Variation in Permeability by Consolidation of Fractured Rocks

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  • 破壊後の圧密による岩石の透水性変化に関する研究
  • ハカイ ゴ ノ アツミツ ニ ヨル ガンセキ ノ トウスイセイ ヘンカ ニ カンスル ケンキュウ

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Abstract

EDZ (Excavatin Damaged Zone) may appear around underground repositories. Permeability of rock mass in EDZ would be greater than that of surrounding rock mass and sealability of rock mass would be deteriorated. Countermeasures for the sealability deterioration would induce increase in construction and maintenance costs. However, if sealability recovers with time under pressure, the costs would be reduced. The objective of this study is to clarify whether sealability recovery of clastic rocks exists or not. To accomplish the objective, Kimach sandstone, Toyotomi siliceous mudstone and Inada granite were fractured under triaxial compressive stress state and consolidated in the residual strength state. Hydraulic conductivity increased with failure and decreased by the consolidation to 0.3-0.6 times that just after failure or 0.9-1.5 times that before axial loading for Kimachi sandstone. Similar results were obtained for Toyotomi siliceous mudstone where the ratios were 0.4 and 0.6. Ratios for Inada granite were 0.2 and 16. These results mean that a strong sealability recovery was confirmed for the clastic rocks and a weak sealability recovery for Inada granite.

Journal

  • Journal of MMIJ

    Journal of MMIJ 128 (4_5), 163-172, 2012

    The Mining and Materials Processing Institute of Japan

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