Abstract
This paper introduces installation procedures of root piles, and then presents the results of an experimental study on the behavior of a root pile in Chizhou Yangtse River Bridge. In order to investigate the capacity response of root piles and the effect of roots on shaft resistance, O-cell test and conventional head-down test were conducted on a root pile, with diameter of 1.8 m and length of 49 m. The pile was instrumented with strain gauges along the steel bars of pile in load tests to measure the load distribution along the length of the test pile, as well as its shaft resistance. The research demonstrates that the existence of roots affects the value of average compressive stiffness in O-Cell test, and also changes the transform character of axial loads significantly; the difference between the shaft resistance with roots and that without roots is increase with the increase of load; the existence of roots increased shaft resistance at pile section with roots, but it decreased shaft resistance at the adjacent segments without roots, These positive and negative effects are influenced by the distribution of roots and loading strategy.
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Acknowledgments
This work was supported by China Scholarship Council, National Key Research Program of China (2017YFC0703408) and National Natural Science Foundation of China (51878160) and (51808112), Jiangsu Fundamental Research Program (Natural Fund Project) (BK20180155).
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Li, Xj., Dai, Gl., Gong, Wm., Zhu, Mx. (2020). Experimental Investigations of Capacity Response of Root Piles on Combination of O-Cell Test and Conventional Head-Down Test Methods. In: Pinto, P., Ou, CY., Shehata, H. (eds) Innovative Solutions for Deep Foundations and Retaining Structures. GeoMEast 2019. Sustainable Civil Infrastructures. Springer, Cham. https://doi.org/10.1007/978-3-030-34190-9_3
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