Estimating shear wave velocity of soil using standard penetration test (SPT) blow counts in Mashhad city

  • Omolbanin AtaeeEmail author
  • Naser Hafezi Moghaddas
  • Gholam Reza Lashkaripour


This study investigates the correlation between shear wave velocity (\(V_{\mathrm{S}}\)) and standard penetration test blow counts (SPT-N value) in all soil types, gravelly soil, sandy soil and clayey soil for Mashhad city in the north eastern region of Iran. The \(V_{\mathrm{S}}\) data used were measured through downhole method in 84 construction projects (in 88 boreholes). From among collected data, 424 pairs of \(V_{\mathrm{S}}\)-SPT recorded in one depth were used for regression analysis. The obtained results showed that the N-value had a critical role in estimating \(V_{\mathrm{S}}\) and soil type was less effective in this regard. These findings are in line with the findings of the previous studies. Regression equations obtained in this study were compared with correlations from previous studies. There was a relative similarity between the previously published and the new regression equations for Iranian soils. Although almost all correlations follow a similar trend, there are significant differences between new equations and correlations reported for other countries. The regression coefficients of the new equations show the acceptable capability of the suggested correlations in estimating \(V_{\mathrm{S}}\) through SPT-N value. Therefore, these equations can be used to estimate \(V_{\mathrm{S}}\) for the soils of the current study area and for other similar areas. Moreover, \(V_{\mathrm{S30}}\) was used for site classification of the study area as per National Earthquake Hazard Reduction Program (NEHRP) guidelines and it was shown that a major portion of the city comes under site class C and other locations are categorised as site class D.



The authors appreciate cooperation from consulting engineering companies and soil mechanics laboratories in Mashhad city for providing their geotechnical reporting for use in this paper. They also acknowledge the kind cooperation from the Zamin Physic Pouya consulting engineering company for giving permission to use measured shear wave velocity.


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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  • Omolbanin Ataee
    • 1
    Email author
  • Naser Hafezi Moghaddas
    • 2
  • Gholam Reza Lashkaripour
    • 2
  1. 1.University of MazandaranBabolsarIran
  2. 2.Faculty of GeologyFerdowsi University of MashhadMashhadIran

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