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http://dx.doi.org/10.14481/jkges.2017.18.5.5

A Study of Governing Factors on the Engineering Behaviour of a Single Pile in Consolidating Ground  

Kim, Sung-Hee (Department of Civil Engineering, Kangwon National University)
Jeon, Young-Jin (Department of Civil Engineering, Kangwon National University)
Kim, Jeong-Sub (Department of Civil Engineering, Kangwon National University)
Lee, Cheol-Ju (Department of Civil Engineering, Kangwon National University)
Publication Information
Journal of the Korean GEO-environmental Society / v.18, no.5, 2017 , pp. 5-16 More about this Journal
Abstract
In the present work, a number of advanced three-dimensional (3D) parametric finite element numerical analyses have been conducted to study the behaviour of a single pile in consolidating ground from coupled consolidation analyses. A single pile with typical minimum and maximum ranges of fill height and clay stiffness has been modelled. The computed results demonstrate that the higher the height of the fill above the clay surface and the smaller the stiffness of the clay, the higher the dragloads and the negative skin friction-induced pile settlements. It has been found that the development of dragloads and pile settlement is more governed by the stiffness of the clay rather than the height of the fill. Positive shaft resistance is mobilised only after the average degree of consolidation is larger than 50%. Although the pile is installed when the degree of consolidation is 50% or more, relatively large negative skin friction can nevertheless develop on the pile. On the other hand, when a load is applied on the pile experiencing an increase in the negative skin friction with time during consolidation, the pile undergoes a large increase in the final settlement of up to 95% compared to that of a pile without axial load on the pile head. The allowable pile capacity when there is negative skin friction on the pile is reduced by about 4-11% compared to a pile without negative skin friction.
Keywords
Design of piles; Negative skin friction; Numerical modelling and analysis; Piles; Soft ground;
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Times Cited By KSCI : 3  (Citation Analysis)
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