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Field study of the effects of composite excavation and combined grouting on the response of large-diameter and superlong rock-socketed bored piles

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Abstract

The excavation method has significant effects on the response of piles, and post-grouting is a great way to improve the response of piles. In this research, field static load tests were performed on three large-diameter and superlong rock-socketed bored piles (LSRBPs) of superhigh-rise constructions. The effects of composite excavation and combined grouting on the response of LSRBPs were studied. The improved effects of combined grouting on LSRBPs that were drilled by composite excavation were discussed. The results indicate that the composite excavation improves construction efficiency but affects shaft-forming quality, thus lowering the bearing capacity of LSRBPs, while combined grouting can contain this defect. Despite reducing the original pile size, combined grouting still significantly improves the bearing capacity of LSRBS and reduces the dispersion of bearing capacity. Existing pile design methods overestimate the bearing capacity of LSRBPs constructed using composite excavation, but underestimate it after combined grouting. The composite excavation forms different pile-rock (soil) interfaces, which affects the effectiveness of combined grouting. The simultaneous application of composite excavation and combined grouting reduces design pile size and improves construction efficiency, thereby achieving the goals of cost reduction and low-carbon construction. The findings have significant implications for the construction and design of LSRBPs.

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Data availability

Raw data were generated at the large-scale pile test. Derived data supporting the findings of this study are available from the corresponding author upon request.

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Acknowledgements

The authors are very grateful to the reviewers for their helpful comments and constructive suggestions in improving this paper.

Funding

This work was supported by the National Natural Science Foundation of China (52008100, 51878160, 52078128), and Natural Science Foundation of Jiangsu Province (BK20200400).

Author contribution’s

Conceptualization was contributed by TH; methodology was contributed by TH; formal analysis and investigation were contributed by BF, TH; writing—original draft preparation, was contributed by TH; writing—review and editing, was contributed by BF; funding acquisition was contributed by GD; resources was contributed by Wg; supervision was contributed by Zw, GD.

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Authors and Affiliations

  1. School of Civil Engineering, Southeast University, Nanjing, 211189, China

    Tao Hu, Guoliang Dai, Zhihui Wan, Weiming Gong & Bowen Fang

  2. College of Transportation Engineering, Nanjing Tech University, Nanjing, 211816, China

    Zhihui Wan

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  1. Tao Hu
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Correspondence to Guoliang Dai or Zhihui Wan.

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Hu, T., Dai, G., Wan, Z. et al. Field study of the effects of composite excavation and combined grouting on the response of large-diameter and superlong rock-socketed bored piles. Acta Geotech. 19, 1853–1871 (2024). https://doi.org/10.1007/s11440-023-02021-0

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