Simple Method to Predict Settlement of Composite Foundation under Embankment
Publication: International Journal of Geomechanics
Volume 18, Issue 12
Abstract
This paper presents a simple method to predict the settlement of the composite foundation with sparse prestressed tubular concrete (PTC) capped-piles under embankment. In this study, it is assumed that the distribution of skin frictions on PTC capped-piles is simplified as two force triangles, and a calculation model for predicting the additional stresses in the composite foundation soil is given. By combining Mindlin-Geddes and Boussinesq solutions, the equation of the additional stresses for a single PTC capped-pile foundation is derived considering the influence radius. A case history involving the installation of sparse PTC capped-piles for soil reinforcement under highway embankment is introduced, with a maximum settlement of 428 mm after construction. The predicted settlements of the composite foundation, resulting from the proposed method, are in good agreement with the observed data. Additionally, the additional stress field calculated shows a little change because the pile spacing is eight times larger than the pile diameter. Thus, the proposed method can optimize the design of the foundation soil reinforcement resulting from PTC piles.
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Acknowledgments
The research presented in this paper was financially supported by the National Nature Science Foundation of China (NSFC) (Grant 41702287), the Fundamental Research Funds for the Central Universities (Grant 300102218517), and the National Key R&D Program of China (Grant 2017YFC0805300). The financial supports are gratefully acknowledged.
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International Journal of Geomechanics
Volume 18 • Issue 12 • December 2018
Copyright
© 2018 American Society of Civil Engineers.
History
Received: Dec 7, 2017
Accepted: May 22, 2018
Published online: Sep 20, 2018
Published in print: Dec 1, 2018
Discussion open until: Feb 20, 2019
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