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結晶質岩を対象とした長期岩盤挙動評価のための理論的研究; 2009年度(委託研究)

Theoretical study of rock for estimating long-term behavior; FY2009 (Contract research)

市川 康明*; Choi, J. H.*; 丹野 剛男; 平野 享*; 松井 裕哉

Ichikawa, Yasuaki*; Choi, J. H.*; Tanno, Takeo; Hirano, Toru*; Matsui, Hiroya

結晶質岩の長期挙動を解明するために、古典破壊力学理論を総括し、破壊靱性値以下の荷重状態においても亀裂が進展して破壊に至る亜臨界亀裂進展を取り上げて、力学・化学連成現象の観点からその原因を考察し、花崗岩の長期挙動における亜臨界亀裂進展現象について考察を加えた。また、亜臨界亀裂進展現象の主たる要因である圧縮応力下におけるケイ酸塩鉱物の化学的な溶解現象について、実験室でその現象を再現し、現象の理解を試みた。さらに、これまでの研究内容を総括するとともに、実験結果をもとに、温度溶液(pH)・固体圧力と溶液の間隙水圧を変数とした石英に対する溶解速度式を提案した。

We first surveyed the classical theories of fracture mechanics, and discussed the subcritical crack growth (SCG), which is observed under less load than the fracture toughness Kc. This SCG is a result of coupled mechanical and chemical effect. The SCG for granite was treated on this basis. We performed pressure dissolution experiments using specimens of single crystal quartz, since the dissolution reaction is engaged with a deformation and failure process of polycrystalline rock. The series of experiments were managed by a flow-through type changing temperature, pH and applied stress. Si concentrations we here measured. We first surveyed the theories of pressure solution. Then we proposed a theory of saluting velocity of quart which accounts for the effects of temperature, chemical (pH), solid pressure and pore pressure.

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