Incipient flow velocity of non-uniform sediment particles by considering the additional mass force

doi:10.1016/j.oceaneng.2021.109705

	Incipient flow velocity of non-uniform sediment particles by considering the additional mass force
	Wu, J.1,2; Sun, M. H.1; Zhang, L. W.1,2; Zhang, X. Y.1
刊名	OCEAN ENGINEERING
	2021-10-15
卷号	238 页码:9
关键词	Non-uniform sediments Additional mass force Relative exposure degree Incipient flow velocity
ISSN号	0029-8018
DOI	10.1016/j.oceaneng.2021.109705
英文摘要	The sediments on the natural seabed are generally non-uniform particles. The incipient motion of non-uniform sediment particles has always been a key problem in the ocean engineering. In this paper, the incipient flow velocity of non-uniform sediment particles by considering the additional mass force is studied by means of mechanical analysis and comparative verification. Firstly, the mechanical model of non-uniform sediment particles is established in consideration of the seepage force, cohesion and the additional mass force caused by nonuniformity. Combined with the randomness of the position of non-uniform particles on the bed surface and the relative exposure degree of non-uniform particles, a systematic and comprehensive formula of the additional mass force is proposed. The mechanical equilibrium equations of critical incipient motion of the non-uniform sediment particles are established, and the critical incipient flow velocity of sediment particles under sliding instability and rolling instability are derived. Then, the accuracy and validity of the proposed formulas are verified by comparison with the results of flume test, field measurement and other formulas. Finally, the influence factors of the incipient flow velocity of non-uniform sediment particles are analyzed, and the change laws of influence factors are obtained. The results show that: 1) The incipient motion form of sediments on the natural seabed is generally the rolling instability. 2) The incipient flow velocity of sediment particles decreases first and then increases with particle diameter. 3) The incipient flow velocity of sediment particles increases with the dry bulk density. 4) The incipient flow velocity of sediment particles decreases with the increase of hydraulic gradient and relative exposure degree.
资助项目	Na-tional Natural Science Foundation of China[42007234] ; Na-tional Natural Science Foundation of China[41977222] ; Natural Science Foundation of Shandong Province[ZR2020QE263] ; Open Research Fund of State Key Labo-ratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences[Z019009] ; Open Research Fund of State Key Labo-ratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences[Z020023]
WOS研究方向	Engineering ; Oceanography
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000696704100004
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/27925]
专题	中科院武汉岩土力学所
通讯作者	Wu, J.; Zhang, L. W.
作者单位	1.Shandong Univ, Inst Marine Sci & Technol, Qingdao 266237, Shandong, Peoples R China 2.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Wu, J.,Sun, M. H.,Zhang, L. W.,et al. Incipient flow velocity of non-uniform sediment particles by considering the additional mass force[J]. OCEAN ENGINEERING,2021,238:9.
APA	Wu, J.,Sun, M. H.,Zhang, L. W.,&Zhang, X. Y..(2021).Incipient flow velocity of non-uniform sediment particles by considering the additional mass force.OCEAN ENGINEERING,238,9.
MLA	Wu, J.,et al."Incipient flow velocity of non-uniform sediment particles by considering the additional mass force".OCEAN ENGINEERING 238(2021):9.