Application of p-y approach in analyzing pile foundations in
frozen ground overlying liquefiable soils |
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| Authors: | ZhaoHui Yang XiaoYu Zhang XiaoXuan Ge and Elmer E Marx |
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| Institution: | Dept. of Civil Engineering, University of Alaska Anchorage, 3211 Providence Dr., Anchorage, AK 99508, USA;PND Engineers, Inc., 1506 West 36th Ave., Anchorage, AK 99503, USA;Northern Geotechnical Engineering, Inc., 11301 Olive Lane, Anchorage, AK 99515, USA;State of Alaska DOT&PF, Bridge Section, 3132 Channel Drive, Juneau, AK 99801, USA |
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| Abstract: | Two major earthquakes in Alaska, namely the 1964 Great Alaska Earthquake and the 2002 Denali Earthquake, occurred in winter
seasons when the ground crust was frozen. None of the then-existing foundation types was able to withstand the force from the
lateral spreading of frozen crust. This paper presents results from the analysis of pile foundations in frozen ground overlying liquefiable
soil utilizing the Beam-on-Nonlinear-Winkler-Foundation (BNWF) (or p-y approach). P-multipliers were applied on traditional
sandy soil p-y curves to simulate soil strength degradation during liquefaction. Frozen soil p-y curves were constructed
based on a model proposed in a recent study and the frozen soil mechanical properties obtained from testing of naturally frozen
soils. Pile response results from the p-y approach were presented along with those from fluid-solid coupled Finite Element (FE)
modeling for comparison purpose. Finally, the sensitivity of pile response to frozen soil parameters was investigated and a brief
discussion is presented. |
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| Keywords: | frozen ground crust lateral spreading liquefaction p-y approach pile foundation |
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