【摘要】 通过自行设计试验装置,完成不同粒径原型沙在不同渗透力下的泥沙起动流速试验。结果表明:随着渗透力的增大,起动流速有下降趋势;在相同的渗透力下,粒径越大,泥沙起动流速下降的绝对值幅度越大;其原理是渗透力使泥沙颗粒产生部分失重,导致泥沙的等效密度下降,最终使泥沙起动流速下降。为渗透力起动泥沙在水流拖曳力作用下高效输送泥沙提供了可靠的试验数据和理论依据。更多还原

【Abstract】 The experiments on incipient velocity of different-sized prototype sand under different penetration of sediment were completed by a self-designed test equipment.The results show that as the penetration increases,the incipient velocity show a decreasing tendency.Under the same penetration,the larger the particle diameter is,the more is the amplitude of the absolute value of incipient velocity decreasing.The principle is that some of the sediment particles in weightlessness would lead to the decrescence of the equivalent density of the sand under penetration,and finally result in the decrescence of the incipient velocity.The research could provide both reliable experiment data and theoretical references for starting sediment and effectively transporting sediment under the water drag by penetration.更多还原