SWELLING CHARACTERISTICS OF SAND-BENTONITE MIXTURES UNDER ONE-DIMENSINONAL STRESS

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  • CUI Hongbin
    社団法人土木学会 名古屋工業大学大学院社会工学専攻
  • SUN De'an
    社団法人土木学会 名古屋工業大学大学院社会工学専攻
  • MATSUOKA Hajime
    社団法人土木学会 名古屋工業大学大学院社会工学専攻
  • XU Yongfu
    上海交通大学建築工程与力学学院

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  • ベントナイトと砂との混合材の一次元的な浸水変形特性
  • ベントナイト ト スナ ト ノ コンゴウザイ ノ 1ジゲンテキ ナ シンスイ ヘンケイ トクセイ

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Abstract

Based on the concept that the maximum water volume absorbed by unit volume of montmorillonite is constant, the swelling deformation of sand-bentonite mixtures is uniquely characterized using the void ratio of montmorillonite, which is defined by the ratio of water volume to montmorillonite volume. The relationship between the montmorillonite void ratio and overburden pressure at fully swelling is independent of the initial compaction condition and the sand-bentonite mixture ratio, and is a linear line in their log scale. When overburden pressure is large enough and/or the bentonite ratio of the mixture is small, the measured plots deviate from the line. A method for predicting the limited overburden pressure which is linearly correlated with the montmorillonite void ratio is proposed and verified using the concept of the skeleton void ratio.

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