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Long-term desalination leaching effect on compression/swelling behaviour of Lianyungang marine soft clays

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Abstract

In this study, Lianyungang (LYG) soft marine clays were long-term leached by the distilled water and synthetic NaCl solutions, respectively, and then oedometer tests with cycle loading/unloading were conducted to investigate the desalination leaching effect on its compression/swelling behaviour. Test results reveal that the stress-induced creep generates a void ratio change (Δec), whilst the long-term desalination leaching accompanying colloidal erosion further results in the aging of clays’ structure, and hence, additional void ratio change (Δel) is identified. After long-term desalination leaching process, the compression/swelling behaviour of LYG clays in the elastic loading and unloading stage is changed slightly. However, in the elastoplastic loading stage, the desalination leaching leads to the significant compression at low stress level (less than 200 kPa), followed by the slight difference at high stress level (exceeding 200 kPa). Finally, the compression/swelling behaviour induced by clay’s aging for the long-term desalination leaching process was summarized.

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Funding

This study was supported by the National Natural Science Foundation of China (Grant No. 51878159 and No. 41572280), the Scientific Research Foundation of Southeast University (YBJJ1634), and the Graduate Student Innovation Plan of Jiangsu Province (KYLX16-0240).

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Authors and Affiliations

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

    Zilong Wu & Yongfeng Deng

  2. Institute of Geotechnical Engineering, School of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an, 710054, China

    Zilong Wu

  3. Department of Geotechnical Engineering, Tongji University, Shanghai, 200092, China

    Yonggui Chen

  4. Institute of Geotechnical Engineering, School of Civil and Transportation, Hohai University, Nanjing, 210024, China

    Yufeng Gao

  5. Institute of Geotechnical Engineering, School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China

    Fusheng Zha

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  1. Zilong Wu
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  2. Yongfeng Deng
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  3. Yonggui Chen
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  4. Yufeng Gao
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Corresponding author

Correspondence to Yongfeng Deng.

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Wu, Z., Deng, Y., Chen, Y. et al. Long-term desalination leaching effect on compression/swelling behaviour of Lianyungang marine soft clays. Bull Eng Geol Environ 80, 8099–8107 (2021). https://doi.org/10.1007/s10064-021-02414-z

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  • DOI: https://doi.org/10.1007/s10064-021-02414-z

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