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sci.rock-mass-rating Calculator
Calculates Bieniawski's Rock Mass Rating from UCS, RQD, joint spacing, condition, and groundwater, and recommends tunnel support category. RMR > 80 = Very Good (minimal support); RMR 20–40 = Poor (heavy support needed) — RMR is the primary classification for underground excavation design.
Inputs
Ucs Mpa
Reference formula or conversion factor shown for context.
Rqd Pct
Reference formula or conversion factor shown for context.
Joint Spacing Cm
Reference formula or conversion factor shown for context.
Joint Condition
Reference formula or conversion factor shown for context.
Results
RMR (rock mass rating)
A standardised quality or risk rating on the applicable scale.
rock class
The classification assigned based on the computed value.
r1 (strength)
Sample size or count used in the calculation.
r2 (RQD)
Reference formula or conversion factor shown for context.