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sci.rock-mass-rating-Bieniawski-RMR Calculator
Calculates Bieniawski Rock Mass Rating (RMR89) from UCS, RQD, discontinuity spacing, condition, and groundwater rating, and recommends tunnel support class. RMR 81–100 = Class I (Very Good, self-supporting); RMR 21–40 = Class IV (Poor, steel ribs + shotcrete required).
Inputs
Ucs Mpa
Reference formula or conversion factor shown for context.
Rqd Pct
Reference formula or conversion factor shown for context.
Spacing M
Reference formula or conversion factor shown for context.
Joint Condition
Reference formula or conversion factor shown for context.
Groundwater
Reference formula or conversion factor shown for context.
Results
Rock Mass Rating RMR89
A standardised quality or risk rating on the applicable scale.
UCS rating
A standardised quality or risk rating on the applicable scale.
RQD rating
A standardised quality or risk rating on the applicable scale.
Joint spacing rating
A standardised quality or risk rating on the applicable scale.