Numerical Simulation of Consolidation Settlement of Pervious Concrete Pile Composite Foundation under Road Embankment
Publication: International Journal of Geomechanics
Volume 16, Issue 1
Abstract
Having the advantages of high permeability and high strength, pervious concrete is suitable for improving ground-bearing capacity. In the Yellow River Delta, a pervious concrete pile (PCP) composite foundation has been constructed to reduce settlement of an expressway embankment. To study the working mechanism of PCPs, a numerical model was constructed based on the finite-difference method and Biot’s consolidation theory, which was validated by data from in situ tests. The excess pore-water pressure, pile–soil stress ratio, lateral displacement, and settlement of the PCP composite foundation under the loading of the road embankment were numerically calculated and compared with those of gravel pile and low-grade concrete pile composite foundations. Comparisons show that the dissipation of excess pore-water pressure in the PCP composite foundation was fastest, which implied that PCPs can significantly mitigate the development of excess pore-water pressure and thus enhance subsoil strength. Furthermore, the PCP composite foundation showed minimal postconstruction settlement and lateral displacement. Therefore, PCP is particularly suitable for reinforcing subsoil that has low strength and poor permeability.
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Acknowledgments
This work was supported by the National Program on Key Basic Research Project of China (973 Program, 2015CB058101), the Science Fund for Distinguished Young Scholars of Shandong Province (JQ201416), the Natural Science Foundations of China (51479105, 51279094, 51308324, and 51379115), the Program for New Century Excellent Talents in Univ. of Ministry of Education of China (NCET-13-0340), the Fundamental Research Funds of Shandong Univ. (2014YQ013), and the Natural Science Foundations of Shandong Province of China (ZR2013EEQ025).
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Published In
International Journal of Geomechanics
Volume 16 • Issue 1 • February 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: May 18, 2014
Accepted: May 5, 2015
Published online: Sep 14, 2015
Published in print: Feb 1, 2016
Discussion open until: Feb 14, 2016
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