岩石の透気特性および水理学的異方性に関する実験的研究

DOI Web Site 被引用文献4件 参考文献22件

書誌事項

タイトル別名
  • Laboratory Studies on Gas Permeability and Hydraulic Anisotropy of Rocks.
  • ガンセキ ノ トウキ トクセイ オヨビ スイリガクテキ イホウセイ ニ カンスル ジッケンテキ ケンキュウ

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抄録

Accurate determination of the permeability of hydraulically-tight rock at great depth is very important for the design and/or assessment of facilities associated with many kinds of underground utilization or exploitation. One of the promising ways to test a rock specimen having such low permeability is to use gas such as air as the permeant. Because the viscosity of air is much lower than that of water, air permeates through a hydraulically-tight specimen of rock more readily than water. In this study, we developed a new laboratory permeability test system. This system is capable of testing low permeability rocks either by the constant pressure air permeation test or by the constant-flow air permeation test under high confining pressure conditions that simulate ground pressures at depths. The system was used to test Shirahama sandstone and Inada granite, which are two types of rock widely available in Japan. In order to investigate the effects of anisotropy on rock permeability, specimens cored parallel to and perpendicular to bedding for sandstone, and specimens cored in the direction perpendicular to Rift Plane, Grain Plane and Hardway Plane for granite, were used. In addition, a series of test conditions were set so that the effects of test method, permeation or entrance pressure, specimen size and confining pressure on gas permeability of rocks can be assessed. Preliminary results of present study show that: (1) air permeation tests, especially the constant-pressure air permeation test can be effectively used to measure the permeability of a hydraulically-tight specimen of rock as low as that of granite; (2) the permeability of a rock specimen is a function of the confining pressure, it decreases monotonously with increase in confining pressure. Under the tested conditions with increment of confining pressure from 1MPa to 69MPa, the gas permeabilities of Shirahama sandstone and Inada granite ranged from 9.4×10-16 to 7.4×10-17 and 5.2×10-18 to 8.0×10-20 (m2), respectively; (3) Inada granite in particular appears to exhibit hydraulic anisotropy. The permeability in the direction perpendicular to Rift Plane along which major microcracks exist demonstrates the lowest value. In other words, the permeability in the direction along the plane of microcracks is higher than that in the direction perpendicular to the plane of microcracks.

収録刊行物

  • 応用地質

    応用地質 41 (4), 210-217, 2000

    一般社団法人 日本応用地質学会

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