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 . According to the theory of critical point, the energy will accelerate the release of energy (AER) before the occurrence of a large earthquake or the destruction of brittle materials such as rock, which is a power law. In this paper, through large-scale rock burst acoustic emission experiment, The critical phenomena were studied.Experiments were conducted using three kinds of rock specimens respectively, and different axial compression loading history and triaxial stress state were achieved. Acoustic emission technique was used to record the elastic energy released during the generation and propagation of microcracks The experimental results confirm the critical point theory, under different experimental conditions, the elastic properties of rock materials can be obviously accelerated and released before the compression failure.A preliminary study on the prediction of medium-term earthquakes using AER is also carried out.