波流作用下输电线路海中立塔局部冲刷计算方法

Local scour calculation method of power transmission line tower in sea influenced by jointed affect of wave and tide

由于受到波浪和潮流的共同作用,输电线路海中立塔局部冲刷问题较为复杂,比较分析了4种可用于海中塔位局部冲刷计算的公式(韩海骞公式、王汝凯公式、Jones&Sheppard公式和65-1修正式及65-2式)。对于只考虑波浪作用的公式,将波浪水质点平均流速与潮流流速叠加;当考虑潮流往复流作用时,提出采用折减系数法对计算值进行修正。将4种方法分别应用于某输电线路工程海中立塔局部冲刷计算。结果表明,韩海骞公式的计算结果最符合实际。

Influenced by the jointed affect of wave and tide, the local scour problem of power transmission tower in the sea is complicated. 4 local scour calculation formulas （Han Haiqiang Formula, Wang Rukaig Formula, J＆S Formula, 65 - 1 modified formula and 65 -2 formula） applied in the local scour calculation are compared and analyzed. For the formula only considering the wave effect, the velocity of wave particle and the velocity of tidal current are superposed together. For the formula considering the reciprocating flow effect of tide, the reduction coefficient is used to correct the calculated value. The 4 calculation formulas are applied to a tower of power transmission line in sea, and the results show that the Han Haiqian＇s Formula is the most consist- ent with the practical condition.