間隙水圧・変形連成問題への最近の取り組み　　花崗岩を起源とする断層ガウジの剪断強度および水理特性

DOI Web Site 被引用文献2件 参考文献10件

書誌事項

タイトル別名
  • Frictional Strengths and Fluid-Flow Properties of Granite-Origin Fault Gouges
  • 花崗岩を起源とする断層ガウジの剪断強度および水理特性
  • カコウガン オ キゲン ト スル ダンソウ ガウジ ノ センダンキョウド オヨビ スイリ トクセイ

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抄録

Two effects of clay enrichment in the granite-origin fault zone due to the deformation were studied: (1) it reduces frictional strength and (2) it impedes across-fault fluid flow. We sampled two natural fault rocks located in and out of the aftershock region of 2000 Tottori-ken Seibu Earthquake (Tottori, Japan) , and measured the porosity, permeability and friction coefficient for each gouge zone. Independent of the sampling location and the difference of aftershocks' activities, the deformation concentrated gouge zone showed the lowest porosity in the specimen. The pore in the gouge with the lowest porosity was dominated by smaller sized pore throat (around 10 nm) caused by the enrichment of fine-sized clay minerals, such as smectite. Sliding deformation with permeability monitoring on natural gouges, using the pore pressure oscillation method, were performed along a 30° precut surface of Berea sandstone under 100 MPa of normal stress, 30 MPa of pore water pressure and room temperature condition. The gouges having the lowest porosity showed the lowest friction coefficient and the lowest permeability in the fault rocks. Thus both the frictional and fluid flow properties of natural gouges would be controlled by the clay mineral content. The relationship between the friction coefficient and the permeability on the natural fault gouge draws a similar trend to the previous study on simulated gouges with various mixes of smectite powder and granular quartz, but the trend for the natural fault gouge indicated c.a. 0.1 lower friction than that for the previous study.

収録刊行物

  • 資源と素材

    資源と素材 127 (3), 165-168, 2011

    一般社団法人 資源・素材学会

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