Geomechanics and Engineering

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Estimation of tensile strength of ultramafic rocks using indirect approaches

  • Diamantis, Konstantinos (Department of Natural Resources Management and Agricultural Engineering, Laboratory of Mineralogy-Geology, Agricultural University of Athens)
  • Received : 2018.11.20
  • Accepted : 2019.01.23
  • Published : 2019.02.28
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Abstract

Because the estimation of the tensile strength is very important in any geotechnical project, many attempts have been made to determine. But the immediate determination of the tensile strength is usually difficult owing to well-shaped specimens, time-consuming, expensive and sometimes unreliable. In this study, engineering properties of several ultramafic rock samples were measured to assess the correlations between the Brazilian Tensile Strength (BTS) and degree of serpentinization, physical, dynamic and mechanical characteristics. For this purpose, a comprehensive laboratory testing program was conducted after collecting thirty-two peridotite and fifty-one serpentinite rock samples, taken from central Greece, in accordance with ASTM and ISRM standards. In addition, a representative number of them were subjected to petrographic studies and the obtained results were statistically described and analysed. Simple and multiple regression analyses were used to investigate the relationships between the Brazilian Tensile Strength and the other measured properties. Thus, empirical equations were developed and they showed that all of the properties are well correlated with Brazilian Tensile Strength. The curves with the $45^{\circ}$ line (y = x) were extracted for evaluating the validity degree of concluded empirical equations which approved approximately close relationships between Brazilian Tensile Strength and the measured properties.

