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Rock Mass Rating (RMR89) & Stand-Up Time Calculator

Easily calculate and compute rock mass rating (rmr89) & stand-up time calculator with accurate equations, live formulas, and expert guidance.

Calculated Result
69 score

RMR Basic Geomechanics Score (0-100)

RMR Basic Geomechanics Score (0-100)

69 score

Geomechanical Rock Class

Class II: Good Rock (RMR 61-80)

Unsupported Stand Up Time

1 year for 10m span

Cohesion Kpa

350

Internal Friction Angle Deg

40

69 — score

Calculation Breakdown

  1. Applied FormulaComputes Bieniawski RMR89 rock mass rating score, rock mass class (I to V), unsupported roof stand-up time, and equivalent Mohr-Coulomb cohesion and friction angle.\text{RMR} = R_{\text{UCS}} + R_{\text{RQD}} + R_{\text{spacing}} + R_{\text{cond}} + R_{\text{water}} - R_{\text{orient}}

Bieniawski RMR & Stand-Up Time Metric Output

Interactive visualization based on your current inputs

Calculated Value
0.017355269RMR Basic Geomechanics Score (0-100)

What Is the Rock Mass Rating (RMR89) & Stand-Up Time Calculator?

This tool computes rock mass rating (rmr89) & stand-up time calculator with high precision arithmetic.

How Does the Rock Mass Rating (RMR89) & Stand-Up Time Calculator Work?

Computes Bieniawski RMR89 rock mass rating score, rock mass class (I to V), unsupported roof stand-up time, and equivalent Mohr-Coulomb cohesion and friction angle.

Rock Mass Rating (RMR89) & Stand-Up Time Calculator Formula & Variables

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

RMR=RUCS+RRQD+Rspacing+Rcond+Rwater−Rorient\text{RMR} = R_{\text{UCS}} + R_{\text{RQD}} + R_{\text{spacing}} + R_{\text{cond}} + R_{\text{water}} - R_{\text{orient}}

Computes Bieniawski RMR89 rock mass rating score, rock mass class (I to V), unsupported roof stand-up time, and equivalent Mohr-Coulomb cohesion and friction angle.

How to Use the Rock Mass Rating (RMR89) & Stand-Up Time Calculator

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

Step-by-Step Example Calculation

Rock Mass Rating (RMR89) & Stand-Up Time Calculator Example

Input Values:

intactRockUcsRating:12
rqdRating:17
discontinuitySpacingRating:15
discontinuityConditionRating:20
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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