【摘要】 按照临界点理论 ,在大地震或岩石等脆性材料破坏发生之前能量会加速释放 (AER) ,这种加速过程呈幂律变化 (power law) .本文通过大尺度岩石破裂声发射实验 ,对这一临界现象进行了研究 .实验分别采用 3种岩石试件 ,并且实现了不同轴压加载历史以及三轴应力状态 ;实验利用声发射技术记录了微裂纹产生和扩展时所释放的弹性能 (声发射 ) ;实验结果证实了临界点理论 ,在不同的实验条件下 ,岩石材料在受压破坏之前弹性能会出现明显的加速释放过程 .本文还对使用AER预测中期地震进行了初步研究 .更多还原

【Abstract】 According to the critical point hypothesis (CPH), energy release would accelerate in power law before occurrence of large earthquakes or failure of brittle materials. In the paper, CPH was studied by acoustic emission experiments of large-scale rock samples. Three kinds of rock samples were used in the experiments. The tri-axial loading condition was applied under different loading histories. The released elastic energy (Acoustic emission) was recorded with acoustic emission technique as microcracks emerged and developed inside the rock samples. The experimental results gave a further verification on the CPH. The elastic energy release of rock samples would accelerate before the failure even under different experimental conditions. Primary studies were also made on medium-term earthquake prediction by using accelerating energy release (AER) in the paper.更多还原