SPR 22-625, Developing Guidelines for Evaluating Pressure on Existing Culverts under New Embankments with Buried Lightweight Materials when Highway Widening

Grants and Contracts Details

Description

PROBLEM STATEMENT Existing culverts are often left in place and extended with highway widening projects. Many existing Reinforced Concrete Box Culverts (RCBCs) were built using stepped construction, with slab thickness decreasing as the embankment height decreases along the culvert. With widening projects, lightweight fill is often used above the thinner culvert sections so the net load on the culverts is not increased. This type of construction has been performed with stepped-down culverts on I-75 and I-64 interstate widening projects. The current method of calculating culvert pressures assumes a vertical column of material and has been found through field instrumentation to be conservative for geofoam and non-conservative for foam concrete. OBJECTIVES Develop guidelines/empirical formulas by using test data, in-situ data and numerical simulation results for evaluating pressure on existing culverts under new embankments with buried lightweight materials when highway widening.
StatusActive
Effective start/end date7/1/216/30/24

Funding

  • KY Transportation Cabinet

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