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eng.mine-ground-support-RQD Calculator
Calculates Rock Quality Designation (RQD) from core recovery data and classifies rock mass quality from excellent to very poor. RQD correlates with Barton's Q-system and Bieniawski's RMR — these empirical classification systems link to tunnel support requirements.
Inputs
L Total M
Reference formula or conversion factor shown for context.
L Pieces M
Reference formula or conversion factor shown for context.
Rmr Basic
Total mass (kg). Distinct from weight — weight = mass × gravity. Mass is constant; weight varies with location.
Results
RQD (%)
Reference formula or conversion factor shown for context.
Q system estimate
The value at the specified point or condition.
support recommendation
Suggested action or value based on the computed results and applicable best-practice guidelines.
RQD = ΣL_pieces(>10cm) / L_total × 100
The combined total across all inputs and components.
RQD classification
Category assigned based on where the computed value falls on a defined scale. Check which standard or guideline defines these boundaries.