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COMBINING THE RMR, Q, AND RMI CLASSIFICATION SYSTEMS (2009)

The main rockmass classification systems make use of similar rockmass parameters. It is therefore shown how the input parameters of the RMR, Q and RMi systems can be combined into one set of tables. These enable the ground  quality to be found directly and independently in the three systems from only one set of observations. Thus, the estimated rock support found in one system can be easily checked in other systems. This method results in better rock support estimates; provided the actual ground is within the limitations of the systems and that the ground characterization is properly made.  The combined input and calculations can easily be made in a computer  spreadsheet. The paper also shows that there are crude correlations between the three systems, i.e. that the estimated quality of 
the same ground is calculated differently in the three systems. This supports the postulate of Bieniawski that at  least two classification systems should be applied in rock engineering assessments. 
Reference:
Palmstrom, A., 2009: Combining the RMR, Q, and RMi classification systems. www.rockmass.net, 25p
Organization:
Norwegian Geotechnical Institute
Norway
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