闸坝下游局部冲刷计算方法的对比分析

Comparative analysis on calculation methods for local scour at downstream part of gate dam

闸坝下游的局部冲刷是威胁水电站安全的主要因素之一。本文首先将现有的冲刷公式分7类进行归纳总结,根据各家公式的理论依据、分析方法、经验数据来源不同,对各家公式进行了量纲和谐分析和各自的适用情况分析;其次,推导出了一种基于剪切应力下闸坝下游局部冲刷深度的计算公式。为了验证该公式的适用性,选取了其他工程的冲刷资料进行验证。结果表明,计算公式的计算值与实测值吻合较好。

The local scour at the downstream of the gate dam is one of the main factors threatening the safety of the power station.Firstly,the existing scouring formulas are summarized into seven categories in the paper,the dimensional harmony of the formulas is analyzed and respective application is analyzed according to the difference in theoretical basis,analysis methods and experience data sources of each formula.Secondly,a depth calculation formula of local scour of gate dam downstream based on shear stress is derived.The scouring data of other projects are selected for verification in order to verify the applicability of the formula.The results showed that the calculated results of the calculation formula is well matched with the measured results.