Shear Zone around Jacked Piles in Clay
Publication: Journal of Performance of Constructed Facilities
Volume 29, Issue 6
Abstract
As the most important feature of jacked open-ended concrete pipe piles, shear zone has fluence of crucial importance during installing and after penetration. This study conducted a field test in silt deposit to observe the physical phenomenon of shear zone after installation and investigated soil parameter differences from undisturbed soil through laboratory tests. Direct observation on shear zone reveals that the boundary between shear zone and in situ soil is evident. The average soil thickness in the shear zone falls between 6 and 30 mm, which are closely related to natural water content and void ratio in different layers. Laboratory tests on the shear zone show evident compaction during installation, and the soil parameters in the shear zone are sensitive to the jacking installation procedure. Some soil parameters decrease, whereas others increase because of excess pore water dissipating after installation. The extent of the shear zone is helpful in understanding interface friction on pretensioned high-strength concrete (PHC) piles in clay.
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Acknowledgments
The authors would like to acknowledge the technical staff in the soil laboratory at Qingdao Technological University, China. The work presented in this paper is sponsored by the National Natural Science Fund (No. 51078196) and the Specialized Research Fund for the Doctoral Program of Higher Education of China. (No. 20093721110002).
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Published In
Journal of Performance of Constructed Facilities
Volume 29 • Issue 6 • December 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Apr 3, 2014
Accepted: Jul 18, 2014
Published online: Sep 26, 2014
Discussion open until: Feb 26, 2015
Published in print: Dec 1, 2015
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