Case History of Installing Instrumented Jacked Open-Ended Piles
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 138, Issue 7
Abstract
Construction effects on pile-soil systems arise from the process of installing displacement piles. This study conducted a comprehensive field test program complemented with laboratory tests to observe the performance of jacking open-ended concrete pipe piles into silt deposits. The jacked piles were examined in a plugged mode during installation. Direct observation on the soil plugs reveal that their formation generally accords with the stratigraphic nature of the layered soils. Soil-arching behavior during pile penetration causes the soil in the shear zone along the inner pipe wall to mainly come from the uppermost layer of the deposit. Laboratory tests on the soil plug shows evident compaction and the tendency increased strength over time. The buildup of the excess pore pressure and radial total stress in the soil is sensitive to the jacking installation procedure. By taking into account the soil displacement related to the plugging degree, the captured peak excess pore pressure at a given horizon can be modeled by the cavity expansion theory that normally adapts to closed-ended pile. The jacking annulus resistance normalized by the cone tip resistance is independent of the penetration depth and the degree of plugging. A considerable portion of the annulus resistance is locked in the pile after installation, decreases a little during adjacent pile installation, and remains stable over a long period.
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Acknowledgments
The writers would like to acknowledge the technical staff in the Key Laboratory on Soft Soil and Geo-Environmental Engineering at Zhejiang University, China. The work presented in this paper was sponsored by the National Natural Science Fund (No. 51078330) and the Natural Science Fund of Zhejiang (No. Y1090610), China.
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© 2012. American Society of Civil Engineers.
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Received: Nov 3, 2009
Accepted: Sep 21, 2011
Published online: Sep 23, 2011
Published in print: Jul 1, 2012
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