泥沙代表粒径对冲刷深度计算结果的影响

Influence of Typical Grain Size of Sediment on Calculation Results of Scouring Depth

泥沙粒径是泥沙运动力学研究中的一个重要物理量,不同的代表粒径对泥沙输移运动的计算结果会产生不同的影响。文章对比了中值粒径和平均粒径的不同,分析了泥沙粒径和均匀性对冲刷深度的影响,结合铁路工程中常用的桥墩局部冲刷计算公式,对比分析了不同代表粒径条件下的冲刷深度计算结果。提出了代表粒径的选用应结合公式制定时所依据基础资料,同时也要考虑泥沙均匀性的影响,提高计算结果的可靠性和精度。

The sediment grain size is an important physical parameter in studying the mechanics of sediment transport; different typical grain sizes will produce different effects to the calculation results of sediment transport. The paper com- pares the differences of medium and mean grain sizes, analyzes the effects of sediment grain size and uniformity on scour- ing depth. The calculation results of scouring depths of different typical grain sizes are analyzed based on the local bridge pier scour calculation formula commonly used in railway projects. To improve the reliability and accuracy of calculation results, both the selection of sediment ~rain size and the sediment uniformitv influence are reauired to be considered.