page_title: Rock mass rating
section_title: Procedures
hierarchical_section_title: Rock mass rating / Procedures
caption_attribution_description: English: User Interface of QuickRMR-89
context_page_description: The rock mass rating is a geomechanical classification system for rocks, developed by Z. T. Bieniawski between 1972 and 1973.
  Since then it has undergone multiple modifications out of which, RMR89 is commonly used. Recently RMR14 has been proposed to improve the RMR performance by incorporating new experiences from tunnel practices. Continuous functions and a software "QuickRMR" for RMR89 and RMR14 have also been proposed by Kundu. RMR combines the most significant geologic parameters of influence and represents them with one overall comprehensive index of rock mass quality, which is used for the design and construction of excavations in rock, such as tunnels, mines, slopes, and foundations.
context_section_description: The details for calculating RMR are given by Edumine and provide a series of tables for RMR determination while the latest charts for the same purpose are given in the references and further reading. In particular, the charts enclosed here for the RMR parameters intact rock strength and the combined parameters RQD and discontinuity spacing (represented by the number of discontinuities per meter), show the advantage of using the charts for better accuracy, rather than relying on the tables which show the average ratings for the ranges of each RMR parameter. The lump ratings for each parameter makes it difficult for less experienced personnel to determine the RMR accurately. There are also subjective parameters like roughness and weathering which may pose difficulty in rating assignment. Kundu et al.  have proposed continuous functions for each parameter of RMR89 and RMR14 including roughness and weathering. They have also developed a software "QuickRMR" based on the continuous functions to calculate RMR with quantitative inputs.
caption: User Interface of QuickRMR-89
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