【摘要】 利用岩石力学试验机和PAC声发射信号采集系统对冲击倾向性煤样进行了单轴压缩声发射测试,研究了其变形破坏过程中的声发射能率及b值的动态变化特征。试验结果表明,冲击倾向性煤样和无冲击倾向性煤样的声发射能率活跃点分别为峰值应力的90%和50%,声发射能率特征体现了冲击倾向性的本质,煤样破坏前声发射b值可以作为冲击倾向性煤样失稳破坏的前兆信息。更多还原

【Abstract】 Applying rock mechanics testing machine and PAC acoustic emission collection system to making acoustic emission test of coal samples with bursting liability under uniaxial compress condition,dynamic variation of acoustic emission energy ratio and b value during deformation and damage period was researched.Test results showed that acoustic emission energy ratio active point of coal sample with burst liability was 90% of peak stress and that of sample without burst liability was 50%.Acoustic emission energy ratio reflected burst liability’s essence,so acoustic emission b value could be treated as premonition information of coal sample damage.更多还原