The Virginia Department of Transportation (VDOT) planned to improve and widen Fall Hill Avenue and Mary Washington Boulevard in the City of Fredericksburg, Virginia. The project included design and construction of a new a four-lane, 414-foot long, 5-span bridge over the north and southbound lanes of Interstate 95, 1,800 linear feet of new four-lane roadway, widening of about 2 miles of existing roadway, and ancillary minor structures along the improved roadway alignment.
F&R provided geotechnical services for the project that included the following:
- Analyzing and developing deep foundation support recommendations for the 4-span bridge in accordance with AASHTO LRFD Bridge Design Specifications, including considerations for vertical and lateral movements and downdrag due to adjacent new approach fill placement;
- Analyzing and developing recommendations for flexible pavement design of roadways for design traffic volumes of up to 32,000 vehicles per day;
- Analyzing and providing recommendations for slopes and retaining walls planned for development of bridge abutments and approaches, and
- Providing construction recommendations in accordance with VDOT requirements for minor structures and construction activities anticipated on the project.
To accomplish the geotechnical design goals, F&R developed and executed a subsurface exploration and laboratory testing program in accordance with the VDOT Manual of Instruction (MOI) that consisted of 98 test borings, pavement cores, traffic control coordination, and laboratory testing in AASHTO accredited labs.