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Load-bearing performance of caisson-bored pile composite anchorage foundation for long-span suspension bridge: 1-g model tests

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Abstract

The caisson-bored pile composite anchorage (CBPCA) foundation, as a new form of gravity-type foundation for long-span suspension bridges, has been recently proposed and numerically studied by the authors. In this paper, the bearing performance of the CBPCA foundation under different working loads is further investigated by performing a series of 1-g model tests. Taking into consideration the traditional caisson foundation (CA foundation) and the CBPCA foundations with different pile diameters (i.e., d = 20 mm, 30 mm), pile spacing (i.e., S = 3.5 d, 4.5 d, 5.5 d) and pile lengths (i.e., l = 270 mm, 360 mm, 450 mm), seven working conditions were considered. The horizontal displacement, vertical displacement, earth pressures on the front surface and the bottom of caisson, as well as the induced bending moments in the piles, were analyzed to illustrate the bearing capacity of the CBPCA foundation. The test results show that compared to traditional CA foundation, the CBPCA foundation is feasible for long-span suspension bridges considering its smaller displacements and inclination angles under certain circumstances (i.e., pile diameter d ≥ 20 mm, pile length l ≥ 450 mm, and pile spacing S ≤ 4.5 d). Moreover, the bending moments in piles of different locations were also discussed, and the corner pile and edge pile located under the front caisson subject to the greatest bending moment.

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Data availability

Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China [Grant Numbers 51778575, 52078457] and the Science and Technology Plan Project of Department of Transportation of Zhejiang Province [Grant Number 2020050].

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Authors and Affiliations

  1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou, 310058, People’s Republic of China

    Xiaoqing Zhao & Xiaonan Gong

  2. China North Industries Norengeon Ltd, Shijiazhuang, 050043, People’s Republic of China

    Yongle Duan

  3. College of Civil Engineering, Hefei University of Technology, Hefei, 230009, People’s Republic of China

    Panpan Guo

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  1. Xiaoqing Zhao
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Correspondence to Panpan Guo.

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Zhao, X., Gong, X., Duan, Y. et al. Load-bearing performance of caisson-bored pile composite anchorage foundation for long-span suspension bridge: 1-g model tests. Acta Geotech. 18, 3743–3763 (2023). https://doi.org/10.1007/s11440-023-01808-5

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