Full Displacement Piles: An Innovative Alternative to Typical Steel Piles-PPT Presentation

PPT Presentation

Pdf Summary

The presentation describes full-displacement drilled piles (FDPs) as an alternative to conventional driven steel piles for high-load developments in Newark, New Jersey. The site’s subsurface includes fill to about 17 feet, glacial lake deposits extending roughly 145–195 feet, weathered rock, and sandstone bedrock.<br /><br />Conventional HP14×117 piles were driven to depths of 155–176 feet and had an allowable compressive capacity of up to 235 tons. By comparison, the FDP design targeted 200 tons in compression and 130 tons in tension at 65 feet. Load testing showed increasing compressive capacity with depth: piles installed at 45, 55, and 64 feet achieved allowable capacities of 140, 180, and 260 tons, respectively. The production pile at 64 feet was rated for 130 tons in tension and 7 tons laterally.<br /><br />The presentation’s cost and productivity comparison estimated an average cost of $9,750 per FDP versus $14,450 per driven pile for the required capacity. For a 500-pile project, estimated installation time was 33 days with FDPs, compared with 125 days for driven piles.<br /><br />Reported benefits include lower costs, faster installation, shorter project schedules, reduced noise and vibration, high capacity at shallower depths, and minimal spoil.

Keywords

full-displacement drilled piles

FDP

drilled piles

driven steel piles

Newark New Jersey

load testing

compressive capacity

tension capacity

cost comparison

installation time