地下き裂の振動特性に及ぼすき裂先端からの流体の漏れの影響 : 二次元き裂を用いた解析

概要

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Dynamic response of a reservoir crack with fluid leakage at the crack tip is studied by using a two-dimensional fluid-filled crack in an elastic medium, i.e. a rock mass. We use Darcy's law for describing fluid leakage at the crack tip. It is revealed that the eigen angular frequencies become smaller with increasing fluid leakage at the crack tip. It is also revealed that attenuation becomes stronger with increasing fluid leakage. However, for fluid leakage exceeding a certain level, the situation is opposite, i.e., attenuation becomes weaker with increasing fluid leakage. These effects of fluid leakage on the eigen angular frequencies are stronger for the larger interfacial stiffness due to contact between the asperities on the upper and lower crack surfaces. They are also weaker for larger ratio of the crack length to the initial aperture of the crack.
社団法人日本機械学会の論文
2001-10-25