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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(6.9±2.1)×10~3焦耳/米~2逐步降到(0.6±0.5)×1O~3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.
The cylindrical specimens of marble were used to prefabricate the discontinuous cracks at an angle of about 30 ° to the axis and then the epoxy resin was used to observe the influence of the crack size and the filler on the shear fracture energy Cracking can be gradually reduced from (6.9 ± 2.1) × 10 ~ 3 Joules / m ~ 2 to (0.6 ± 0.5) × 10 ~ 3 Joules / m ~ 2 when area increases from 0 to 90% After sliding weakening mode, the theoretical stress drop obtained is almost unchanged, and the ratio between them and the measured stress drop gradually increases and reaches 10. At the same time, it analyzes that the stress drop at the time of earthquake and rock rupture varies greatly, and The reason why the breakage caused by different methods can have great difference is that the fault honeycomb contact may have a significant impact on the above problems.