高应力状态下大理岩受异源扰动声发射响应研究

Study on Acoustic Response of Marble under High Stress and Disturbance

为探究大理岩在异源动力作用下的声发射能量与裂隙发展规律,对大理岩进行了不同单轴应力比与不同扰动幅值的正交试验,结果表明:单轴高应力比下动态扰动对岩石的损伤进程起到了促进作用,辅以声发射能量数可知在岩样动态扰动破坏的瞬间伴随有巨大的能量释放,且累积声发射数能量同样呈三阶段变化趋势,而后对声发射裂隙点定位图与岩样宏观破坏结合观察,发现动态扰动时损伤从岩样中部与表面开始而后继续延伸,造成岩样最后劈裂破坏。

In order to explore the acoustic emission energy and crack development law of marble under the action of heterogeneous dynamics,orthogonal experiments with different uniaxial stress ratios and different disturbance amplitudes have been carried out on the marble.The results show that:dynamic disturbances under uniaxial high stress ratios.It plays a role in promoting the damage process of the rock.Supplemented by the acoustic emission energy number,it can be seen that there is a huge energy release at the moment of dynamic disturbance and destruction of the rock sample,and the cumulative acoustic emission number energy also shows a three-stage change trend,and then the acoustic emission cracks.The combined observation of the point location map and the macroscopic failure of the rock sample showed that the damage started from the middle and the surface of the rock sample and then continued to extend during the dynamic disturbance,causing the rock sample to split and fail at the end.