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Rock Tunneling Quality Index (Q-System - Barton) Calculator

Easily calculate and compute rock tunneling quality index (q-system - barton) calculator with accurate equations, live formulas, and expert guidance.

Percentage of intact drill core pieces > 10 cm.

Number of joint sets (e.g. 9 for three joint sets).

Roughness of critical joint plane (e.g. 2 for rough or irregular).

Degree of mineral alteration/clay filling.

Water pressure and inflow factor.

Overburden squeezing or rockburst stress factor.

Calculated Result
4.4 index

Barton Q Rock Mass Quality Index

Barton Q Rock Mass Quality Index

4.4 index

Q Index

4.4

Rock Quality Description

Fair Rock (Q 4 to 10)

Block Relative Size

8.333333333333334

Interblock Shear Strength

2

4.4 — index

Calculation Breakdown

  1. Applied FormulaCalculates the Norwegian Geotechnical Institute (NGI / Barton) Q-index from rock structure, joint friction, and stress reduction factor to specify tunnel reinforcement.Q = \left( \frac{RQD}{J_n} \right) \left( \frac{J_r}{J_a} \right) \left( \frac{J_w}{SRF} \right)

Barton Q-System Tunneling Metric Output

Interactive visualization based on your current inputs

Calculated Value
0.01.12.23.34.4Barton Q Rock Mass Quality Index

What Is the Rock Tunneling Quality Index (Q-System - Barton) Calculator?

This tool computes rock tunneling quality index (q-system - barton) calculator with high precision arithmetic.

How Does the Rock Tunneling Quality Index (Q-System - Barton) Calculator Work?

Calculates the Norwegian Geotechnical Institute (NGI / Barton) Q-index from rock structure, joint friction, and stress reduction factor to specify tunnel reinforcement.

Rock Tunneling Quality Index (Q-System - Barton) Calculator Formula & Variables

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

Q=(RQDJn)(JrJa)(JwSRF)Q = \left( \frac{RQD}{J_n} \right) \left( \frac{J_r}{J_a} \right) \left( \frac{J_w}{SRF} \right)

Calculates the Norwegian Geotechnical Institute (NGI / Barton) Q-index from rock structure, joint friction, and stress reduction factor to specify tunnel reinforcement.

How to Use the Rock Tunneling Quality Index (Q-System - Barton) Calculator

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

Step-by-Step Example Calculation

Rock Tunneling Quality Index (Q-System - Barton) Calculator Example

Input Values:

rqdScore:75
jointSetNumberJn:9
jointRoughnessJr:2
jointAlterationJa:1
jointWaterReductionJw:0.66
stressReductionFactorSrf:2.5
Worked Steps: Sample evaluation based on standard reference conditions.

Understanding Your Result

The calculated primary figure indicates the optimal or required index.

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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