Abstract
This paper presents an investigation into the settlement of the composite foundation with sparse PTC (pre-stressed tubular concrete) capped-piles under embankment by theory analysis. Based on the assumption that the distribution of skin frictions on PTC capped-piles is simplified as two triangles, a method for calculating the additional stresses of the composite foundation with sparse PTC capped-piles is proposed. By the combination of Mindlin-Geddes’ solution and Boussinesq’s solution, the formula of additional stresses of single PTC capped-pile foundation is derived by considering the radius of influence range. A case history of highway embankment construction conducted in Jiangsu province, which involved installation of sparse PTC capped-piles for soil reinforcement, was briefly introduced and analyzed, and the observed settlements after completion of the embankment construction reached to 428 mm. The proposed method and the layer-wise summation method were adopted to calculate the settlement of the composite foundation with sparse PTC capped-piles. The comparison results indicate that the calculated settlement of the composite foundation have a good agreement with the field data. The analysis results also suggest that, when the diameter of influence range is eight times larger than the diameter of the pile, the additional stress field shows no significant variation with increasing the influence range.
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Acknowledgments
The research described in this study was funded by the National Nature Science Foundation of China (NSFC) (Grant No. 41702287), the Fundamental Research Funds for the Central Universities (Grant No. 310821161022 and 310821153312), and China Postdoctoral Science Foundation (2015M570803 and 2016T90877). These financial supports are gratefully acknowledged.
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Wang, B.ZF., Wang, YQ., Cheng, J.WC. (2019). Settlement of Composite Foundation with Sparse PTC (Pre-stressed Tubular Concrete) Capped-Piles Under Embankment. In: Wang, S., Xinbao, Y., Tefe, M. (eds) New Solutions for Challenges in Applications of New Materials and Geotechnical Issues. GeoChina 2018. Sustainable Civil Infrastructures. Springer, Cham. https://doi.org/10.1007/978-3-319-95744-9_15
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