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TRUSTED INNOVATIVE UNDERGROUND SOLUTIONS

The HNTB Companies Infrastructure Solutions

INNOVATIVE TUNNEL SOLUTIONS HNTB experts have the insight and knowledge to provide innovative solutions on a wide range of tunnels, including cut-and-cover, tunnel boring machine (TBM) tunnels, conventional tunneling, NATM, immersed tube tunnels, shaft construction and micro-tunneling. Our long history in planning, program management, design, construction management and technical services for tunnel structures includes award-winning projects on some of the country’s most complex infrastructure projects.

Recipient of numerous national and international awards including the International Tunneling Award, Advisor/ Program Manager of the year and the UCA of SME Project of the Year Award.

Tom Lantos Tunnels at Devil’s Slide San Mateo County, California

Istanbul Strait Road Tunnel Project

Crenshaw/LAX Transit Corridor Los Angeles, California

Istanbul, Turkey

HNTB is the principal engineer and architect for Walsh/Shea Corridor Constructors on an 8.5-mile, eightstation, light rail design-build project that will connect the Los Angeles County Metropolitan Transportation Authority’s existing Green Line with the Expo Line and integrate Los Angeles International Airport into the regional rail network.

The project was challenged by the area’s varied geology and propensity for earthquakes, high water pressure below sea level and the tunnel’s large-diameter/ double-deck lane configuration. It was recognized as the ITA Project of the Year.

Sound Transit University Link (U-LINK) Extension Seattle, Washington

HNTB’s role included design of more than 3 miles of twin-bore tunnel and two underground stations. Project complexity included twin-bore segmental tunnels in a seismically active, urban environment; 18-foot 10-inch inside diameter, single-pass lined tunnels.

COMPREHENSIVE TUNNELING EXPERIENCE INCLUDES: • Soft ground tunnels • Rock tunnels • Caverns • Shafts • SEM/NATM • Cut-and-cover structures • Immersed tunnels • Micro-tunneling and pipe jacking • Tunnel condition survey, inspection and rehabilitation • Geotechnical engineering • Rock mechanics and engineering geology • Geotechnical and geophysical investigations • GDR, GIR and GBR • Liner design • Excavation support • Underpinning, support and protection of existing structures • Settlement analysis and mitigation

• Ground/structure interaction • Seismic design and seismic retrofit of tunnels • Geotechnical and structural instrumentation • Ground improvement • Geohydrology/groundwater modeling • Dewatering • Waterproofing • Blast design and monitoring • Fire life safety • Tunnel ventilation • SES and CFD analyses • Feasibility and alternative analysis • Program management • Construction management and resident engineering • Underground construction and engineering services • Risk management • Peer and value engineering review • Constructability/construction phasing • Visualization and 4-D virtual construction

Presidio Parkway San Francisco, California

HNTB served as lead designer and provided construction design services for Phase II of the Presidio Parkway designbuild project, which links San Francisco to the North Bay in the heart of the Golden Gate National Recreation Area.

B&P Tunnel Replacement Project Baltimore, Maryland

HNTB is the project management consultant to Amtrak for the delivery of the Baltimore & Potomac Tunnel replacement project. The existing B&P Tunnel is more than 143 years old and is approaching the end of its useful life. While the tunnel currently remains safe for rail transportation, it requires substantial maintenance and it does not meet current design standards. The project will include two new high-speed (100+ MPH) tracks, is projected to cost approximately $3.5 billion and take 8 years to complete.

SR 99 Alaskan Way Viaduct and Seawall Replacement Seattle, Washington

HNTB is lead designer for the Washington State Department of Transportation’s SR 99 Alaskan Way Viaduct and Seawall Replacement project. The designbuild project is constructing the largest tunnel in the world with a two-level roadway to replace the aging, earthquake-damaged Alaskan Way Viaduct.

Elizabeth River Tunnels Norfolk, Virginia

HNTB is providing construction quality control services as part of the design-build contract for the Elizabeth River Tunnels public-private partnership project in Norfolk, Virginia. A component of the project, the new Midtown Tunnel is an allconcrete, immersed-tube tunnel adjacent to the 50-year-old Midtown Tunnel.

BART Silicon Valley Phase II

Minneapolis-St. Paul International Airport Light Rail Transit Tunnels and Lindbergh Station

San Jose, California

HNTB tunneling and geotechnical experts leveraged experience from other large underground transit projects in dense urban areas to recommend a single-bore tunnel option to reduce construction impacts downtown and potentially reduce construction cost. The 16-mile Bay Area Rapid Transit Silicon Valley extension will transform San Jose by significantly increasing residential and business density, while also improving regional connectivity, passenger travel times and access to downtown.

Minneapolis, Minnesota

The 10-mile multi-tunnel project is the longest airport airside tunnel system to accommodate a new baggage handling system, underground tugs, utilities and pedestrians. It was constructed using TBM, NATM and cut-and-cover methods.

Washington Dulles International Airport Tunnels Chantilly, Virginia

Leading design and construction, HNTB used multiple methods and designs to mine twin light-rail tunnels. The tunnels are the largest in the state and are believed to be the first large-diameter tunnels bored under an active commercial airfield.

For more information, please contact: Sanja Zlatanic, PE Chair, National Tunnel Practice szlatanic@hntb.com (646) 652-9440 Raymond Sandiford, PE East Region Lead rsandiford@hntb.com (917) 710-3395 Mark Stephani, PE Central Region Lead mstephani@hntb.com (917) 334-2731 Mike Wongkaew, Ph.D., PE, SE, PMP West Region Lead mwongkaew@hntb.com (425) 389-2281

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