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References

  1. ASTM D2845 (1983), Test Methods for Ultra Violet Velocities Determination, American Society for Testing and Materials.
  2. ASTM D3967 (2001a), Standard Test Method for Splitting Tesile Strength of Intact Rock Core Specimens, American Society for Testing and Materials.
  3. ASTM D4543 (2001b), Standard Practices for Preparing Rock Core Specimens and Determining Dimensional and Shape Tolerances, American Society for Testing and Materials.
  4. ASTM D5731 (2005), Standard Test Method for the Determination of the Point Load Strength Index of Rock, American Society for Testing and Materials.
  5. Bell, F.G. (1978), "The physical and mechanical properties of the Fell sandstone, Nothumberland, England", Eng. Geol., 12, 1-29. https://doi.org/10.1016/0013-7952(78)90002-9
  6. Chen, C.S. and Hsu, S.C. (2001), )"Measurement of indirect tensile strength of anisotropic rocks by the ring test", Rock Mech. Rock Eng., 34(4, 293-321. https://doi.org/10.1007/s006030170003
  7. Christensen, N.I. (1966), "Shear-wave vetocities in metamorphic rocks at pressures to 10 kbar", J. Geophys. Res., 71(14), 3549-3556. https://doi.org/10.1029/JZ071i014p03549
  8. Christensen, N.I. (2004), "Serpentinites, peridotites and seismology", Int. Geol. Rev., 46(9), 795-816. https://doi.org/10.2747/0020-6814.46.9.795
  9. Diamantis, K. (2010), "Engineering geological properties of the ultrabasic rocks in Othrys and Kallidromo mountains (central Greece)", Ph.D. Thesis, Agricultural University of Athens, Athens, Greece.
  10. Escartin, J., Hirth, G. and Evans, B. (2001), "Strength of slightly serpentinized peridotites: Implications for the tectonics of oceanic lithosphere" Geol. Soc. Am., 29(11), 1023-1026.
  11. Fahy, M.P. and Guccione, M.J. (1979), "Estimating strength of sandstone using petrographic thin-section data", Bull. Assoc. Eng. Geol., 16(4), 467-485.
  12. Fereidooni, D. (2016), "Determination of the geotechnical characteristics of Hornfelsic rocks with a particular emphasis on the correlation between physical and mechanical properties", Rock Mech. Rock Eng., 49(7), 2595-2608. https://doi.org/10.1007/s00603-016-0930-3
  13. Fereidooni, D. (2018), "Assessing the effects of mineral content and porosity on ultrasonic wave velocity", Geomech. Eng., 14(4), 399-406. https://doi.org/10.12989/GAE.2018.14.4.399
  14. Fereidooni, D. and Khajevand, R. (2018), "Determining the geotechnical characteristics of some sedimentary rocks from Iran with an emphasis on the correlations between physical, index, and mechanical properties", Geotech. Test. J., 41(3), 555-573.
  15. Foucault, A. and Rault, J.F. (1995), Dictionnaire de Geologie, Masson Sciences, Paris, France.
  16. Gokceoglu, C. and Zorlu, K. (2004), "A fuzzy model to predict the uniaxial compressive strength and the modulus of elasticity of a problematic rock", Eng. Appl. Artif. Intelligence, 17(1), 61-72. https://doi.org/10.1016/j.engappai.2003.11.006
  17. Heidari, M., Khanlari, G.R., Kaveh, M.T. and Kargarian, S. (2011), "Predicting the uniaxial compressive and tensile strengths of gypsum rock by point load testing", Rock Mech. Rock Eng., 45(2), 265-273. https://doi.org/10.1007/s00603-011-0196-8
  18. ISRM (2007), The Blue Book: The Complete ISRM Suggested Methods for Rock Characterization, Testing and Monitoring, 1974-2006, in Compilation arranged by the ISRM Turkish National Group, Kazan Offset Press, Ankara, Turkey.
  19. Katsikatsos, G. Migiros, G. Triantaphyllis, M. and Mettos, A. (1986), "Geological structure of internal Hellenides (E. Thessaly-SW Macedonia. Euboea-Attica-Northern Cyclades islands and Lesvos)", Geol. Geophys. Res., 191-212.
  20. Khajevand, R. and Fereidooni, D. (2018), "Assessing the empirical correlations between engineering properties and P wave velocity of some sedimentary rock samples from Damghan, northern Iran", Arab. J. Geosci., 11(18), 528-540. https://doi.org/10.1007/s12517-018-3810-1
  21. Khanlari, G.R., Heidari, M., Sepahi-Gero, A.A. and Fereidooni, D. (2014), "Quantification of strength anisotropy of metamorphic rocks of the Hamedan Province, Iran, as determined from Cylindrical Punch, Point Load and Brazilian tests", Eng. Geol., 169, 80-90. https://doi.org/10.1016/j.enggeo.2013.11.014
  22. Kilic, A. and Teymen, A. (2008), "Determination of mechanical properties of rocks using simple methods", Bull. Eng. Geol. Environ., 67(2), 237-244. https://doi.org/10.1007/s10064-008-0128-3
  23. Kurtulus, C. Sertcelik, F. and Sertcelik, I. (2015), "Correlating physico-mechanical properties of intact rocks with P-wave velocity", Acta Geod Geophys., 51(3), 571-582. https://doi.org/10.1007/s40328-015-0145-1
  24. Li, X. and Tao, M. (2015), "The influence of initial stress on wave propagation and dynamic elastic coefficients", Geomech. Eng., 8(3), 377-390. https://doi.org/10.12989/gae.2015.8.3.377
  25. Migiros, G., Hatzipanagiotou, K., Gartzos, E., Serelis, K. and Tsikouras, B. (2000), "Petrogenetic evolution of ultramafic rocks from Lesvos Island (NE Aegean, Greece)", Chemie der de, 60, 27-46.
  26. Okubo, K. and Qingxin, Q. (2006), "Uniaxial compression and tension tests of anthracite and loading rate dependence of peak strength", Int. J. Coal Geol., 68(3-4), 96-204.
  27. Ozsoy, E.A., Yilmaz, G. and Arman, H. (2010), "Physical, mechanical and mineralogical properties of ophiolitic rocks at the Yakakayi dam site, Eskisehir, Turkey", Sci. Res. Essays., 5(17), 2579-2587.
  28. Palchik, V. and Hatzor, Y.H. (2004), "The influence of porosity on tensile and compressive strength of porous chalks", Rock Mech. Rock Eng., 37(4), 331-341. https://doi.org/10.1007/s00603-003-0020-1
  29. Shakoor, A. and Bonelli, R.E. (1991), "Relationship between petrographic characteristics, engineering index properties and mechanical properties of selected sandstone", Bull. Assoc. Eng. Geol., 1, 55-71.
  30. Shin, S., Okubo, K. and Hashiba, K. (2005), "Variation in strength and creep life of six Japanese rocks", Int. J. Rock Mech. Min. Sci., 42(2), 251-260. https://doi.org/10.1016/j.ijrmms.2004.08.009
  31. Singh, V.K., Singh, D. and Singh, T.N. (2001), "Prediction of strength properties of some schistose rocks from petrographic properties using artificial neural networks", Int. J. Rock Mech. Min. Sci., 38(2), 269-284. https://doi.org/10.1016/S1365-1609(00)00078-2
  32. Solanki, P., Ebrahimi, A. and Zaman, M.M. (2008), "Statistical models for determination of the resilient modulus of subgrade soils", Int. J. Pav. Res. Technol., 1(3), 85-93.
  33. Solanki, P., Zaman, M.M. and Ebrahimi, A. (2009), Regression and Neural Network Modeling of Resilient Modulus of Subgrade Soils for Pavement Design Applications, in Intelligent and Soft Computing in Infrastructure Systems Engineering, Springer, Berlin, Heidelberg, Germany, 269-304.
  34. Vasconcelos, G., Lourenco, P.B., Alves, C.A.S. and Pamplona, J. (2008), "Ultrasonic evaluation of the physical and mechanical properties of granites", Ultrasonics, 48(5), 453-466. https://doi.org/10.1016/j.ultras.2008.03.008
  35. Wang, X.M., Jia, S.Q., Kou, Z.X. and Lindqvist, P.A. (2004), "The flattened Brazilian disc specimen used for testing elastic modulus, tensile strength and fracture toughness of brittle rocks: Analytical and numerical results", Int. J. Rock Mech. Min. Sci., 41(2), 245-253. https://doi.org/10.1016/S1365-1609(03)00093-5
  36. Young, R.P., Hill, T.T., Bryan, I.R. and Middleton, R. (1985), "Seismic spectroscopy in fracture characterization", Quart. J. Eng. Geol., 18(4), 459-479. https://doi.org/10.1144/GSL.QJEG.1985.018.04.16