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CPT Measurements near Drilled Displacement Piles
Drilled displacement piles (also known as augered cast-in-place displacement piles or augured, pressure-grouted displacement piles) are installed by the displacement of soil and subsequent placement of cement grout within the evacuated volume. Depending on the soil grain-size characteristics, soil behavior, in situ soil density, pile spacing, and pile diameter, the installation process can result in measurable densification and an increase in lateral stress. Cone penetration testing was performed at a beachfront site in Myrtle Beach, South Carolina. Baseline data were collected for the natural ground conditions and compared to data collected adjacent to a single drilled displacement pile and within groups of drilled displacement piles. The data, which are presented as a ratio of the post-installation measurements to the pre-installation measurements, support that the installation of drilled displacement piles in granular soil results in a substantial increase in tip resistance and sleeve friction as measured in the CPT. As may be expected, measurements near a single pile show that the measured post-installation tip resistance reduces as the distance from the pile increases. Within pile groups, the post-installation tip resistance in looser sands increases as the pile spacing decreases.
CPT Measurements near Drilled Displacement Piles
Drilled displacement piles (also known as augered cast-in-place displacement piles or augured, pressure-grouted displacement piles) are installed by the displacement of soil and subsequent placement of cement grout within the evacuated volume. Depending on the soil grain-size characteristics, soil behavior, in situ soil density, pile spacing, and pile diameter, the installation process can result in measurable densification and an increase in lateral stress. Cone penetration testing was performed at a beachfront site in Myrtle Beach, South Carolina. Baseline data were collected for the natural ground conditions and compared to data collected adjacent to a single drilled displacement pile and within groups of drilled displacement piles. The data, which are presented as a ratio of the post-installation measurements to the pre-installation measurements, support that the installation of drilled displacement piles in granular soil results in a substantial increase in tip resistance and sleeve friction as measured in the CPT. As may be expected, measurements near a single pile show that the measured post-installation tip resistance reduces as the distance from the pile increases. Within pile groups, the post-installation tip resistance in looser sands increases as the pile spacing decreases.
CPT Measurements near Drilled Displacement Piles
Siegel, Timothy C. (author) / Cargill, P. Ethan (author) / NeSmith, Willie M. (author)
Seventh International Symposium on Field Measurements in Geomechanics ; 2007 ; Boston, Massachusetts, United States
FMGM 2007 ; 1-12
2007-09-21
Conference paper
Electronic Resource
English
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