United States Department of Transportation
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Evaluation of three methods to prevent further differential settlement on I-10 through McElroy swamp : final report.
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1989-02-01
[PDF-984.23 KB]
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Abstract:About an eight mile long section of Interstate 10 through McElroy Swamp in Ascension and St. James parishes have been undergoing excessive differential settlements for the past decade. The embankment was constructed by removing soft clay deposits of the fresh water swamp to the elevation of the underlying hard Pleistocene marine clay layer which is located 15 feet to 20 feet below natural ground level. Tests conducted by the Louisiana Transportation Research Center (LTRC), the Department of Transportation and Development (DOTD), and Louisiana State University (LSU) showed that the differential settlement found in this stretch of road is due to lack of density in the fill itself. Various methods of in-situ densification of the sand fill were tried. It was demonstrated that the embankment can be stabilized, and the differential settlements can be eliminated by using compaction grouting. Furthermore it was demonstrated that such could be achieved without destroying the pavement and without having to close I-10 to traffic at considerable savings as compared to other alternatives.
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