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借助于颗粒离散元程序PFC对单轴压缩作用下的煤岩数值模型进行了声发射及损伤演化特性分析,并基于声发射累积次数建立了损伤演化关系模型。研究结果表明,通过对不同阶段的声发射规律进行监测分析,能够为煤岩内部细观裂纹的萌生、扩展及贯通过程的预测提供参考;煤岩的损伤过程大致可分为未损伤、损伤稳定发展和损伤迅速发展3个阶段,并且与煤岩的宏观变形破坏过程存在较密切的对应关系。
The characteristics of acoustic emission and damage evolution of coal and rock under uniaxial compression are analyzed by means of particle discrete element program PFC, and the damage evolution relation model is established based on the cumulative number of acoustic emission. The results show that the monitoring and analysis of acoustic emission law at different stages can provide references for the initiation, propagation and propagation of mesocosm in coal and rock. The damage process of coal and rock can be roughly divided into non-damage and stable damage Rapid development and damage the three stages, and the macroscopic deformation and destruction of coal and rock there is a close correlation between the process.