Field testing of jet-grouted pile : [summary].
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Field testing of jet-grouted pile : [summary].

Filetype[PDF-971.38 KB]


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      In many areas of Florida, local geology dictates the use of deep foundations for transportation structures — bridges, noise walls, signage, etc. When concrete piles are used, they are either prestressed at the casting yard, cast in situ through a hollow stem auger, or cast in place into an excavated shaft. The deep foundation type studied in this project aims to increase the resistance of soils along the side and tip of a pre-cast pile to accelerate construction and decrease material costs through the use of shorter elements.

      University of Florida researchers tested a deep foundation concept developed for the Florida Department of Transportation (FDOT), the jet-grouted precast pile. This pile type is constructed in four stages: (1) Casting the concrete pile with built-in piping for jetting and grouting; (2) Jetting the pile into the ground using pressurized water; (3) Side grouting the pile; and (4) tip grouting. Precasting, jetting, and grouting may improve on currently used foundations for appropriate subsurface conditions: jetting minimizes noise and vibration, compared to driven piles; precasting reduces pile integrity issues, compared to cast-in-place piles; and side and tip grouting improve skin and tip resistance.

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