Q-System Rock Quality Index

Calculate rock mass quality index Q using Barton's Q-system with RQD, joint set number Jn, joint roughness Jr, alteration Ja, water Jw, and stress reduction SRF for underground excavation support design.

2D stress state at a point. All stresses in MPa.

σx — Normal Stress X (MPa)
σy — Normal Stress Y (MPa)
τxy — Shear Stress (MPa)
⚙ Mechanical Note: Results are based on standard textbook formulas and ISO/AASHTO references. Always verify critical designs with applicable codes (ISO 898, AASHTO 1993, AISC, Eurocode 3) and a qualified engineer.
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How It Works

Calculate rock mass quality index Q using Barton's Q-system with RQD, joint set number Jn, joint roughness Jr, alteration Ja, water Jw, and stress reduction SRF for underground excavation support design

Each component has a specific meaning:

  • Barton's Q-system — The barton's q-system recorded for the patient or scenario being assessed.

Note: Interpret the q-system rock quality result against the clinical thresholds and context described above.

How to Use

Enter the Barton's Q-system for the patient or scenario you are assessing. Calculate rock mass quality index Q using Barton's Q-system with RQD, joint set number Jn, joint roughness Jr, alteration Ja, water Jw, and stress reduction SRF for underground excavation support design. Use the q-system rock quality result to inform your clinical assessment.

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Frequently Asked Questions