Approach to Characteristics of Resistance of Hyper-Sediment Concentrated Flow in Sediment Delivery Pipes

The paper obtains the variation laws of hyper-sediment concentrated flow in the sediment delivery pipe and local resistance coefficient and methods for confirmation, puts forward correlation of pipe comprehensive sediment factor and comprehensive resistance coefficient and; points out the influence of fine particle composition to the resistant characteristic of hyper-sediment concentrated flow based on the analysis of observed data. The analysis is shown that the distribution scope of particle size of suspended load gradation is getting wider along with the increase of sediment concentration, the specific density of fine particles in suspended load is getting smaller and the unit volume flow can carry large amount of coarse sand as fine particles increased to a certain level and; it should decide the optimized concentration of fine particles when delivering hyper-sediment concentrated flow for reducing flow resistance and increasing sediment delivery rate.