永川煤矿T3xj4砂岩声发射特性及Felicity效应研究

在单轴和循环加载条件下对永川煤矿砂岩损伤破坏全过程的声发射特性进行了系统研究,结果表明:砂岩声发射类型与MOGI-I相似,应力应变全过程曲线对应的Kaiser点、屈服点及峰值点处声发射信号明显;随着循环加载水平的增加,不同轴向应力和轴向应变阶段对应的Felicity效应比值越来越小,反映了岩石损伤程度的增加。

Study on Acoustic Emission Characteristics and Felicity Effect of T3xj4 Sand Rock of Yongchuan Coal Mine

Acoustic emission characteristics of damage and failure process of Yongchuan Coal Mine sand rock under uniaxial pressure and cyclic loading were studied,the results show that sand rock is similar to MOGI-I in acoustic emission characteristics,the acoustic emission signal was obvious in Kaiser point,yield point and peak point of the complete stress-strain process curve;The ratio of Felicity effect under different axial pressure and strain stage was smaller and smaller when the level of cyclic loading was higher and higher,which mean that the damage degree of the sand rock was higher and higher.