Deterioration of Soil-Cement Piles in a Saltwater Region and Its Influence on the Settlement of Composite Foundations
Publication: Journal of Performance of Constructed Facilities
Volume 30, Issue 1
Abstract
Soil-cement mixed piles are widely used to improve soft subsoil. But in regions with high-salinity groundwater, the soil-cement is susceptible to deterioration. At present, however, the design code for soil-cement pile composite foundations does not consider the deterioration effect of soil-cement. The saltwater region in the Yellow River Delta of China is used as a case study. Based on early strength tests of soil-cement, a practical prediction method for the lifecycle bearing capacity of soil-cement piles is put forward, and the influence of deterioration on the settlement of composite foundations is studied using model tests and numerical simulation. The prediction method of pile bearing capacity considers the progressive deterioration of soil-cement, and it shows that the deterioration of soil-cement has a great influence on bearing capacity of mixed piles with an increase in age, and the loss ratio of bearing capacity quickly reduces with a decrease in pile diameter. The deterioration also increases the settlement of composite foundations. Furthermore, pile defects aggravate the deterioration effects of soil-cement piles on the settlement of composite foundations.
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Acknowledgments
This work was supported by the Natural Science Foundations of China (Nos. 51279094, 51078222, 51308324, 51379115, and 51479105), the Independent Innovation Foundation of Shandong University (IIFSDU) (Nos. 2010JQ001 and 2012HW003), the Natural Science Foundations of Shandong Province of China (No. ZR2011EEM012), and the Program for New Century Excellent Talents in University of Ministry of Education of China (NCET-13-0340).
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Published In
Journal of Performance of Constructed Facilities
Volume 30 • Issue 1 • February 2016
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Dec 23, 2013
Accepted: Oct 20, 2014
Published online: Dec 1, 2014
Discussion open until: May 1, 2015
Published in print: Feb 1, 2016
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