STUDY ON THE THEORETICAL EVALUATION OF GROUTING AREA AND EFFECTIVE POROSITY FOR FRACTURED ROCK MASSES

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  • NISHIGAKI Makoto
    社団法人土木学会 岡山大学環境理工学部環境デザイン工学科
  • MIKAKE Shin-ichiro
    社団法人土木学会 岡山大学大学院自然科学研究科 現 核燃料サイクル開発機構東濃地科学センター
  • KOMATSU Mitsuru
    社団法人土木学会 岡山大学環境理工学部環境デザイン工学科
  • KANKAM-YEBOAH Kwabena
    社団法人土木学会 岡山大学大学院自然科学研究科

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Other Title
  • 亀裂性岩盤におけるグラウトの注入範囲と有効間隙率の評価
  • キレツセイ ガンバン ニ オケル グラウト ノ チュウニュウ ハンイ ト ユウコウ カンゲキリツ ノ ヒョウカ

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An accurate evaluation of the grouting area in fractured rock is very important for designing the grouting pitch in the field. In this study, a method of determining the effective porosity and the grouting area of a three-dimensional (3-D) fractured rock mass are described. To evaluate the validity of this method, constant injection rate experiments were carried out in the laboratory. First, an experiment was performed on a gravel ground model. Then, a second experiment was performed on an axisymmetric cubic block model with gaps between the blocks mimicking fractures in rocks. The results obtained from the experiments agree well with proposed theory. The effect of gravity on high permeability fractured rock mass was also evaluated and the Hele-Shaw's seepage model was applied in explaining the laboratory results.

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