Experimental Study On Influential Factors Of Acoustic Emission Location Accuracy Of Rock Under Stresses

For brittle rock,the rock failure process is consistent with its internal microcracks evolution.The generation and expansion of microcrack accompanied by rapid release of the elastic wave and propagates within the rock.That is acoustic emission.Acoustic emission signals need the help of specialized equipment to be monitored and using multiple acoustic emission transducers can locate the position of the acoustic emission.The real-time detection accuracy of AE signals is affected by the physical properties of rock,the mode of external load,and the geological environment conditions,.For now,accuracy of acoustic emission location is poor.For this reason,this paper uses the laboratory lead breaking test and analysis method with two different typical external load modes of uniaxial compressive load and single shear load.The system should carry out experimental study and analysis on acoustic emission source 3D positioning with different stress level of sandstone and different acoustic velocity in order to explore the relationship with the localization accuracy of AE and the stress level and the acoustic velocity variation rule.It has important theoretical and practical value on more precise information on the inversion of acoustic emission sources.?Use the PCI-2 type of acoustic emission testing system with AG-I 250kN to carry out the lead-off location emission test on sandstone under different stress levels in uniaxial compression test.Discuss on the regulation of the location accuracy of specimens and analysis the influence of different stress level.?Carry out lead-off location emission tests under different acoustic velocity in uniaxial compression test.Discuss on the velocity effect on the location accuracy and discuss on the regulation of the location accuracy of specimens and analysis the influence of different acoustic emission.? Use the PCI-2 type of acoustic emission testing system with the single shear test system for coal and rock independently developedto carry out the lead-off location emission test on sandstone under different stress levels in single shear load.Discuss on the regulation of the location accuracy of specimens and analysis the influence of different stress level.? Carry out lead-off location emission tests under different acoustic velocity in single shear load.Discuss on the velocity effect on the location accuracy and discuss on the regulation of the location accuracy of specimens and analysis the influence of different acoustic emission.