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Field Study on Rectangular Inclined Deep Foundation Excavation in Soft Soils

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Abstract

Due to the twofold influence of irregular excavation and geometric effect, the deformation mechanism of foundation pits is complicated. To investigate the impact of uneven excavation and geometric differences on the deformation characteristics of deep foundation pits, a long tunnel Phase IV deep foundation pit project in Suzhou is used as a case. Through the field measured data, the special effects of inclined pit bottom and rectangular shape are analyzed, and the deformation characteristics of the pit are summarized, as well as compared against the statistical data. The results indicate that the overall deformation of the pit is small since the pit is in a semi-excavated state. The excavation depth has a significant impact on pit deformation, and irregular excavation will cause the distribution of pit deformation to be skewed towards the deeper side of the excavation depth. As a result of the uneven excavation, the actual working condition of each portion of the foundation trench is inconsistent, causing the unexcavated portion to disturb the excavated portion, resulting in an ongoing process of cumulative deformation. Under the influence of the geometric effect of the rectangular pit, the deformation distribution pattern along the longitudinal section of the pit is parabolic with peaks at the centre and minimal towards the ends. The results of this study can provide a reference for the excavation design of the same type of pit and the study of pit deformation characteristics.

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Data Availability

The data used in the field measurement can be obtained from the corresponding author upon request.

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Acknowledgements

The author(s) wish to express their gratitude to the anonymous reviewers whose constructive comments helped to improve the overall quality of this paper.

Funding

This study is supported by the National Natural Science Foundation of China (No. 42077435, No. 52108328).

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Authors and Affiliations

  1. Department of Civil Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China

    Pingping Rao, Junjie Meng & Jifei Cui

  2. School of Civil and Environmental Engineering, University of Technology Sydney, 15 Broadway, Ultimo, NSW, 2007, Australia

    Sanjay Nimbalkar

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  1. Pingping Rao
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  2. Junjie Meng
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Correspondence to Junjie Meng.

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Rao, P., Meng, J., Cui, J. et al. Field Study on Rectangular Inclined Deep Foundation Excavation in Soft Soils. Geotech Geol Eng 42, 2151–2168 (2024). https://doi.org/10.1007/s10706-023-02666-4

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