许昭永, 包一峰, 李忠富. 1984: 裂缝尺度对剪切破裂能的影响. 地震学报, 6(3): 362-368.
引用本文: 许昭永, 包一峰, 李忠富. 1984: 裂缝尺度对剪切破裂能的影响. 地震学报, 6(3): 362-368.
XU ZHAOYONG, BAO YIFENG, LI ZHONGFUcom sh advance. 1984: THE EFFECT OF SIZE OF CRACK ON ENERGY OF SHEAR FRACTURE. Acta Seismologica Sinica, 6(3): 362-368.
Citation: XU ZHAOYONG, BAO YIFENG, LI ZHONGFUcom sh advance. 1984: THE EFFECT OF SIZE OF CRACK ON ENERGY OF SHEAR FRACTURE. Acta Seismologica Sinica, 6(3): 362-368.

裂缝尺度对剪切破裂能的影响

THE EFFECT OF SIZE OF CRACK ON ENERGY OF SHEAR FRACTURE

  • 摘要: 采用大理岩圆柱试样,与轴线约成30角预制不连续裂缝,再用环氧树脂胶接,以实验观测裂缝尺度及其填充物对剪切破裂能的影响.结果表明:当裂缝相对面积从0增加到90%时,破裂能从(6.92.1)103焦耳/米2逐步降到(0.60.5)1O3焦耳/米2;而使用 Knopoff方法和引入滑动弱化模式后的方法,求得的理论应力降几乎不变.它们与实测应力降的比却逐步增大并达到10.同时,分析了地震时和岩石破裂时的应力降差别很大,以及不同方法所得破裂能差别很大的原因,认为断层的蜂窝状接触对上述问题可能有重要影响.

     

    Abstract: This paper deals with an experiment on cylindrical marble samples in which artificial unlinked cracks making angles of about 30?with the cylindrical axis are cemented by epoxy resin. The effect of crack size and filling material on energy of shear fracture are studied experimentally. The results are that as the relative area of the cracks increases from zero to 90% the shear fracture energy decreases gradually from (6.92.1) 103J/m2 to(0.60.5)103J/m2. The theoretical values of stress drop obtained by Knopoff's method and the method of slip-weakening model are almost the same. However, the ratio of these values of stress drop to that observed experimentally increases gradually and reaches about 10 as the relative crack area increases from zero to 90%. At the same time, some possible factors causing the large difference of stress drop during earthquakes and rock failure and the large difference of values of shear fracture energy obtained by various methods, are discussed. It has been proposed that the effect of the honeycomb-contact structure of fault surfaces may be important.

     

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