Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (6): 1784-1794.doi: 10.13278/j.cnki.jjuese.201706201

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Macro-and Meso-Analysis of Newly Formed Highly Viscous Dredger Fill Under Vacuum Preloading Using Particle Flow Theory

Lei Huayang1,2, Wang Tieying1, Zhang Zhipeng1, Lu Haibin1, Liu Min1   

  1. 1. School of Civil Engineering, Tianjin University, Tianjin 300072, China;
    2. Key Laboratory of Coast Civil Structure Safety of Education Ministry, Tianjin University, Tianjin 300072, China
  • Received:2017-03-07 Online:2017-11-26 Published:2017-11-26
  • Supported by:
    Supported by Technology and Sea Projiect of Tianjin (KJXH2013-15)

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Abstract: To analyze the impact of particle composition on reinforcement of dredger fill under vacuum preloading from the aspect of meso-scale mechanism, we carried out a laboratory vacuum preloading model test on one group of samples from Binhai New Area in Tianjin using the particle flow method for simulation; then simulated six groups of samples with different grain size distributions under the same loading condition. The changes of drainage rate and deformation were analyzed. The results show that the two-dimensional particle flow method is effective for the simulation of laboratory vacuum preloading tests. Fine particles penetrated along the migration path with some detained along the way so that the penetration path became narrower and shorter. As for the newly-dredged fill with high clay content under the same loading condition, the initial drainage rate grew faster with the increase of clay content, and decayed faster with the increase of uneven coefficient; while the higher the silt content, the more uniform the porosity of soil at different position, especially, when the silt content was higher than the clay content, and the effecter of vacuum preloading.

Key words: newly-dredged fill, vacuum preloading, particle flow, granulometric composition, clogging, drainage rate

CLC Number: 

  • TU43
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