United States Department of Transportation
i
NextScour Case Study: The I–6064/I–95 Bridge Replacements Over the Lumber River in Lumberton, NC
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2024-02-01
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[PDF-3.64 MB]
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Edition:Research Report
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Abstract:The North Carolina Department of Transportation (NCDOT) plans to replace two highway bridges on I–6064/I–95 over the Lumber River in Lumberton, NC. Hydraulic scour analysis of the planned bridge replacement resulted in deep scour depths, which NCDOT believed were excessive due to subsurface layers of cohesive soil that existed across the bridge site. NCDOT reached out to the Federal Highway Administration (FHWA) to inquire if FHWA’s NextScour Research Initiative could potentially reduce the scour design depths. Through Transportation Pooled Fund study TPF-5(461), Soil and Erosion Testing Services for Bridge Scour Evaluations, FHWA performed four tasks for NCDOT that are summarized in this report (FHWA 2020a). Task 1: Perform hydraulic modeling of the site to obtain flow velocities and bed shear stresses. Task 2: Perform soil erosion testing on the cohesive soil to determine the clay’s critical shear stress. Task 3: Develop decay functions to establish the relation between hydraulic loads and depth. Task 4: Conduct longitudinal scour analysis at the vertical wall at the downstream bend. This research study showed that the cohesive layer of clay at the site could potentially stop the scour at this bridge site, and the NextScour methodology is a developing tool to improve accuracy for bridge foundation design.
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