Abstract
Subgrade reactions should be properly evaluated to simulate pile stress under large earthquakes. The subgrade reaction of piles is known to be strongly influenced by soil types (e.g., sand and clay), contact conditions at the pile–soil interface (e.g., separation and friction), and the effect of a pile group (e.g., pile arrangement and configurations). Therefore, this study explains the influence of soil types and contact conditions on the subgrade reaction of single piles and three-pile groups with series arrangement. For this purpose, a dynamic lateral loading analysis of soil–pile systems was conducted based on a nonlinear finite element method. The following conclusions were obtained from the analysis:
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(1)
The pile arrangements, soil types, and contact conditions influenced the hysteresis curve of the subgrade reactions.
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(2)
The slip displacement of the subgrade reaction was influenced by the pile arrangement caused by the effect of the pile group. Friction reduced the slip displacement for sand.
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(3)
The equivalent stiffness and the equivalent damping ratio of the subgrade reaction were influenced by the pile arrangement. Friction and separation influenced these values for sand and clay, respectively.
These findings will contribute to realizing an improved dynamic soil–pile system model to better understand the seismic response of a pile-supported building.
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Acknowledgments
This work was supported by JSPS KAKENHI Grant Number JP17H06837.
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Nakano, T., Miyamoto, Y. (2019). Dynamic Nonlinear Horizontal Resistance of Pile Group Considering Soil Types and Pile–Soil Contact Conditions. In: El-Naggar, H., Abdel-Rahman, K., Fellenius, B., Shehata, H. (eds) Sustainability Issues for the Deep Foundations. GeoMEast 2018. Sustainable Civil Infrastructures. Springer, Cham. https://doi.org/10.1007/978-3-030-01902-0_2
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DOI: https://doi.org/10.1007/978-3-030-01902-0_2
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