Featured Tunnel Ventilation Projects
SR99 Tunnel Project
Designed to enhance safety and emergency vehicle access, the SR99 Tunnel features a two-level roadway tunnel to replace the earthquake damaged Alaskan Way Viaduct. At 57.5 feet in diameter and nearly 2 miles long, the tunnel in downtown Seattle is the world’s second-largest soft ground, machine-bored tunnel featuring state-of- the-art ventilation, fire detection and suppression systems designed by the HNTB Ventilation and Fire Life Safety Team. Analysis, represented by the image at left, determined ventilation operations to effectively mitigate carbon emissions during normal and congested tunnel operations.
Boston South Station Expansion
The $37 million South Station Expansion (SSX) project is part of the vision for the New England High-Speed and Intercity Rail Network. Under the direction of MassDOT’s Office of Transportation Planning, and in cooperation with the Federal Railroad Administration, HNTB completed all Preliminary engineering for the expansion of Boston’s South Station and development of rail vehicle layover facilities; including fire life safety analysis for proposed and existing facilities. Analyses performed by the HNTB Tunnel Ventilation and Fire Life Safety Team also helped guide diesel locomotive operating protocols to optimize occupant safety and comfort and meet regulatory requirements.
Tunnel Ventilation Experts
Tunnel Ventilation News and Insights
Invisible Enemy: Rail Dust
Implementing Ventilation and Raising Transit Pandemic Resiliency
Our tunnel ventilation experts discuss how appropriate safety measures, procedures and protocols can promote safe public transit and increase the resiliency of systems during a pandemic, as well as readiness to face possible similar events in the future. Read more.
Deep Thinking – Underground Solutions
Best Practices for Long Transit and Rail Tunnels