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A case study of vacuum tube-well dewatering technology for improving deep soft soil in Yangtze River floodplain

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Abstract

Deep soft soil of the Yangtze River floodplain in Nanjing has a special interlayer structure, which provides favorable conditions for the application of vacuum tube-well dewatering technology. This paper focuses on the design, construction and treatment effect of vacuum tube-well dewatering technology. The hydrological parameters and the hydraulic connections between the various layers of the site have been ascertained through two simple single-well multi-holes pumping tests. Moreover, the layout of vacuum tube wells and depressurization wells in a test site with 84 m length and 84 m width was designed based on the above parameters. Field tests of vacuum tube-well dewatering technology were conducted on the test site. And the changes in groundwater level, ground settlement and pore water pressure during the test was monitored. The CPTU test technology was used to quickly evaluate the engineering properties of the site before and after treatment. Finally, combined with the settlement monitoring data, the hyperbolic method was used to predict the final settlement. The results indicated that the consolidation efficiency of vacuum tube-well dewatering technology has obvious advantages. Implications of this study can provide a reference for the construction design of the site's ground improvement consolidation and other similar projects.

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Acknowledgements

Many Thanks to Professor Guangyin Du for his suggestions to the analysis and discussion of this paper. Great thanks also go to the editorial board and the reviewers of this paper.

Funding

This study was financially supported by the National Natural Science Foundation of China (51878158) and the Science and Technology Guidance Project of Jiangu Housing and Urban–Rural Development Department in China (2020ZD001203).

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Authors and Affiliations

  1. School of Transportation, Southeast University, Nanjing, 211189, Jiangsu Province, China

    Biao Zeng, Dingwen Zhang, Zejia Gong & Songyu Liu

  2. National Demonstration Center for Experimental Road and Traffic Engineering Education (Southeast University), Nanjing, 211189, Jiangsu Province, China

    Biao Zeng & Dingwen Zhang

  3. Nanjing Darcy Geotechnical Engineering Co., Ltd, Nanjing, 210041, Jiangsu Province, China

    Yu Zhen

  4. China Tiesiju Civil Engineering Group Co., Ltd, Hefei, 230022, Anhui Province, China

    Tao Meng

Authors
  1. Biao Zeng
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  2. Yu Zhen
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  3. Dingwen Zhang
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  4. Tao Meng
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  5. Zejia Gong
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  6. Songyu Liu
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Correspondence to Dingwen Zhang.

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Zeng, B., Zhen, Y., Zhang, D. et al. A case study of vacuum tube-well dewatering technology for improving deep soft soil in Yangtze River floodplain. Environ Earth Sci 80, 598 (2021). https://doi.org/10.1007/s12665-021-09878-y

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  • DOI: https://doi.org/10.1007/s12665-021-09878-y

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