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1988: THE VARIATION OF WAVE VELOCITY BEFORE RUPTURE OF SAMPLES COMPOSED OF ROCKS WITH DIFFERENT PROPERTIES. Acta Seismologica Sinica, 10(4): 437-443.
Citation: 1988: THE VARIATION OF WAVE VELOCITY BEFORE RUPTURE OF SAMPLES COMPOSED OF ROCKS WITH DIFFERENT PROPERTIES. Acta Seismologica Sinica, 10(4): 437-443.
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THE VARIATION OF WAVE VELOCITY BEFORE RUPTURE OF SAMPLES COMPOSED OF ROCKS WITH DIFFERENT PROPERTIES

  • Institute of Geophysics, State Seismological Bureau

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  • Published Date: September 01, 2011
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  • The variation of wave velocity before rupture of samples composed of rocks with different properties was studied by the ultrasonic impulse method. The samples were rectangular plates of marble, in whose centre circular disks of marble, gabbro, granite and sandstone were inlaid. The experiments show that when the samples rupture the cracks extend through the rock disks with low strength, but round the rock disks with high strength. For the first group of samples the wave velocity in the inlaid rock disks varies visibly before rupture, while for the second group the wave velocity in the inlaid rock disks does not vary very much. Measurements of wave velocity through the interface between two rocks show that the wave velocity begins to decreas when the compression stress reaches 60% of rupture stress of the sample. The tendency of decrease of wave velocity before rupture of the samples is not monotonous, but it undulates. This makes clear that the heterogeneity of the medium can produce important influence on the law of wave velocity variation before rock rupture.
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    • References (1)
  • [1] Nur, A.,aud G. Simmons, Stress——induced velocity anisotropy in rock:An experimental study, J Geophys. Rer.,1969, 74, 6667——6674.

    [2] Seya, K., I. Suzuki, and H. Fuyarna, The change in ultrasonic wave velocities in triaXtally stressed brittle rock, J. Phys. Earth., 1979, 27, 409——421.

    [3] O'Connel, R.J., and B.Budiansky, Seismic velocities in dry and saturated cracked solids, J Geophys. Res.,1974, 79,5412——5426.

    [4] Gupta, N.L, Seismic velocities in rock subjected to axial loading up to shear fracture,J. Geophys. Res, 1973, 78,6936——6942.

    [5] 高梧学、木下重教、西泽修、小出仁、千薰洋,真三轴压缩下てのウエスタリ——花岗岩の弹性波速度具方性について,地震,1984,37,1,67——79.

    [6] Nishizawa, O., Seismic velocity anisotropy in a medium containing oriented cracks——transversly isotropic case. Phys. Eamh., 198?, 30, 331——347.

    [7] 刘晓杠、赖德伦,影响波速异常的两种因素,地震学报,1986,8,50——56.

    [8] 刘晓扛,岩石裂缝扩展前波速异常的实验研究,地震,1986,3; 1——4,

    [9] 董颂声、黄才中、林命遗、周宝铮、孙庆煊、朱海林、陆振飞,利用人工波源探测震前波速变化,地震学报,1982,4,1——13

    [1] Nur, A.,aud G. Simmons, Stress——induced velocity anisotropy in rock:An experimental study, J Geophys. Rer.,1969, 74, 6667——6674.

    [2] Seya, K., I. Suzuki, and H. Fuyarna, The change in ultrasonic wave velocities in triaXtally stressed brittle rock, J. Phys. Earth., 1979, 27, 409——421.

    [3] O'Connel, R.J., and B.Budiansky, Seismic velocities in dry and saturated cracked solids, J Geophys. Res.,1974, 79,5412——5426.

    [4] Gupta, N.L, Seismic velocities in rock subjected to axial loading up to shear fracture,J. Geophys. Res, 1973, 78,6936——6942.

    [5] 高梧学、木下重教、西泽修、小出仁、千薰洋,真三轴压缩下てのウエスタリ——花岗岩の弹性波速度具方性について,地震,1984,37,1,67——79.

    [6] Nishizawa, O., Seismic velocity anisotropy in a medium containing oriented cracks——transversly isotropic case. Phys. Eamh., 198?, 30, 331——347.

    [7] 刘晓杠、赖德伦,影响波速异常的两种因素,地震学报,1986,8,50——56.

    [8] 刘晓扛,岩石裂缝扩展前波速异常的实验研究,地震,1986,3; 1——4,

    [9] 董颂声、黄才中、林命遗、周宝铮、孙庆煊、朱海林、陆振飞,利用人工波源探测震前波速变化,地震学报,1982,4,1——13
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