I-564 Intermodal Connector

Project Summary

The I-564 Intermodal Connector project in Norfolk, VA will connect the existing I-564 through Naval Station Norfolk (NSN) and to the Norfolk International Terminals (NIT), part of the Port of Virginia. The new roadway, terminating near Hampton Boulevard (Route 337), will provide a safer high-speed highway that should decrease congestion, redirect heavy truck traffic from Norfolk city streets, and provide improved access for the 80,000 vehicles entering and exiting the navy base every day.

The project site consisted of subsurface compressible soils within the zone of influence of the newly placed approach fills. Thus, the primary challenges for this project were settlement management (primary and secondary) caused by the loads of the high approach embankments, long term creep and the effects the new abutment fills would have on existing site features (pile supported underpass, pile supported channel walls and an adjacent railway). Design methods to deal with the significant settlement predictions consisted of implementing Expanded Polystyrene (EPS) geofoam, wick drains, pile supported embankments (rigid inclusions with a load transfer platform) and staged fill placement. The 4 bridges across the project site are supported by H-piles, designed with negative skin friction considerations. This project employed a vast settlement monitoring program that consisted of survey monuments, settlement plates, vibrating wire piezometers, inclinometers and extensometers.