DFI Journal - The Journal of the Deep Foundations Institute
Volume 16, Issue 1, April 2022
DOI: 10.37308/DFIJnl.20220209.249
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Increase of CPT Cone Resistance in Sand Due to Installation of Press-In Piles
Article Type: Opinion Paper/Forums
Fellenius, B. & Tan, S. A.
Abstract
A pile testing programme in Tuas Racetrack, South-west Singapore, involved installing 600-mm diameter 30 m long, closed-toe, spun piles by jacking (press-in system) through about 10 m thick loose hydraulic sand fill and 20 m of marine clay, sandy silt, and into weathered mudstone. Static cone penetrometers soundings, CPTU, were pushed both before and after the pile installation at each pile location and two distances away from the test pile. The post-test CPTU soundings showed that the press-in installation resulted in significant increase of cone resistance in the sand fill even at several pile diameters away from the piles. No similar effect occurred in the natural soils.
Keywords:
Spun piles, CPTU sounding, strain gage instrumentation, installation effect