• OpenAccess
  • Assessments of Elastic Anisotropy of Banded Amphibolite as a Function of Cleavage Orientation Using S- and P-Wave Velocity  [ICGG 2015]
  • DOI: 10.4236/gep.2015.35008   PP.62 - 71
  • Author(s)
  • Ali Esamaldeen, Guang Wu, Mohamed Nuha
  • As most rocks are of an anisotropic nature, the measurement elastic modulus of anistropic rocks is of general interest. Nevertheless, uniaxial compression test is common method to measure the dynamic elastic constants of anisotropic rocks; the use of ultrasonic pulse test is attractive, because the test is non-destructive and easy to apply. This study aimed to demonstrate the influence of orientation of foliation planes of banded amphibolite rocks on the compressional (Vp), shear wave (Vs) velocities propagating and elastic modules using ultrasonic pulse test. The result showed that the planes of foliation have a major effect on the wave velocity, where the Vp and Vs were taken parallel to the foliation plane show higher values than those obtained in the other directions (β = 30, 60 and 90). The preliminary conclusions are developed concerning that the elastic modulus is vary continuously as a function of cleavage orientation with respect to the direction of wave propagations, where Poisson’s ratio having the smallest relative change. The highest values of Young’s modulus and shear modulus are observed for foliation dip angles of 0? and the lowest values are for foliation dip angles of 90. This indicates that the observed intrinsic anisotropy and the close relations of the directional dependent seismic anisotropy to the foliation planes are mainly a result of crystallographic preferred orientation of major minerals (e.g. horn- blende and elongated quarts grains).

  • Anisotropic, Elastic Modulus, Foliation, P- and S-Waves, Ultrasonic Pulse
  • References
  • [1]
    Brown, E.T., Richard, L.R. and Barr, M.V. (1977) Shear Strength Characteristics of Delabole Slate. Proceedings Conference on Rock Engineering, New Castle upon Tyne, 31-51.
    Hoek, E. and Brown, E.T. (1980) Underground Excavation in Rocks, London. The Institution of Mining and Metallurgy.
    Broch, E. (1983) Estimation of Strength Anisotropy Using the Point Load Test. International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, 20, 181-187.
    Rao, K.S., Rao, G.V. and Ramamurthy, T. (1986) A Strength Criterion for Anisotropic Rocks. Indian Geotechnical Journal, 16, 317-333.
    Read, S.A.L., Perrin, N.D. and Brown, I.R. (1987) Measurement and Analysis of Laboratory Strength and Deformability Characteristics of Schistose Rocks. Proceedings of the Sixth International Conference on Rock Mechanics, Montreal, 233-238.
    Ramamurthy, T. (1993) Strength, Modulus Responses of Anisotropic Rocks: In: Hudson, J.A., Ed., Compressive Rock Engineering, Vol. 1, Pergamon, Oxford, 313-329.
    Nasseria, M.H.B., Rao, K.S. and Ramamurthy, T. (2003) Anisotropic Strength and Deformational Behavior of Himalayan Schists. International Journal of Rock Mechanics & Mining Sciences, 40, 3-23.
    Kern, H., Popp, T., Gorbatsevich, F., Zharikov, A., Lobanov, K.V. and Smirnov Yu, P. (2001) Pressure and Temperature Dependence of Vp and Vs in Rocks from the Superdeep Well and from Surfaceanalogues at Kola and the Nature of Velocity Anisotropy. Tectonophysics, 338, 113-134.
    Amadei, B. (1996) Importance of Anisotropy When Estimation and Measuring in Situ Stresses in Rock. International Journal of Rock Mechanics and Mining Sciences & Geo-mechanics Abstracts, 33, 293-326.
    Young, R.P., Hill, T.T., Bryan, I.R. and Middleton, R. (1985) Seismic Spectroscopy in Fracture Characterization. Quartarnary Journal of Engineering Geology, 18, 459-479.
    Kahraman, S. (2002) Estimating the Direct P-Wave Velocity Value of Intact Rock from Indirect Laboratory Measurements. International Journal of Rock Mechanics and Mining Sciences, 39, 101-104.
    Sharma, P.K. and Singh, T.N. (2008) A Correlation between P-Wave Velocity, Impact Strength Index, Slake Durability Index and Uniaxial Compressive Strength. Bulletin of Engineering Geology and the Environment, 67, 17-22.
    Lama, R.D. and Vutukuri, V.S. (1978) Handbook on Mechanical Properties of Rocks. 2nd Edition, Trans Tech Publications, Switzerland.
    Inoue, M. and Ohomi, M. (1981) Relation between Uniaxial Compressive Strength and Elastic Wave Velocity of Soft Rock. Proceedings of the International Symposium on Weak Rock, Tokyo.
    Gaviglio, P. (1989) longitudinal Waves Propagation in a Limestone: The Relationship between Velocity and Density. Rock Mechanics and Rock Engineering, 22, 299-306.
    McCann, D.M. and Fenning, P.J. (1995) Estimation of Rippability and Excavation Conditions from Seismic Velocity Measurements. In: Engineering Geology of Construction, The Geological Society, London, Engineering Geology Special Publication, 10, 335-343.
    Kahraman, S. (2001) A Correlation between P-Wave Velocity, Number of Joints and Schmidt Hammer Rebound Number. International Journal of Rock Mechanics and Mining Sciences, 38, 729-733.
    ASTM (2004) Standard Practices for Preparing Rock Core Specimens and Determining Dimensional and Shape Tolerances, D. 4543-04. Annual Book of A.S.T.M. Standards: American Society for Testing and Materials, West Conshocken.
    ASTM (2005) Standard Test Method for Laboratory Determination of Pulse Velocities and Ultrasonics Elastic Constants of Rock: D. 2845-05, Annual Book of A.S.T.M. Standards: 4.08. American Society for Testing and Materials, West Conshocken.
    Esamaldeen, A., Wu, G., Zhao, Z.M. and Jiang, W.X. (2014) Assessments of Strength Anisotropy and Deformation Behavior of Banded Amphibolite Rocks. Geotechnical and Geological Engineering, 32, 429-438.
    Lo, T.W., Coyner, K.B. and Toksoz, M.N. (1986) Experimental Determination of Elastic Anisotropy of Berea Sandstone, Chicopee Shale, and Chelmsford Granite. Geophysics, 51, 164-171.
    Saroglou, H., Marinos, P. and Tsiambaos, G. (2004) The Aniso-tropic Nature of Selected Metamorphic Rocks from Greece. The Journal of the South African Institute of Mining and Metallurgy, 217-222.
    Sharma, P.V. (1986) Geophysical Methods in Geology. 2nd Edition, Elsevier, Amsterdam.
    Entwisle, D.C. and McCann, D.M. (1990) An Assessment of the Use of Christensen’s Equation for the Prediction of Shear Wave Velocity and Engineering Parameters. In: Geological Applications of Wireline Logs, Geological Society Special Publication No. 48: Geological Society of London, London, 347-354.
    Hassani, P.P., Sadri, A. and Momayez, M. (1997) A Miniature Seismic Reflection System for Evaluation of Concrete Linings. Pure and Applied Geophysics, 10, 677-691.
    Dobrin, B.M. and Savit, C.H. (1988) Introduction to Geophysical Prospecting. 4th Edition, McGraw-Hill.
    Turcotte, D.L. and Schubert, G. (2002) Geodynamics. 2nd Edition, Uni-versity Press, Cambridge.
    Blyth, F.G.H. and De Freitas, M.H. (2003) A Geology for Engi-neers. 7th Edition, Butterworth-Heinemann, Great Britain.

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