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 With more than 30 years of tunneling experience, GZA provides engineering for design and construction of shafts, tunnels, and underground chambers in soil and rock. Tunnel construction involves many risks related to soil, rock and groundwater conditions. Through evaluation of ground conditions and a thorough knowledge of construction methods, GZA helps clients manage these risks. The firm's experience includes sewer, water, highway, rapid transit, power tunnels and caverns.
Tunnel engineering services include:
 Alignment Selection
- Geotechnical Data and Interpretive Reports
- Geotechnical Baseline Reports
- Tunneling Machine Performance Studies
- Drill-and-blast Evaluation
- Ground Support Design
- Groundwater Control System Design
- Subsidence Control
- Raise-bore Evaluations
- Tunnel Muck Management
- Subsurface Explorations
- Geotechnical Instrumentation
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Major Tunnel Projects:
New York. Massachusetts. Ohio. Rhode Island. Washington. Florida. Michigan. Illinois. Maryland. Pennsylvania. Washington, DC. West Virginia. Kentucky. Tennessee.
New Mexico. Nevada.
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Recent Tunnel Projects Include:
First Avenue Steam Tunnel, Metrowest Water Supply Tunnel, Inter-Island Wastewater Conveyance Tunnel, Central Artery Third Harbor Tunnel, Eastside Access Tunnel, West Branch Interceptor Tunnel, E. 63rd Subway, WMATA, Sound Transit, Second Avenue Subway, Braintree-Weymouth Tunnel, Buffalo Light Rail, Brightwater Conveyance Tunnel, Narragansett Bay Commission CSO, Dorchester Bay CSO, CTA Block 37, Port Richmond Interceptor Tunnel
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