A new expression of three adjustment factors of Slope Mass Rating classification

Pedram Roghanchi, Raj Kallu, Rahul Thareja

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Slope Mass Rating (SMR) is a useful tool for slope stability assessment, and has been widely used in rock slope engineering. The SMR is obtained by adding four correction factors to the value of basic RMR (Rock Mass Rating). Three of these correction factors depend on the geometrical relationship between the slope face and its inherent joints. Discrete nature of these parameters makes them rigid to be applied significantly. Small change in the value of each of these parameters can cause significant change in the value of overall index. In this paper new curves are proposed to determine the ratings of these three adjustment factors of SMR based on the fuzzy membership function of each adjustment factor. The results from this study are compared to the existing relations for calculation of SMR adjustment factors. The comparison study showed that the proposed curves are valid and are easy to use for estimating the adjustment factors' rating. Further, the comparison study showed reasonably better estimation of the F3 adjustment factor rating.

Original languageEnglish
Pages (from-to)404-410
Number of pages7
JournalInternational Journal of Earth Sciences and Engineering
Issue number3
StatePublished - Jun 2013


  • Classification systems
  • Continuous function
  • Rating curves
  • SMR
  • Slope stability

ASJC Scopus subject areas

  • Environmental Engineering
  • Civil and Structural Engineering
  • Building and Construction
  • Ocean Engineering
  • General Earth and Planetary Sciences


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