緩亀裂進展による圧縮破壊―岩盤内の均質化亀裂進展（第５報）―

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タイトル別名
  • Compressive Fracture by Sub-critical Crack Growth-Homogenized Crack Propagation in Rock (5th report)-
  • カンキレツ シンテン ニ ヨル アッシュク ハカイ ガンバンナイ ノ キンシツカ キレツ シンテン ダイ 5ホウ
  • Homogenized Crack Propagation in Rock (5<SUP>th</SUP> report)
  • 岩盤内の均質化亀裂進展 (第5報)

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Compressive fracture process of rock under the uni-axial compression is discussed, as a result of the sub-critical crack growth in it. A numerical procedure for the failure prediction is presented and discussed, basing upon the critical pressure-crack elongation curve (pc - a curve) for the pure mode I crack propagation (KII = 0, KI = KIC) in the homogenized joint model, which is analyzed by means of the Stress Compensation-Displacement Discontinuity Method (SC-DDM). The crack elongation rate (da/dt) is formulated by the empirical equation of the form of da/dt ∝ KIn, where n: the sub-critical crack growth index. The applied stress-crack elongation curve (p - a curve) in the uni-axial compression test is analyzed to clarify the strain rate dependency of the macroscopic compressive strength (Sc), and the time-crack elongation curve (t - a curve) in the creep test of the uni-axial compression is analyzed to evaluate the effect of applied stress upon the lifetime (tF). It is concretely shown that the non-linearity of stress-strain curves and time-strain curves is deeply associated with the sub-critical crack growth in rock. Moreover the significant influence of heterogeneity and in-homogeneity of rock is discussed by presenting a parallel plate model to assess the damage effect and so on.

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  • 資源と素材

    資源と素材 124 (1), 7-19, 2008

    一般社団法人 資源・素材学会

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