DBA Services: DBA performed geotechnical engineering and design of the drilled shaft foundations for the main bridge piers and the high level approach spans. Other services included:
QA review of the geotechnical reports for the pile supported approach bridges
Developing and analyzing the drilled shaft load test plan
Geotechnical engineering consulting during trial shaft installation
Geotechnical engineering consulting during production shaft construction
Project Highlights: The John James Audubon Bridge is a new Mississippi River crossing between Pointe Coupee and West Feliciana parishes in south central Louisiana, replacing an existing ferry service. The project includes 12 miles of roads and 8 bridges – 7 approach structures and the main structure over the river. The seven approach bridges are supported on driven prestressed precast concrete (PCC) piles. The river bridge has 4 lanes and is almost 2.5 miles long with prestressed PCC pile supported low level approaches, drilled shaft supported high approaches, and the longest cable-stayed main span in North America. The cable-stayed span is supported by two main piers in the Mississippi River. Each pier has twenty 8-foot diameter tip grouted drilled shafts as its foundation system.