Experimental Study on the Charge Signal Time-Frequency Characteristics during Fracture Process of Precracked Syenogranite under Uniaxial Compression

During the process of rock deformation and failure, a significantly large number charge signals are generated as result fracture appearance crack expansion. The generation signal is comprehensive embodiment coal-failure behavior. study in fractured-rock failure great significance to prediction dynamic disasters such tunnel-engineering stability, slope instability earthquake. In this work, surveillance system utilizing induction employed extract precursory information related precracked syenogranite. results reveal significant influence fractures on strength syenogranite specimens charge-induction events. position dip angle. Furthermore, with increase inclination, events amplitude power value charge-induced reach maximum instability-failure phase. specimen has relatively value, medium correlation, or even high correlation phase rack propagation, which can make an early warning risk syenogranite; degree, values correlations gradually increases.