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Numerical Evaluation of Pile Installation Effects as Settlement Reducers for Concrete Tracks  

Lee Su-Hyung (Korea Railroad Research Institute)
Publication Information
Journal of the Korean Geotechnical Society / v.21, no.10, 2005 , pp. 73-83 More about this Journal
Abstract
Recently, foundation designs based on piled raft concept have been increasing, where the piles are required not to ensure the overall stability of the foundation but to act as settlement reducer. When a concrete track is constructed on soft ground, excessive settlements may occur, while it rarely has bearing capacity problems. In this case, the settlement of the concrete track may be effectively reduced by arranging a small number of small-diameter piles beneath the track. This paper presents the effect of pile installation on the reduction of concrete track's settlement. A 3D finite difference method was employed to model the piled concrete tracks. A parametric study was carried out to assess the effect of varying soil condition and pile arrangements. From the analysis results, it is verified that the effect of the pile installation is significant to effectively reduce the settlement of concrete track. Optimal number of pile rows and pile spacings was proposed for the economical design of a piled concrete track. The bearing mechanism of piles was also investigated by analyzing load sharing characteristics of pile according to soil conditions and pile arrangements.
Keywords
Concrete track; Pile; Pile arrangement; Piled raft; Settlement;
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