煤巷围岩冲击矿压震动效应的爆破类比试验研究

Blasting analogical experiment study on the vibration effects of rock burst in coal roadway

通过煤矿地下原位巷道爆破类比试验,应用TDS-6微震信号数据采集试验系统,研究了冲击震动波对煤层巷道围岩的作用效应和不同区位响应特征的差异。试验结果表明:①随着与震源距离的增大,震动波能量呈指数关系E=E0e-ηl衰减,初始震动相对剧烈但衰减很快,大约20 m后幅度明显降低,到30 m后变得非常微弱;②煤巷围岩介质同一截面不同区位对冲击震动波响应特征差异较大,底板受到震动影响最强烈,两帮受到的震动影响次之,顶板和肩窝受到的震动影响最小。可见,冲击震动只对震源相对较近的煤岩产生损伤破坏效应,对远场介质破坏作用不大;巷道同一断面不同区位围岩对冲击震动波的响应有较大区别,应分别对待。

Using TDS-6 microseismic monitoring system, through the in-situ blasting analogical test in roadway, the ac- tion effects of shock wave on roadway surrounding rock and the response characteristics in different sections were stud- ied. The results show that： ① The shock wave attenuates exponentially as E = E0ewith the distance increase to seis- mic source, that is, the explosion shocks violently at the beginning and attenuates quickly, the amplitude decreases sig- nificantly after 20 meters and becomes very weak after 30 meters ; ② The response characteristics of roadway surround- ing rock differ significantly in different locations of the same section, that is, the floor is suffered most seriously, the two sides take the second place, and the roof and the humeral angles are the worst. It shows that rock burst just have de- structive effect on the coal rock near to the seismic source, and on the same section but different locations the charac- teristics of the response to the shock wave in roadway surrounding rock is different.