论文部分内容阅读
The effect of structural discontinuities on the progressive failure process of anisotropic rocks should be paid particular attention.The crack damage stress σ_(cd),also considered as the yield strength,and the relationship between σ_(cd) and the uniaxial peak strength σ_(ucs) of anisotropic rocks for different orientations 8 of the isotropy planes with respect to the loading directions were investigated theoretically and experimentally.A theoretical relation of σ_(cd)/σ_(ucs) with the function of the shape parameter m was established.Additionally,uniaxial compression tests of shale samples were conducted for several inclinations θ.The test result of σ_(cd)/σ_(ucs) was close to the theoretical value for a given orientation.Furthermore,both experimental results and theoretical solutions of σ_(cd)/σ_(ucs) were independent of the inclination θ while σ_(cd) andσ_(ucs) were strongly affected by θ.The strength ratio σ_(cd)/σ_(ucs) may therefore be an intrinsic property of anisotropic rocks and could be used to predict the failure of rock samples.
The effect of structural discontinuities on the progressive failure process of anisotropic rocks should be paid particular attention. The crack damage stress σ_ (cd), also considered as the yield strength, and the relationship between σ_ (cd) and the uniaxial peak strength σ_ ( ucs) of anisotropic rocks for different orientations 8 of theotropy planes with respect to the loading directions were investigated theoretically and experimentally. A theoretical relation of σ_ (cd) / σ_ (ucs) with the function of the shape parameter mwas established.Additionally , uniaxial compression tests of shale samples were conducted for several inclinations θ. The test result of σ_ (cd) / σ_ (ucs) was close to the theoretical value for a given orientation. Future and both experimental results and theoretical solutions of σ_ (cd ) / σ_ (ucs) were independent of the inclination θ while σ_ (cd) andσ_ (ucs) were strongly affected by θ.The strength ratio σ_ (cd) / σ_ (ucs) may therefore be an intrinsic property of anis otropic rocks and could be used to predict the failure of rock samples.