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http://dx.doi.org/10.14481/jkges.2020.21.8.15

A Study on the Negative Skin Friction based on Measurements from Existing Works Analysed by 3D Finite Element Analyses  

Jeon, Sang Joon (Department of Civil Engineering, Kangwon National University)
Jeon, Young Jin (Department of Civil Engineering, Kangwon National University)
Jeon, Seung Chan (Civil Engineering Division, Dongbu Engineering & Construction Corporation)
Lee, Cheol Ju (Department of Civil Engineering, Kangwon National University)
Publication Information
Journal of the Korean GEO-environmental Society / v.21, no.8, 2020 , pp. 15-27 More about this Journal
Abstract
In the current paper, a series of advanced 3D finite element analyses have been performed on existing pieces of work of negative skin friction from a geotechnical centrifuge test and full-scale field measurements. From these analyses, key features of pile behaviour under the influence of negative skin friction which, previously, were not fully understood in existing studies, have been meticulously discussed. As such, it has been possible to successfully address several numerical modelling issues such as negative skin friction induced pile settlements and group effects (the shielding effect), the effect of sacrificial piles in groups and the interaction between the pile head and the cap, the effect of interface elements at the pile-soil interface and the time-dependent pile behaviour. During a geotechnical centrifuge test, substantial amounts of negative skin frictions were mobilised when centrifugal acceleration increased from 1g to a certain g-level due to an increase in the self-weight of soil. The behaviour of piles inside a group were heavily affected by the sacrificial piles and the connectivity between the pile head and the pile cap. In particular, as negative skin friction has time dependent qualities associated with consolidation, it was logical to perform coupled analyses when analysing piles in consolidating grounds. From the current work, several insufficiencies of previous researches have been addressed, and the engineering pile behaviour subjected to negative skin friction has been clarified.
Keywords
3D numerical modelling; Case histories; Group effect; Negative skin friction; Piles; Soft soils;
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