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Bieniawski Rock Mass Rating (RMR) Geomechanical Rock Classification Calculator

Easily calculate and compute bieniawski rock mass rating (rmr) geomechanical rock classification calculator with accurate equations, live formulas, and expert guidance.

Based on UCS or Point Load Index (e.g., UCS > 100 MPa gives 12).

Based on borehole core RQD (e.g., RQD 75-90% gives 17).

Spacing of joints/bedding planes (e.g., 0.6-2 m gives 15).

Roughness, persistence, infilling, and weathering.

Dry = 15, Damp = 10, Wet = 7, Dripping = 4, Flowing = 0.

Adverse orientation penalty for tunnels or slopes.

What Is the Bieniawski Rock Mass Rating (RMR) Geomechanical Rock Classification Calculator?

This tool computes bieniawski rock mass rating (rmr) geomechanical rock classification calculator with high precision arithmetic.

How Does the Bieniawski Rock Mass Rating (RMR) Geomechanical Rock Classification Calculator Work?

Classifies rock mass geomechanical quality using Bieniawskis Rock Mass Rating (RMR89) system, predicting unsupported tunnel stand-up times, cohesion, and friction angle.

Bieniawski Rock Mass Rating (RMR) Geomechanical Rock Classification Calculator Formula & Variables

The core mathematical equation utilized by this calculator is expressed as:

RMR=∑i=16Ri\text{RMR} = \sum_{i=1}^6 R_i

Classifies rock mass geomechanical quality using Bieniawskis Rock Mass Rating (RMR89) system, predicting unsupported tunnel stand-up times, cohesion, and friction angle.

How to Use the Bieniawski Rock Mass Rating (RMR) Geomechanical Rock Classification Calculator

  1. Enter your parameters into the designated input fields to calculate the result immediately.

Step-by-Step Example Calculation

Bieniawski Rock Mass Rating (RMR) Geomechanical Rock Classification Calculator Example

Input Values:

uniaxialCompressiveStrengthRatingR1:12.0
rockQualityDesignationRatingR2:17.0
discontinuitySpacingRatingR3:15.0
discontinuityConditionRatingR4:22.0
groundwaterConditionRatingR5:10.0
jointOrientationAdjustmentR6:-5.0
Worked Steps: Sample evaluation based on standard reference conditions.

Understanding Your Result

The calculated primary figure indicates the optimal or required RMR Score.

Factors That Affect the Result

  • Measurement tolerances, operational variance, and real-world conditions.

When Should You Use This Calculator?

  • Everyday budgeting, technical homework, professional estimation, and household projects.

Assumptions & Limitations

  • Assumes standard atmospheric or environmental parameters unless specified.

Frequently Asked Questions

Calculation Accuracy & Reference Note

Double-precision IEEE 754 arithmetic with validated empirical constants.

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