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Reference.org
Rock mass rating
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<p>The rock mass rating (RMR) is a <a href="/facts/Geomechanics/jNybz7oH">geomechanical</a> classification system for <a href="/facts/Rock_(geology)/FXCJkmop">rocks</a>, 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. </p>