Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Grain Incipient Motion Considering Randomness of Grain Location
Incipient motion of solid grain in solid-liquid two-phase flow is often concerned in Geotechnical Engineering, such as soil piping, contact scouring, and flowing soil. The random deposit location, grain size, seepage forces, fluid velocity, and the structure of grains on the surface of passage causes the randomness of the incipient motion of solid grains. A random variable of dimensionless exposure was introduced to denote the location randomness. The probability of the variable distribution was counted as uniform. In consideration of buoyant weight, hydrodynamic pressure, hydrostatic pressure, friction shearing force, uplift force, cohesive force of grains, and the relationship among force arm, force balance and exposure, a calculation model for critical velocity of solid grain was established by means of moment equilibrium analysis. Integrating the critical velocity equation and submergence probability distribution equation, a quantitative relationship between the critical velocity and the incipient motion velocity of grains was built, which offers a practical formula for calculation of the critical velocity under certain incipient motion criterion.
Grain Incipient Motion Considering Randomness of Grain Location
Incipient motion of solid grain in solid-liquid two-phase flow is often concerned in Geotechnical Engineering, such as soil piping, contact scouring, and flowing soil. The random deposit location, grain size, seepage forces, fluid velocity, and the structure of grains on the surface of passage causes the randomness of the incipient motion of solid grains. A random variable of dimensionless exposure was introduced to denote the location randomness. The probability of the variable distribution was counted as uniform. In consideration of buoyant weight, hydrodynamic pressure, hydrostatic pressure, friction shearing force, uplift force, cohesive force of grains, and the relationship among force arm, force balance and exposure, a calculation model for critical velocity of solid grain was established by means of moment equilibrium analysis. Integrating the critical velocity equation and submergence probability distribution equation, a quantitative relationship between the critical velocity and the incipient motion velocity of grains was built, which offers a practical formula for calculation of the critical velocity under certain incipient motion criterion.
Grain Incipient Motion Considering Randomness of Grain Location
Chen, Liang (Autor:in) / Xu, Jiting (Autor:in)
GeoHunan International Conference 2011 ; 2011 ; Hunan, China
16.05.2011
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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