Size segregation mechanism of reclamation fill sand due to rainbowing operations in hydraulic dredging activities

doi:10.1016/j.oceaneng.2021.109957

	Size segregation mechanism of reclamation fill sand due to rainbowing operations in hydraulic dredging activities
	Dong, Youkou 2,3; Liu, Chengli 3; Wei, Houzhen 1; Meng, Qingshan 1; Zhou, Haoran 1
刊名	OCEAN ENGINEERING
	2021-12-15
卷号	242 页码:20
关键词	Computational fluid dynamic Discrete element method Coupling analysis Size segregation Hydraulic dredging Rainbowing
ISSN号	0029-8018
DOI	10.1016/j.oceaneng.2021.109957
英文摘要	Segregation of sand grains is often detected in reclamation lands constructed by hydraulic dredging activities using various placement methods, such as bottom dumping, rainbowing, and discharging via floating pipelines. Heterogeneities in the geotechnical characteristics of the reclamation land, such as the relative density, the hydraulic conductivity, and the shear strength, are caused by the size segregation of the dredged materials. In this paper, a computational fluid dynamic (CFD) method and the discrete element method (DEM) are coupled to investigate the mechanism of size segregation of the dredged sands in the deposit process after the rainbowing operations. A numerical water tank is established with an initially uniform flow field. The sand grains are jetted from the nozzle at a given velocity and are then deposited under their self-weight and the drag force from the atmospheric water. The numerical model is validated through a simulation of the settlement of single grains. The main factors that influence the size segregation phenomenon-the flow velocity, the rainbowing velocity, and the water depth-are investigated based on a parametric study. The complex interlayers observed in real reclamation lands are reproduced by considering the construction sequence of the dredged materials.
资助项目	National Natural Science Foundation of China of China[51909248] ; National Natural Science Foundation of China of China[41877260] ; Open Research Fund of State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology[LP2012]
WOS研究方向	Engineering ; Oceanography
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000730210200001
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/30976]
专题	中科院武汉岩土力学所
通讯作者	Zhou, Haoran
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 2.Dalian Univ Technol, State Key Lab Coastal & Offshore Engn, 2 Linggong Rd, Dalian 116024, Peoples R China 3.China Univ Geosci, Coll Marine Sci & Technol, 388 Lumo Rd, Wuhan 430074, Peoples R China
推荐引用方式 GB/T 7714	Dong, Youkou,Liu, Chengli,Wei, Houzhen,et al. Size segregation mechanism of reclamation fill sand due to rainbowing operations in hydraulic dredging activities[J]. OCEAN ENGINEERING,2021,242:20.
APA	Dong, Youkou,Liu, Chengli,Wei, Houzhen,Meng, Qingshan,&Zhou, Haoran.(2021).Size segregation mechanism of reclamation fill sand due to rainbowing operations in hydraulic dredging activities.OCEAN ENGINEERING,242,20.
MLA	Dong, Youkou,et al."Size segregation mechanism of reclamation fill sand due to rainbowing operations in hydraulic dredging activities".OCEAN ENGINEERING 242(2021):20.