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本文以单颗粒为体系和以固相的拟流体微团为体系分别对泥沙运动进行了受力分析,给出了体系的力平衡方程,并证明了两种方程是相容的,通过对比说明,同一个力采用不同的体系分析时分属于不同类型,例如,流体-颗粒间的作用力在前一体系中属于表面力,在后一种体系中属于彻体力;拟流体分析中的表面力(应力),在单颗粒体系的力平衡中根本不出现等等,由此清楚地表明进行受力分析和建立力平衡方程时明确所研究体系的重要性, 本文还详细分析了对于上述两种体系,颗粒-颗粒碰撞对体系运动所起的作用,以及在运动方程中的体现,并指出:泥沙运动力学中经常使用的“碰撞力”在概念上是含糊的,计算碰撞力的表达式的根据是可疑的,
In this paper, the force analysis of sediment movement is carried out on the basis of single particle system and the quasi-fluid micelle with solid phase respectively. The force balance equation of the system is given and the two equations are proved to be compatible. For example, the force between fluid and particle belongs to the surface force in the former system, and the total force in the latter system. The surface force in the quasi-fluid analysis (Stress), which does not occur at all in the balance of single particle systems, thus clearly demonstrating the importance of specifying the system under consideration when carrying out stress analysis and establishing a force balance equation. In this paper, System, the effect of particle-particle collisions on system motion, and its manifestation in the equation of motion, and points out that the frequently used “collision force” in sediment motion mechanics is conceptually ambiguous and the expression for calculating impact force The basis is suspicious,