Static batch settling behaviors of dredged and filled sediment and its steady-state macroscopic evaluation criteria

BAO Shufeng; DONG Zhiliang; MO Haihong; ZHOU Ruibo; ZHANG Jinwen

doi:10.11779/CJGE20221361

Volume 46 Issue 3

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Chinese Journal of Geotechnical Engineering > 2024 > 46(3): 549-557. > DOI: 10.11779/CJGE20221361

BAO Shufeng, DONG Zhiliang, MO Haihong, ZHOU Ruibo, ZHANG Jinwen. Static batch settling behaviors of dredged and filled sediment and its steady-state macroscopic evaluation criteria[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(3): 549-557. DOI: 10.11779/CJGE20221361

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Static batch settling behaviors of dredged and filled sediment and its steady-state macroscopic evaluation criteria

BAO Shufeng^{1, 2,},
DONG Zhiliang^{3, 4},
MO Haihong⁵,
ZHOU Ruibo⁶,
ZHANG Jinwen^{1, 2, ,}

1.
School of Civil & Engineering Management, Guangzhou Jiaotong University /Guangzhou Maritime University, Guangzhou 510725, China
2.
Guangdong Provincial Key Laboratory of Green Construction and Intelligent Operation & Maintenance for Offshore Infrastructure, Guangzhou 510725, China
3.
CCCC Fourth Harbor Engineering Institute Co., Ltd., Guangzhou 510230, China
4.
CCCC Key Lab of Environmental Protection & Safety in Foundation Engineering of Transportation, Guangzhou 510230, China
5.
School of Civil Engineering & Transportation, South China University of Technology, Guangzhou 510641, China
6.
CCCC FHEC Harbor Engineering Design Co., Ltd., Guangzhou 510220, China

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Received Date: November 03, 2022
Available Online: March 14, 2024

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Abstract

Abstract

The static batch settling behaviors and mechanism of dredged and filled sediment and its steady-state macroscopic evaluation criteria have not been studied in depth yet. This is one of the main reasons why the optimal start-up time cannot be scientifically judged when the dredged and filled sediment foundations are treated by the vacuum filtration drainage consolidation technology today. In view of this, a theoretical study on the static batch settling behaviors of the dredged and filled sediment is conducted, and the theoretical relationship between the settling velocity of particle suspension and the average pore ratio is established. Based on the dredged and filled sediment from typical engineering sites and the configured typical concentration specimens, the experimental researches on the static batch settling model are carried out. The results indicate that: (1) The content of clay particles (d < 0.005 mm) is one of key factors affecting the static batch settling behaviors and mechanism of the dredged and filled sediment. (2) The maximum particle flux Gmax often occurs at very low concentrations that are difficult to measure experimentally. The higher the viscous content, the more difficult it is to measure experimentally the maximum particle flux during static batch settlement. (3) For the dredged sediment whose clay content is within 40% to 60%, the cumulative change rate of the average porosity ratio of 60% to 75% can be taken as the criterion for evaluating the steady state of its batch settling process.
- dredged and filled sediment,
- static intermittent settlement behavior,
- steady-state evaluation criterion

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References (17)

References

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