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Development of Practical Correlations Between Cone Penetration Resistance and SPT Values for Various Types of Soils

  • Mahdi Khodaparast
  • Ali M. RajabiEmail author
  • Mohammad Derakhshan
Research Paper
  • 13 Downloads

Abstract

A suite of relationships has been developed between cone penetration resistance (qc) and SPT values of clayey and sandy soils. The major difference between these relationships and those of previous studies lies in the range of data and variety of soils. Most studies with the same scope of research since 1959 have been considered herein, and their practical data have been collected. Then, by means of statistical analyses and data refinement, a database was provided for diverse types of soils (including silty sand, clayey, sandy and sandy silt soils). Accordingly, for each soil type, the data were classified as either regression or test data. The regression data were applied to develop the correlations between qc and SPT value (N60). The test data were employed to examine accuracy of the correlation compared to the available relationships for the same soil type. The results indicate that the proposed relationships between qc and N60 for silty sand, sandy and sandy silt soils are simple with RMSE values equal to 0.078, 7.012 and 7.498, respectively, whereas in the case of clay, the relationship becomes more complex (accuracy of 0.248). Based on the results derived herein, it can be concluded that all relationships proposed in this study are of greater accuracy compared to the previous relations.

Keywords

Cone penetration test (CPT) Standard penetration test (SPT) Correlation Cone penetration resistance 

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Copyright information

© Shiraz University 2019

Authors and Affiliations

  1. 1.Department of Civil EngineeringUniversity of QomQomIran
  2. 2.Department of Engineering GeologyUniversity of TehranTehranIran

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