Study on attenuation characteristics of elastic wave in different types of rocks
IU Xiling1，2，CUI Jiahui1，2，LI Xibing1，2，LIU Zhou1，2
(1. School of Resources and Safety Engineering，Central South University，Changsha，Hunan 410083，China； 2. Hunan Key Laboratory of Resources Exploitation and Hazard Control for Deep Metal Mines， Central South University，Changsha，Hunan 410083，China)
The attenuation characteristics of elastic wave propagation in granite，marble，red sandstone and limestone were studied by a PCI–2 systemthough the broken lead test. The results showed that：the amplitude and frequency of the elastic wave signals on the four kinds of rocks are decreasing with the increased sourcedistance. On granite and red sandstone，the attenuation of amplitude and centroid frequency are obviously characterized by stages，the attenuation coefficient is larger in rapid attenuation stage and smaller in slower attenuation stage，correspondingly，the peak frequency is higher in rapid attenuation stage，and dramatically reduced in slower attenuation stage.However，the attenuation of amplitude and centroid frequency on marble and limestone is relatively moderate，and the peak frequency maintains at 120 kHz.By analyzing the microstructure of four kinds of rocks and their attenuation characteristics，it is found that the most important factor causing the attenuation of the elastic wave is the tightness of the mineral particles in rock，and secondly the development degree of internal structure is another factor influencing attenuation. Furthermore，the quality factor Q of different rock is highly related with its wave impedance，the lower wave impedance rock has smaller Q value，corresponds to higher wave attenuation.
刘希灵1，2，崔佳慧1，2，李夕兵1，2，刘 周1，2. 不同类型岩石中弹性波衰减特性研究[J]. 岩石力学与工程学报, 2018, 37(S1): 3223-3230.
IU Xiling1，2，CUI Jiahui1，2，LI Xibing1，2，LIU Zhou1，2. Study on attenuation characteristics of elastic wave in different types of rocks. , 2018, 37(S1): 3223-3230.
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2018, Vol. 37 
