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

Wu J.; Sun M. H.; Zhang L. W.Zhang X. Y.

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

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

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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.

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《Ocean engineering》 |2021年第15期|109705.1-109705.9|共9页
作者
Wu J.; Sun M. H.; Zhang L. W.Zhang X. Y.;
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作者单位

Shandong Univ, Inst Marine Sci & Technol, Qingdao 266237, Shandong, Peoples R China|Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China;

Shandong Univ, Inst Marine Sci & Technol, Qingdao 266237, Shandong, Peoples R China;

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正文语种英语
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Non-uniform sediments; Additional mass force; Relative exposure degree; Incipient flow velocity;

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

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