用于岩体质量评价的地震波Q值计算方法
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摘要
利用地震记录中的衰减信息(波形与频谱)计算岩体的品质因子(Q值),对岩体质量进行准确评价,典型的方法有振幅法、上升时间法、频谱比法、质心频率偏移法。本文介绍了这些方法的原理,并对它们的稳定性、适用情况做出了评价。
Based on the attenuation information(waveform and spectrum) in the seismogram,the seismic quality factor Q can be calculated for the rock mass.This paper presents some typical methods to compute the Q value to evaluate the rock mass quality.The methods include amplitude,rise-time, spectral ratio,and centroid frequency shift.The paper gives the principles of these methods,and discusses their stability and applicability.
Based on the attenuation information(waveform and spectrum) in the seismogram,the seismic quality factor Q can be calculated for the rock mass.This paper presents some typical methods to compute the Q value to evaluate the rock mass quality.The methods include amplitude,rise-time, spectral ratio,and centroid frequency shift.The paper gives the principles of these methods,and discusses their stability and applicability.
引文
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[2]Rainer Tonn.The determ ination of the seism ic quality factor Qfrom VSP data:A comparison of d ifferent computationalm ethods.Geophysical Prospecting,1991,(39):1~27.
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[8]You li Quan and JerryM.Harris..Seism ic attenuation tomographyusing the frequency sh iftm ethod.Geophysics,1997,63(3):895~905.
[2]Rainer Tonn.The determ ination of the seism ic quality factor Qfrom VSP data:A comparison of d ifferent computationalm ethods.Geophysical Prospecting,1991,(39):1~27.
[3]G ladw in M.T.and Stacey F.D..Anelastic degradation of acous-tic pu lses in rock.Phys.Earth P lanet.Inter,1974,8(3):332~336.
[4]D.P.B lair and A.T..Spath is,Attenuation of explosion-genera-ted pu lse in rock masses.JournalGeophysicalResearch,1982,87(B5):3885~3892.
[5]K jartansson E..Constant Q-wave propagation and attenuation.J.Geophys.Res.1979,82(B7):4737~4748.
[6]D.P.B lair and A.T..Spath is,Seism ic source influence in pu lseattenuation stud ies.Journal Geophysical Research,1984,89(B11):9253~9258.
[7]P.Tarif and T.Bourb ie..Experim ental comparison between spec-tral ratio and rise tim e techn iques for attenuation m easurem ent.Ge-ophysical Prospecting,1987,(35):668~680.
[8]You li Quan and JerryM.Harris..Seism ic attenuation tomographyusing the frequency sh iftm ethod.Geophysics,1997,63(3):895~905.
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