洪積粘土の圧密に伴う微視構造の変化  [in Japanese] THE CHANGE IN MICROSTRUCUTURE OF PLEISTOCENE CLAYS DUE TO ONE DIMENSIONAL CONSOLIDATION  [in Japanese]

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Abstract

大阪湾周辺の2種類の洪積粘土 (大阪湾粘土Ma11層及び京都粘土Ma4層) を用いて, 不攪乱状態及び圧密に伴って変化する微視構造特性を, 水銀圧入型ポロシメータによる間隙径分布の測定と電子顕微鏡による観察から明らかにした. 実験に用いた洪積粘土は, 含まれる粘土鉱物は同一であるが, 京都粘土に比べて大阪湾粘土には多量の珪藻類が混入している. 京都粘土は, 圧密に伴い間隙が顕著に収縮し, 全体的により小さな間隙径分布となっていく. 一方, 大阪湾粘土は, 京都粘土に比較して, 全体的な間隙径の収縮は生じにくい. 最大圧密圧力 (<i>p</i>=10MPa) において比較すると, 京都粘土の間隙径は, 大阪湾粘土のものよりもかなり小さくなる. この違いは, 珪藻類を含めたマクロ的な粘土構成物自体の相違によるものと考えられる.

The difference in microstructure of two Pleistocene clays is studied. Osaka bay clay and Kyoto clay consist of the same minerals, belonging to the Osaka Group (Osaka bay clay is Ma11, and Kyoto clay is Ma4). According to the series of observation by SEM, it is known that the content of Diatom of Osaka bay clay is much larger than that of Kyoto clay. The change of micro pore size distribution due to one-dimensional consolidation was studied by a mercury intrusion porosimeter. The pore size distribution of Kyoto clay changed sensitively with the increment of consolidation pressure, however, in the case of Osaka bay clay, the change was not so clear as Kyoto clay. In the final consolidation pressure of 10MPa, the pore size of Kyoto clay was smaller than 0.1μm, while that of Osaka bay clay ranged between 0.01μm and 0.3μm. The reason of this difference is related with the content of microfossils such as Diatoms.

Journal

  • Doboku Gakkai Ronbunshu

    Doboku Gakkai Ronbunshu 701, 331-341, 2002-03-21

    Japan Society of Civil Engineers

References:  17

Cited by:  2

Codes

  • NII Article ID (NAID)
    10008001874
  • NII NACSIS-CAT ID (NCID)
    AN10014020
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    02897806
  • NDL Article ID
    6100884
  • NDL Source Classification
    ZN1(科学技術--建設工学・建設業)
  • NDL Call No.
    Z16-6
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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