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Analysis of Laterally Loaded Piles in Frozen Soils
Frozen soils, including both those seasonally frozen as well as permafrost, exists extensively in Alaska and other cold regions. During past earthquakes, extensive damages were observed in deep foundations in the ground, and frozen ground appears to be the direct cause of at least some of those damages. The purpose of this study is to investigate the effects of seasonally-frozen soil on deep foundations during earthquakes, as well as to recommend simplified tools for seismic design practices. Reinforced concrete-filled steel pipe piles were constructed at an outdoor test site in Fairbanks, Alaska, and quasi-static lateral load tests were performed when deep seasonally frozen silts were present. Pile performance data measured in the test - including bending moment and deflection - were used to back-calculate the p-y values for the top 20 inches (0.5 m) of frozen silt. A p-y curve for frozen silt was proposed based on the experimental data. Results from modeling the test pile using the proposed p-y curve and LPile program agree with the test results. The proposed p-y curve was further validated by data from an independent field test. It is concluded that the proposed p-y curve is capable of modeling frozen soil-pile interaction during lateral loading and can be used in design practice analysis of laterally loaded piles embedded in frozen silt.
Analysis of Laterally Loaded Piles in Frozen Soils
Frozen soils, including both those seasonally frozen as well as permafrost, exists extensively in Alaska and other cold regions. During past earthquakes, extensive damages were observed in deep foundations in the ground, and frozen ground appears to be the direct cause of at least some of those damages. The purpose of this study is to investigate the effects of seasonally-frozen soil on deep foundations during earthquakes, as well as to recommend simplified tools for seismic design practices. Reinforced concrete-filled steel pipe piles were constructed at an outdoor test site in Fairbanks, Alaska, and quasi-static lateral load tests were performed when deep seasonally frozen silts were present. Pile performance data measured in the test - including bending moment and deflection - were used to back-calculate the p-y values for the top 20 inches (0.5 m) of frozen silt. A p-y curve for frozen silt was proposed based on the experimental data. Results from modeling the test pile using the proposed p-y curve and LPile program agree with the test results. The proposed p-y curve was further validated by data from an independent field test. It is concluded that the proposed p-y curve is capable of modeling frozen soil-pile interaction during lateral loading and can be used in design practice analysis of laterally loaded piles embedded in frozen silt.
Analysis of Laterally Loaded Piles in Frozen Soils
Yang, Zhaohui (author) / Li, Qiang (author) / Horazdovsky, Jacob (author) / Marx, Elmer (author)
GeoCongress 2012 ; 2012 ; Oakland, California, United States
GeoCongress 2012 ; 215-224
2012-03-29
Conference paper
Electronic Resource
English
Analysis of Laterally Loaded Piles in Frozen Soils
| British Library Conference Proceedings | 2012
Analysis of Laterally Loaded Piles in Liquefiable Soils with a Frozen Crust
| British Library Conference Proceedings | 2012