Welcome to the Ventilation Type Selection in Tunnels - Decision support tool.
This application assists engineers in evaluating tunnel ventilation system requirements by comparing multiple international standards, enabling faster and more consistent decision-making during early design stages.
Capabilities & Workflow
- Multi-Standard Evaluation: Compare tunnel geometry, fire loads, and traffic composition against ASTRA (Swiss), RVS (Austrian), RABT (German), French, and AASHTO/NFPA guidelines.
- NFPA 502 Automatic Categorization: The system automatically determines tunnel category (A, B, C, or D) based on length criteria.
- Integrated Engineering Tools: Includes calculators for critical velocity and Austrian risk assessment.
- Decision & Reporting Output: Generates concise text summaries indicating alignment with standards and key recommendations.
How to Use
- Input Project Data: Enter tunnel dimensions, traffic class, and other required parameters into the input section.
- Select Standards: Enable the guideline checkboxes to activate comparative assessment.
- Review Analysis: The tool highlights applicable matrix values and displays results in the OUTPUT panel.
- View Detailed Matrices: Access guideline tables through options like “View ASTRA Matrix”.
- Explore Additional Tools: Use the “MORE” menu for risk calculation modules and additional engineering assessment features.
Acronyms & Abbreviations
TVS: Tunnel Ventilation System
AADT: Annual Average Daily Traffic
HGV: Heavy Goods Vehicle
FLC: Flammable Cargo
HRR: Heat Release Rate
AMF: Accident Modification Factor
FMF: Fire Modification Factor
ALARP: As Low As Reasonably Practicable
Uni: Unidirectional Traffic
Bi: Bidirectional Traffic
Supp: Fire Suppression System
Vent: Ventilation
Cong: Congestion
DTV: Average Daily Traffic
Nat: Natural Ventilation
Mech: Mechanical Ventilation
Trans: Transverse Ventilation
French Classification Notes
- (1): Massive Extraction required
- (1'): Compensatory Measures required
- (2): Desirable Airflow Control
- (2'): Mandatory Airflow Control
- (3): Forbidden Except with Compensatory Measures
- (4): Only if transverse system is ineffective
Credits & Contact
Developed by:
SMH Adil — adil@geedsim.com
Mohd Ahsan Khan — ahsan@geedsim.com
For support, clarifications, or feature requests, please contact the developers.
Legal Disclaimer
This tool utilizes information from international standards and is intended exclusively for preliminary assessment purposes; it does not constitute certified engineering advice. All outputs must be independently verified and approved by qualified tunnel ventilation specialists before any application or reliance. The authors assume no responsibility or liability for loss, damage, or consequences arising from use or interpretation of this tool. The tool and its results are inadmissible as evidence in any legal, regulatory, or contractual dispute.
