P–Y Approach for Laterally Loaded Piles in Frozen Silt
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 143, Issue 5
Abstract
Frozen soils, including seasonally frozen soils and perennially frozen ground, or permafrost, exist extensively in Alaska and other cold regions. During past earthquakes, extensive damages were observed in pile foundations, and frozen ground appears to be the direct cause of at least some of those damages. This paper analyzes frozen soil lateral resistance and its effects on pile foundations during earthquakes based on the testing results on reinforced concrete-filled steel-pipe piles embedded in deep seasonally frozen silts under large deflection and recommends an analysis tool for seismic design practices. Pile performance data measured in the test—including bending moment and deflection—were used to back-calculate the values for the top half-meter of frozen silt. A curve for frozen silt is proposed based on the experimental data. Results from modeling the test pile using the proposed curve agree well with the test results. The proposed curve was further validated by independent field test data. It is concluded that the proposed curve is capable of modeling both seasonally frozen and perennially frozen silts in frozen soil-pile interaction analyses during short-term lateral loading. Recommendations are provided on how to select soil parameters for constructing frozen-silt curves.
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Acknowledgments
This research was jointly supported by a grant from the Alaska University Transportation Center and the State of Alaska Department of Transportation and Public Facilities (DOT&PF) under Project AUTC 107014. Partial support for the second author was provided by an Open Research Fund (SKLFSE201306) from the State Key Laboratory of Frozen Soil Engineering, Lanzhou, China. These supports are greatly appreciated. The authors are very grateful to Mr. Elmer Marx, senior bridge design engineer at State of Alaska DOT&PF, and the two anonymous reviewers for their comments that helped improve this manuscript.
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Published In
Journal of Geotechnical and Geoenvironmental Engineering
Volume 143 • Issue 5 • May 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Dec 3, 2015
Accepted: Apr 7, 2016
Published online: Jan 24, 2017
Published in print: May 1, 2017
Discussion open until: Jun 24, 2017
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