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Volume 42 Issue 1
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YE Wei-min, LIU Zhang-rong, CUI Yu-jun, ZHANG Zhao, WANG Qiong, CHEN Yong-gui. Features and modelling of time-evolution curves of swelling pressure of bentonite[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(1): 29-36. DOI: 10.11779/CJGE202001003
Citation: YE Wei-min, LIU Zhang-rong, CUI Yu-jun, ZHANG Zhao, WANG Qiong, CHEN Yong-gui. Features and modelling of time-evolution curves of swelling pressure of bentonite[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(1): 29-36. DOI: 10.11779/CJGE202001003
shu

Features and modelling of time-evolution curves of swelling pressure of bentonite

  • 1.

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

  • 2.

    Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China

  • 3.

    Ecole Nationale des Ponts et Chaussées, Paris 77455, France

  • 4.

    Institute for Advanced Study, Tongji University, Shanghai 200092, China

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  • Received Date: February 14, 2019
  • Available Online: December 07, 2022
    Graphical Abstract
    • Abstract
  • In order to investigate the shape features of time-evolution curves of swelling pressure of bentonite, a series of swelling pressure tests on GMZ bentonite with different initial dry densities are carried out using the constant volume method. The results show that all the obtained time-evolution curves of swelling pressure are characterized by a typical two-peak shape: as the test starts, the swelling pressure increases sharply to a peak value, followed by decreasing to a valley value, after which it increases again to the final value. It is found that the shape of time-evolution curves of swelling pressure is controlled by 6 parameters: the peak, valley and final values of swelling pressure as well as their corresponding hydration times. According to the formation and development mechanisms of swelling pressure, a predictive model for the time-evolution curve with only 5 parameters is proposed. In this model, the swelling pressure is considered as the superposition result of accumulated and dissipated "wedge" pressures, which are assumed to be related to hydration time through an exponential and a Gaussian distribution function, respectively. The proposed model is verified by the experimental results from this paper and literatures, with satisfactory agreements between the measured results and predicted ones.
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    • References (27)
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