Rock Mass Rating system

Rock Mass Rating system

The Rock Mass Rating (RMR) system is a geomechanical classification system for rocks, developed by T.Z. Bieniawski between 1972 and 1973.

Definition

The following six parameters are used to classify a rock mass using the RMR system
#Uniaxial compressive strength of rock material
#Rock quality designation (RQD)
#Spacing of discontinuities
#Condition of discontinuities
#Groundwater conditions
#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. [cite web | url=http://www.ocrwm.doe.gov/documents/spg42gm3_a/tables/tab_11.htm | title=Table: 11 | work=U.S. Department of Energy | accessdate=2006-11-27]

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.

Literature

* Bieniawski, Z.T. "Engineering Rock Mass Classifications", John Wiley and Sons, New York, 1989
*— "The Rock Mass Rating (RMR) System (Geomechanics Classification) in Engineering Practices." Rock Classification Systems for Engineering Purposes, 17-34. Philadelphia, Pennsylvania: American Society for Testing and Materials, 1988

References

http://www.rocscience.com/hoek/pdf/3_Rock_mass_classification.pdf


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