Most DB projects are awarded before the geotechnical and subsurface investigations are complete, a situation is created where geotechnical uncertainty is generally high, and the winning design-builder is expected to conduct those investigations after it has committed itself to a firm fixed price for design and construction. Risk is a function of perception and both owners and their industry partners agree that geotechnical risk is perceived to be high as well. The Federal Highway Administration requires a differing site conditions (DSC) clause in all federal-aid projects EXCEPT those delivered using design-build (DB). Without a DSC clause that allocates this risk, the study found that members of the DB industry perceive that the risk is much higher than the DOT geotechnical staffs. The result is a failure to align perceptions of the geotechnical risk profile, which in turn results in higher costs due to contingencies included in the DB price proposals. The presentation will present the results of recent research funded by the Transportation Research Board that documented proven strategies and tools for managing subsurface risk in DB projects.
Participants will learn to identify the subsurface risk profile for DB projects.
Participants will be introduced to five strategies for aligning perceived geotechnical risk.
Participants will learn about effective practices for managing geotechnical risk during the pre- and post-award phases of a DB project.
Participants will be able to determine whether or not a differing site conditions (DSC) clause is appropriate for a given DB project.
PhD, DBIA, PE,
Professor of Civil and Construction Engineering,
Iowa State University
Geotechnical Risk Exam
1.00 - Continuing Education Units
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