两类三轴实验花岗岩的微破裂对比研究

COMPARATIVE STUDIES OF MICROCRACKS IN GRANITE SAMPLES IN TWO TRIAXIAL EXPERIMENTS

  • 摘要: 用显微镜对三轴实验后,稻田花岗岩样品内部的微破裂进行了观测.对比了两类三轴实验的微破裂,一种是常规三轴实验(1>2=3),另一种是真三轴实验(1>2>3).观测表明,茂木清夫在真三轴实验中发现的脆性岩石体积膨胀的各向异性效应是由微破裂的各向异性引起的,从而阐明了这一效应的微观机制,并对中等主应力引起的膨胀和微破裂的各向异性效应在地震研究中的意义进行了初步探讨.

     

    Abstract: The microcracks in samples of Inada granite after triaxial experiments were examined by microscope. The microcracks in two types of triaxial experiments, covention-al triaxial (1>2 = 3) and true triaxial (1>2>3) were compared. The observation showed that the anisotropic dilatancy effect of brittle rocks as revealed by K. Mogi in true triaxial experiment was caused by aiiisotropic microcracks in rocks, thus indicating its microscopic nature. The effect of anisotropie dilatancy and anisotropic microcracks caused by the principal stress of intermediate magnitude with regard to earthquake studies was preliminarily discussed.

     

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