Correlations between direct and indirect strength test methods

Raj Kallu, Pedram Roghanchi

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


The difficulties associated with performing direct compression strength tests on rocks lead to the development of indirect test methods for the rock strength assessment. Indirect test methods are simple, more economical, less time-consuming, and easily adaptable to the field. The main aim of this study was to derive correlations between direct and indirect test methods for basalt and rhyolite rock types from Carlin trend deposits in Nevada. In the destructive methods, point load index, block punch index, and splitting tensile strength tests are performed. In the non-destructive methods, Schmidt hammer and ultrasonic pulse velocity tests are performed. Correlations between the direct and indirect compression strength tests are developed using linear and nonlinear regression analysis methods. The results show that the splitting tensile strength has the best correlation with the uniaxial compression strength. Furthermore, the Poisson's ratio has no correlation with any of the direct and indirect test results.

Original languageEnglish
Pages (from-to)355-360
Number of pages6
JournalInternational Journal of Mining Science and Technology
Issue number3
StatePublished - May 1 2015

Bibliographical note

Publisher Copyright:
© 2015 Published by Elsevier B.V. on behalf of China University of Mining and Technology.


  • Correlation
  • Indirect strength test methods
  • Regression analysis
  • Uniaxial compression strength test

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Geotechnical Engineering and Engineering Geology
  • Geochemistry and Petrology


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