Abstract
The Louisiana DOTD is constructing an elevated highway between Golden Meadow and Fourchon in southern Louisiana to replace the existing Highway Louisiana 1 which is prone to flooding and closure under severe weather. The proposed design calls for the construction of approximately 27.4 km of access- controlled, elevated roadway consisting of low-level and medium-level bridges, two elevated interchanges, and one fixed high-level bridge over Bayou LaFourche with a 107-m main span. As part of the design, a pile load test program was conducted at selected locations along the proposed highway alignment. The load test program verified that pile capacity and length predictions can be made with confidence based on the borings and Cone Penetrometer soundings conducted during the geotechnical investigation of the site. It also confirmed that axial loads at least 50% greater than those tabulated in the LA-DOTD Bridge Design Manual can be achieved at this site for prestressed concrete piles in the size range of 0.41 to 0.76-m (16 to 30 inches). A third finding is that significant pile set up (increase in axial capacity over time after driving) occurs in the site's soils.
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