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>Variability of Pile-Soil Interaction: A Comparison of Behavior Seen in Instrumented Pile Pairs at Three MnDOT Bridge Sites
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Variability of Pile-Soil Interaction: A Comparison of Behavior Seen in Instrumented Pile Pairs at Three MnDOT Bridge Sites
The Minnesota Department of Transportation has instrumented several driven pile bridge foundations with the intent of gaining an improved understanding of complex pile-soil interaction given various construction layouts, structural and earth fill loading sequences, and geotechnical site conditions. Axial pile loading behavior was examined throughout construction and into bridge service as part of a bridge performance monitoring program. Three similar case studies of instrumented pile pairs at bridge abutments are examined: a comparison of the behavior of a pile within an existing roadway footprint and a pile installed in a widened side-hill fill on a bridge reconstruction project; a comparison of interaction between leading and trailing row piles in a 3-row pile group; and a comparison of pile loads seen on a pile in an integral abutment and a structurally unloaded pile positioned outside the pile cap. These sites have allowed unique observations and interesting conclusions relative to pile-soil interaction.
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