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用几种不同加载方式对岩石样品进行了单轴压力实验。以恒定应变率(约为10~(-5))对样品加载时,岩石的破裂过程大致可分成四个阶段:孔隙压缩阶段、弹性变形阶段、体积膨胀阶段和临震阶级。后二个阶段显著的特点是岩石开始表现出非弹性的体积应变并在主破裂前急剧增大,它与微破裂累积总数二者存在着同步的变化。在重复加载时,发现岩石的微破裂过程具有不可逆的性质,这种现象似乎可以用来说明同一地区短期内发生的两次地震的地震序列的不同,指出运用历史地震资料时应注意该地区应力变化的历史情况。
Rock samples were subjected to uniaxial pressure tests using several different loading methods. When the sample is loaded at constant strain rate (about 10 -5), the rupture process can be divided into four stages: pore compression stage, elastic deformation stage, volume expansion stage and immiscibility class. A striking feature of the last two stages is that the rock begins to exhibit inelastic volumetric strain and sharply increases before the main rupture, with simultaneous changes in both the cumulative total micro-rupture. During repeated loading, the irreversible nature of the micro-rupture of rocks was found. This phenomenon seems to be used to illustrate the difference in the seismic sequences of the two earthquakes occurring in the same area in the short term. It is pointed out that the use of historical seismic data should pay attention to the stress in the area History of change.