Mining rock mass rating

Within geotechnical engineering, Laubscher developed the Mining Rock Mass Rating (MRMR) system by modifying the Rock Mass Rating (RMR) system of Z. T. Bieniawski. In the MRMR system the stability and support are determined with the following equations:RMR = IRS + RQD + spacing + conditionin which: RMR = Laubschers Rock Mass Rating IRS = Intact Rock Strength RQD = Rock Quality Designation spacing = expression for the spacing of discontinuities condition = condition of discontinuities MRMR = RMR * adjustment factors in which: adjustment factors = factors to compensate for: the method of excavation, orientation of discontinuities and excavation, induced stresses, and future weathering

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