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http://dx.doi.org/10.7843/kgs.2009.25.9.5

A Program Development for Prediction of Negative Skin Friction on Piles by Consolidation Settlement  

Kim, Hyeong-Joo (School of Civil and Environmental Engrg., Kunsan National Univ.)
Mission, Jose Leo C. (School of Civil and Environmental Engrg., Kunsan National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.25, no.9, 2009 , pp. 5-17 More about this Journal
Abstract
The microcomputer program PileNSF (Pile Negative Skin Friction) is developed by the authors in a graphical user interface (GUI) environment using $MATLAB^{(R)}$ for predicting the bearing capacity of a pile embedded in a consolidating ground by surcharge loading. The proposed method extends the one-dimensional soil-pile model based on the nonlinear load transfer method in OpenSees to perform an advanced one-dimensional consolidation settlement analysis based on finite strain. The developed program has significant features of incorporating Mikasa's finite strain consolidation theory that accounts for reduction in the thickness of the clay layer as well as the change of the soil-pile interface length during the progress of consolidation. In addition, the consolidating situation of the ground by surcharge filling after the time of pile installation can also be considered in the analysis. The program analysis by the presented method has been verified and validated with several case studies of long-term test on single piles subjected to negative skin friction. Predicted results of negative skin friction (downdrag and dragload) as a result of long from consolidation settlement are shown to be in good agreement with measured and observed case data.
Keywords
Finite strain consolidation theory; Negative skin friction; Nonlinear load transfer method; Piles;
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