 号
選択された号の論文の3件中1~3を表示しています
  • 三浦 清
    1973 年 14 巻 3 号 p. 87-102
    発行日: 1973/09/30
    公開日: 2010/02/23
    ジャーナル フリー
    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.
  • 林田 精郎
    1973 年 14 巻 3 号 p. 103-111
    発行日: 1973/09/30
    公開日: 2010/02/23
    ジャーナル フリー
    岩石の弾性係数は測定のために加えられた応力の大きさと応力速度の関数である。応力速度が大きい程, 応力が小さい程見掛けの弾性係数が大きくなる。このような力学的特性をもつ岩石は, 塑性要素と遅延要素とが連続的に分布する力学的モデルで代表させることができる。この場合, 個々の要素の定数は応力の大きさ, 応力速度などによって変るのでそれ程大きな意味はもっていない。
    岩石は固結の程度によって塑性的性質の顕著に現われる応力領域がある。これは岩石を力学的に研究する場合に重要なことである。
  • 盛合 禧夫, 佐々木 康二
    1973 年 14 巻 3 号 p. 113-120
    発行日: 1973/09/30
    公開日: 2010/02/23
    ジャーナル フリー
    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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