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Bieniawski Rock Mass Rating (RMR₈₉) Geomechanical Classification Calculator

Easily calculate and compute bieniawski rock mass rating (rmr₈₉) geomechanical classification calculator with accurate equations, live formulas, and expert guidance.

UCS > 250 MPa = 15; 100-250 MPa = 12; 50-100 MPa = 7.

RQD 90-100% = 20; 75-90% = 17; 50-75% = 13.

Spacing > 2 m = 20; 0.6-2 m = 15; 0.2-0.6 m = 10.

Rough surfaces, unweathered = 25-30; gouge filled = 0-10.

Completely dry = 15; damp = 10; dripping = 4; flowing = 0.

Favorable = 0 to -2; Fair = -5; Very unfavorable = -12.

What Is the Bieniawski Rock Mass Rating (RMR₈₉) Geomechanical Classification Calculator?

This tool computes bieniawski rock mass rating (rmr₈₉) geomechanical classification calculator with high precision arithmetic.

How Does the Bieniawski Rock Mass Rating (RMR₈₉) Geomechanical Classification Calculator Work?

Computes Bieniawski’s Rock Mass Rating (RMR₈₉) classifying rock into five geomechanical classes (I to V) to estimate tunnel stand-up time, cohesion, and friction angle.

Bieniawski Rock Mass Rating (RMR₈₉) Geomechanical Classification Calculator Formula & Variables

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

RMR=RUCS+RRQD+Rspacing+Rcond+Rwater+Radjust\text{RMR} = R_{\text{UCS}} + R_{\text{RQD}} + R_{\text{spacing}} + R_{\text{cond}} + R_{\text{water}} + R_{\text{adjust}}

Computes Bieniawski’s Rock Mass Rating (RMR₈₉) classifying rock into five geomechanical classes (I to V) to estimate tunnel stand-up time, cohesion, and friction angle.

How to Use the Bieniawski Rock Mass Rating (RMR₈₉) Geomechanical 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 (RMR₈₉) Geomechanical Classification Calculator Example

Input Values:

ucsRating:12
rqdRating:17
jointSpacingRating:15
jointConditionRating:22
groundwaterRating:10
jointOrientationAdjustment:-5
Worked Steps: Sample evaluation based on standard reference conditions.

Understanding Your Result

The calculated primary figure indicates the optimal or required 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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