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Performance of Deep Braced Excavation Under Embankment Surcharge Load

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Abstract

This paper reports a typical case history of deep braced excavation for constructing the main bridge cushion cap of the Yangwan River Bridge to explore the excavation performance under embankment surcharge load. Three-dimensional finite difference analysis, simulating the whole construction process of this case history, was performed to capture the effects of the embankment–excavation distance, revel level, and excavation bottom sealing on the responses of the earth retaining structure and the ground. It was found that both the ground surface settlement and the retaining structure deformation are larger on the near-embankment side than the far-embankment side. The responses on the near-embankment side are more sensitive to the embankment–excavation distance and the river level. However, the effects of these parameters diminish greatly when the embankment–excavation distance exceeds 1.5 times the excavation depth. The excavation bottom sealing measures can reduce the retaining structure deformation, and effectively restrain basal heave. This restraint weakens as the excavation bottom sealing thickness exceeds 1 m.

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Acknowledgements

This research work was funded by the National Natural Science Foundation of China (51774107, 42077249), the Opening Project of State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology (KFJJ21-03Z, KFJJ23-05M, KFJJ23-04M).

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Authors and Affiliations

  1. School of Civil Engineering, Hefei University of Technology, Hefei, 230009, China

    Yixian Wang, Jiye Ouyang, Panpan Guo & Xian Li

  2. State Key Laboratory of Explosive Science and Technology, Beijing Institute of Technology, Beijing, 100081, China

    Yan Liu

  3. School of Resources and Safety Engineering, Central South University, Changsha, 410083, China

    Hang Lin

  4. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou, 310058, China

    Xiaonan Gong

  5. Anhui Road & Bridge Engineering Group Co., LTD., Hefei, 230031, China

    Jian Li

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  1. Yixian Wang
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  2. Jiye Ouyang
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  4. Yan Liu
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  5. Hang Lin
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  6. Xian Li
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Correspondence to Panpan Guo.

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Wang, Y., Ouyang, J., Guo, P. et al. Performance of Deep Braced Excavation Under Embankment Surcharge Load. Geotech Geol Eng 41, 3575–3586 (2023). https://doi.org/10.1007/s10706-023-02474-w

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  • DOI: https://doi.org/10.1007/s10706-023-02474-w

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