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http://dx.doi.org/10.7843/kgs.2022.38.3.5

Experimental Assessment of Reduction in the Negative Skin Friction Using a Pile with a Member Responding to Ground Deformation  

Shin, Sehee (Dept. of Civil and Environmental Eng., Incheon National Univ.)
Lee, Haklin (Dept. of Civil and Environmental Eng., Incheon National Univ.)
Woo, Sang Inn (Dept. of Civil and Environmental Eng., Incheon National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.38, no.3, 2022 , pp. 5-16 More about this Journal
Abstract
Ground in extremely cold and hot regions can sink by various environmental factors. Ground settlement can generate the negative skin friction to pile shaft, increase the base load of pile, and cut the stability of the pile. This study proposed a member responding ground deformation which can be inserted inside the pile. The member slightly compresses according to the ground settlement to reduce the negative skin friction. As the member materials, this study considered spring and spring-dashpot. To assess the ability of the member, the present research performed model tests for piles with or without the member within settled ground. In the model tests, the base load, total shaft resistance, and horizontal earth pressure were monitored and analyzed. Experimental results show that the pile with spring member can reduce the negative skin friction under small settlement conditions whereas it acts similar to the pile without the member under large settlement conditions as the spring was no longer compressed. However, the pile with the spring-dashpot member can reduce the negative skin friction continuously upon the ground settlement as the dashpot delays the load transfer to the spring and locates friction force on the unloading path.
Keywords
Load transfer mechanism; Pile; Sand; Settlement; Shaft frirction;
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