低围压和疲劳载荷下砂岩的波速、模量及疲劳损伤(I):岩石的声学特性
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摘要
在温度为室温至125℃、围压为30 MPa、轴压为40.7 MPa、正弦波频率为0.05～5 Hz、正弦波振幅为5.1 MPa条件下进行了三轴动载疲劳实验。实验结果说明:弹性波速度VP,VS和杨氏模量E随温度的升高先下降而后升高,随频率对数的增高而增高,具有频散效应;波速比随温度升高波动大,无规律可循,随频率升高明显下降。这些可作为地震或其他疲劳损伤的前兆。
Triaxial dynamic fatigue tests are conducted on sandstone under temperature of 30℃～125℃,confining pressure of 30 MPa and axial pressure of 40.7 MPa,with sine-wave frequency 0.05～5 Hz and its amplitude of 5.1 MPa. The results indicate that elastic wave velocities VP,VS and Youngs modulus E of sandstones are all decreased and then increased with temperature,and they display strong dispersion effect with frequency. There exists a large variation of velocity with temperature and frequency, which can be applied as the omens of earthquake or fatigue damage.
Triaxial dynamic fatigue tests are conducted on sandstone under temperature of 30℃～125℃,confining pressure of 30 MPa and axial pressure of 40.7 MPa,with sine-wave frequency 0.05～5 Hz and its amplitude of 5.1 MPa. The results indicate that elastic wave velocities VP,VS and Youngs modulus E of sandstones are all decreased and then increased with temperature,and they display strong dispersion effect with frequency. There exists a large variation of velocity with temperature and frequency, which can be applied as the omens of earthquake or fatigue damage.
引文
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2Tutunc uAN,Podi oAL,Gregor yAR, etal.Nonline arviscoelast icbehavi or ofsedimenta ryrocks,part :effe ct offrequen cya ndstra inamplitude[J].Geophysics,1998,63(1):184～194
3John sonPA,Rasolofos a onPNJ.Nonlinear-elasti cit yandstr ess-ind ucedanisot ro pyinrock[J].Geophysics,1996,101(B2):3113～3124
4席道瑛,陈林,张涛.砂岩的变形各向异性[J].岩石力学与工程学报,1995,14(1):49～58
5Z atsepinSV,Cram pinS.Theme tastablepore- rea ctiveandinteractiver ockmass:ani sotropicpore-elasticity[A]. In:Proc.of65thAnn. Int.,SEGMeetin g[C].[s .l.]:[s.n.],1995,918～921
6Sayer sCM,Ebrom DA.Seismic travelti mea nalysisfora zimuthallya nisotropicme tia :theoryandexperiment[J].Geophysics,1997,62(5):1570～1582.
7刘斌,王宝善,席道瑛等.水饱和裂纹对地壳岩样中地震波速及各向异性的影响[J].地球物理学报,1999,42(5):702～710
8PeacockS,Cramp inS,Dav idCM .Shearwav es plittin gintheA wzaseismicgap,SouthernCaliforni a:temporal va riations aspossibleprecursors[J].J.Geophys.Res.,1998,93:3339～3356
9Castag naJP,SwanHW .Frame workforA VOg radientan dinterceptinterpretation[J].Geophysics,1998,63:948～956
10NurA.Dila tancy,pore fluids,andp remonitory va riati onsoft s/tptraveltimes[J].Bull.Seis.Soc.Am.,1972,62:1217～1222
11SpencerJ W,NurA. Th eeffectsofpressure,tempe ratu re,an dp orewateron velocities inWasterlygranite[J].J.Geophys.Res.,1976,81(B1):899～ 904
12Sa msMS, NeepJP.Them ea surement ofvelocity dis persionandfrequency -dependen tintrinsica tt enuationins edimentaryrock[J].Geophysics,1997,62(5):1456～1464
13WinklerKW. Dis persiona nd analysis ofv elocityanda ttenuat ioninBereasandstone[J].J.Geophys.Res.,1985,90:6793～68 00
14GrantA Gist.F lu ideffect onv elocityanda tt enuationinsandstone[J].J.Acout.Soc.Am.,1994,96(2):1158～1173
15席道瑛,易良坤,马勇等.砂岩中孔隙流体的黏性与衰减、模量和速度色散[J].石油地球物理勘探,1999,34(4):420～425
16席道瑛,程经毅,易良坤等.饱和砂岩中衰减、模量和速度的流体效应[J].石油物探,1999,38(3):45～491
17席道瑛,易良坤,张程逺.Biot理论的唯象修正对P波特性的影响[J].岩石力学与工程学报,(待刊)
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