Volume 8 Issue 4
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Shuai-jie Guo, Fu-hai Zhang, Xu-guo Song, Bao-tian Wang. 2015: Deposited sediment settlement and consolidation mechanisms. Water Science and Engineering, 8(4): 335-344. doi: 10.1016/j.wse.2015.10.002
Citation: Shuai-jie Guo, Fu-hai Zhang, Xu-guo Song, Bao-tian Wang. 2015: Deposited sediment settlement and consolidation mechanisms. Water Science and Engineering, 8(4): 335-344. doi: 10.1016/j.wse.2015.10.002
shu

Deposited sediment settlement and consolidation mechanisms

doi: 10.1016/j.wse.2015.10.002

  • a The Third Railway Survey and Design Institute Group Corporation, Tianjin 300251, PR China

  • b School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, PR China

  • c Geotechnical Research Institute, Hohai University, Nanjing 210098, PR China

Funds:  This work was supported by the Fundamental Research Funds for the Central Universities (Grant No. 2009B13514) and the Doctoral Fund of the Ministry of Education of China (Grant No. 20100094110002).
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  • Corresponding author: Shuai-jie Guo
  • Received Date: 2015-05-21
  • Rev Recd Date: 2015-10-05
    Abstract
  • In order to study deposited sediment settlement and consolidation mechanisms, sediment settlement experiments were conducted using a settlement column. Based on the experimental results, sediment settlement stage definition, excessive pore pressure (EPP) dissipation, and consolidation constitutive equations are discussed. Three stages, including the free settlement, hindered settlement, and self-weight consolidation settlement stages, are defined. The results of this study show that sediment settlement is mainly affected by the initial sediment concentration and initial settlement height, and the interface settlement rate is attenuated linearly with time on bilogarithmic scales during the hindered settlement and self-weight consolidation settlement stages. Moreover, the deposited sediment layer in the self-weight consolidation settlement stage experiences large strains, and the settlement amount in this stage is about 32% to 59% of the initial height of deposited sediment. EPP is nonlinearly distributed in the settlement direction, and consolidation settlement is faster than EPP dissipation in the self-weight consolidation settlement stage. Consolidation constitutive equations for the hydraulic conductivity and effective stress, applicable to large-strain consolidation calculation, were also determined and fitted in the power function form.

     

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