Rock mass rating

  1. Pages with script errors
  2. Geotechnical engineering
  3. Rock mass classification


The rock mass rating (RMR) system is a geomechanical classification system for rocks, developed by Z. T. Bieniawski between 1972 and 1973.[1]

Definition

The following six parameters are used to classify a rock mass using the RMR system

  1. Uniaxial compressive strength of rock material
  2. Rock quality designation (RQD)
  3. Spacing of discontinuities
  4. Condition of discontinuities
  5. Groundwater conditions
  6. Orientation of discontinuities

Each of the six parameters is assigned a value corresponding to the characteristics of the rock. These values are derived from field surveys. The sum of the six parameters is the "RMR value", which lies between 0 and 100.

Classification table

Below is the classification table for the RMR system.

RMR Rock quality
0 - 20 Very poor
21 - 40 Poor
41 - 60 Fair
61 - 80 Good
81 - 100 Very good

Applications

Rock Mass Rating has found wide application in various types of engineering projects such as tunnels, slopes, foundations, and mines. It is also adaptable for knowledge-based expert systems. A joke among engineers is that rock structure can be commonly broken into two general classifications; 'CHILE' — Continuous Homogenous Isotropic Linear Elastic (what most geotechinical engineers would like to see) and 'DIANE' — Discontinuous Inhomogenous Anisotropic Non-Elastic (what most in-situ rock masses actually are). A RMR system provides a method of incorporating some of the complex mechanics of DIANE rocks into engineering design.

See also

References

  1. ↑ Script error

Further reading

  • Hack, H.R.G.K. (25-28 November 2002). "An evaluation of slope stability classification. Keynote Lecture.". In Dinis da Gama, C.; Ribeira e Sousa, L.. Proc. ISRM EUROCK’2002. Funchal, Madeira, Portugal: Sociedade Portuguesa de Geotecnia, Lisboa, Portugal. pp. 3–32. ISBN 972-98781-2-9.
  • Pantelidis L. (2009) "Rock slope stability assessment through rock mass classification systems" International Journal of Rock Mechanics and Mining Sciences, 46(2):315–325.de:RMR-Wert

es:Clasificación geomecánica de Bienawiski o RMR ko:RMR it:Rock mass rating tr:Kaya kütle indeksi


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