Use our free online Rock Mass Rating (RMR) Calculator to quickly assess rock mass quality and predict engineering properties. This essential tool simplifies calculations for geotechnical engineers, aiding in critical decisions for tunnel design, slope stability, and foundation analysis.
Formula:
The Rock Mass Rating (RMR) system, developed by Bieniawski, is determined by summing the ratings of five key parameters:
RMRbasic = R1 + R2 + R3 + R4 + R5
Where:
- R1: Rating for Uniaxial Compressive Strength (UCS) of intact rock material
- R2: Rating for Rock Quality Designation (RQD)
- R3: Rating for Spacing of Discontinuities
- R4: Rating for Condition of Discontinuities
- R5: Rating for Groundwater Conditions