Critical appraisal of correlations between CBR and subgrade modulus

Ever since its inception in 1929, the California bearing ratio (CBR) test has been the most preferred strength test when it comes to evaluating subgrade strength for pavement design. It still remains popular due to the ease and the low cost with which it can be carried out. But the highly empirical nature of the test often makes the results unreliable, and the countless correlations such as the ones between CBR and subgrade modulus hard to fathom. Since CBR is purely a penetration-based test, it becomes hard to attribute the various elastic and plastic phenomena associated with soil. A better understanding needs to be developed about the deformation behaviour of soil. A precursor to that would be to study the relationships that have been established (E-CBR) and also the influence of other soil parameters (cohesion, friction angle, etc.). This paper aims at reviewing these correlations and also to study the influence of cohesion and friction angle on these equations through numerical simulations using the finite element method (FEM).

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  • Supplemental Notes:
    • Abstract reprinted with permission from the publisher.
  • Authors:
    • Kumar, Pawan
    • Dilip, Deepthi Mary
    • Babu, G L Sivakumar
  • Publication Date: 2014


  • English

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 15-24
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 01528550
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 20 2014 9:20AM