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Deformation characteristics and control for foundation pits in floodplain areas of Nanjing, China

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Abstract

A comprehensive understanding of deformation characteristics and control measures for large-scale foundation pits in soft soil regions is of increasing importance to their risk assessment, design, and construction. In this study, the influences of the thickness of soft soil on the deformation of foundation pits are discussed based on statistical data from 24 foundation pits in floodplain areas of Nanjing, China. The mean maximum ground surface settlement around the pit in floodplain areas of Nanjing was 0.38%H, and the maximum ground surface settlement was observed at 0.48H. The maximum influence scope of ground surface settlement was about 3.5H, and the average maximum horizontal displacement of supporting structures was 0.23%H. On this basis, a model of ground surface settlement around the pit according to excavation depth for foundation pits in floodplain areas is derived. In addition, the influence scope around the pit and relevant control measures are proposed for the protection of surrounding underground structures and roads.

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All data, models, and code generated or used during the study appear in the submitted article.

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Funding

The authors are grateful to the National Key R&D Program of China (2020YFC1807200), the National Natural Science Foundation of China (41877231 and 42072299), Colleges and Universities in Jiangsu Province Plans to Graduate Research and Innovation (Grant No. KYCX19-0098), the Scientific Research Foundation of Graduate School of Southeast University (Grant No. YBPY1926), and the Project of Jiangsu Provincial Transportation Engineering Construction Bureau (CX-2019GC02).

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Authors and Affiliations

  1. Institute of Geotechnical Engineering, Southeast University, Nanjing, 211189, Jiangsu, China

    Lulu Liu, Guojun Cai, Songyu Liu & Yan Chen

  2. School of Engineering, University of Warwick, Coventry, CV4 7AL, UK

    Lulu Liu

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  1. Lulu Liu
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  2. Guojun Cai
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  3. Songyu Liu
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Correspondence to Guojun Cai.

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Liu, L., Cai, G., Liu, S. et al. Deformation characteristics and control for foundation pits in floodplain areas of Nanjing, China. Bull Eng Geol Environ 80, 5527–5538 (2021). https://doi.org/10.1007/s10064-021-02264-9

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  • DOI: https://doi.org/10.1007/s10064-021-02264-9

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