Abstract
Based on conventional triaxial compression tests for phyllite with various orientation angles, the relationships of mechanical features, confining pressure and anisotropy are discussed. The results indicate that the peak strength, residual strength, elastic modulus and Poisson’s ratio increase with increasing confining pressure. The effect of confining pressure on the elastic modulus is relatively smaller than the peak strength and Poisson’s ratio. The peak strength and Poisson’s ratio decrease with orientation angle increases. The effect of anisotropy on the peak strength is larger than Poisson’s ratio. The split and shear mechanisms are observed, their failures are brittle and ductile, respectively. The three modes of surrounding rock failure in deep tunnel are derived from the test results, which are split and buckling, split and shear, shear sliding.
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