Comparing the effectiveness of energy and hit rate parameters of acoustic emission for prediction of rock failure
In this paper the results of a study on two main acoustic emission (AE) parameters – hit rate and energy- measured in laboratory on rock samples prior to failure are presented. Uniaxial test were carried out on Lavasan granite specimens, dimensions 45 mm diameter and 100 mm height, using a servo–controlled compression device with a constant rate of displacement. Four transducers were used for monitoring the acoustic emissions during loading. Acoustic emission event-hit data were recorded continuously until the failure of the specimens. Axial and radial deformations have also been measured by electric resistance gauges. Plotting of accumulated hit and the accumulated absolute energy versus time shows the absolute energy is a more appropriate parameter to monitor crack propagation and to predict catastrophic failure of specimens than the conventional AE’s hit. By comparing the AE steps with volumetric deformation, we found that AE energy show definitively each steps of deformation that presented by Bieniawski (1967).
Acoustic emission parameters Uniaxial compression test Lavasan granite Failure prediction
M.Keshavarz F.L.Pellet K.Amini Hosseini
University Joseph Fourier, Laboratory 3S-R, France International Institute of Earthquake Engineering and Seismology, Iran
国际会议
香港
英文
1-5
2009-05-19（万方平台首次上网日期，不代表论文的发表时间）