What is the rock mass rating system?

The rock mass rating system is a geomechanical classification method developed by Z. T. Bieniawski to evaluate rock quality. It combines key geological parameters into an overall index used for designing and constructing tunnels, mines, slopes, and foundations. Over time, the system has undergone multiple modifications, such as RMR89, RMR14, and adaptations for mining and slopes.

What we know

• The rock mass rating system was developed by Z. T. Bieniawski between 1972 and 1973. [2]
• RMR combines significant geologic parameters of influence into a single comprehensive index of rock mass quality for engineering excavations. [2]
• The system has undergone multiple modifications, leading to widely used versions like RMR89 and the more recent RMR14. [2]
• DH Laubscher developed the Mining Rock Mass Rating system by modifying Bieniawski's original RMR system. [4]

Where to go next

• whoWho developed the mining rock mass rating?
• compared withHow does slope mass rating modify RMR?
• the bigger pictureWhat are rock mass classification systems?
• how it workedHow is software used to calculate RMR?
• whereWhere is slope mass rating used in regulations?
• an unexpected connectionHow do slope stability indices span across five continents?An engineering method born from underground rock rating systems directly evolved into a global standard used in technical regulations across more than 50 countries.

Sources

• [1]Rock mass rating (Wikidata Q1133006) · CC0 1.0
• [2]Rock mass rating · CC BY-SA 4.0
• [3]Rock mass classification · CC BY-SA 4.0
• [4]Mining rock mass rating · CC BY-SA 4.0
• [5]Slope mass rating · CC BY-SA 4.0