水库大坝坝顶高程计算方法的分析

Analysis of Calculation Method on Dam Crest Elevation

鉴于铁甲水库1999年除险加固阶段及2018年安全鉴定阶段的坝顶高程计算中,在计算控制参数基本相同的情况下计算结果相差过大的问题,先对比了两次坝顶高程计算的洪水标准及特征水位,然后确定两次计算采用的规范公式,最后计算坝顶高程并分析计算结果。结果表明,差值过大是由于规范的更新采用计算公式不同造成的,计算时若多个规范推荐公式符合要求,应进行对比后选用偏安全值作为设计值。该结果为该类型水库土石坝的坝顶高程计算提供了参考。

For the calculation of the dam crest elevation in the reinforcement stage in 1999 and the safety assessment stage in 2018,the difference of the calculation results in Tiejia reservoir is too large when the calculation control parameters are basically the same.In order to find the reason for the large difference between the two calculation results,this paper first compares the flood standard and characteristic water level,then determines the standard formula used in the two calculation,and finally calculates the crest elevation and analyzes the calculation results.It shows that the difference is too large due to the different calculation formulas used in the update of the specification.If the recommended formulas in multiple specifications meet the requirements,the safety value should be selected as the design value after comparison.The result can provide reference for the calculation of earth-rock dam crest elevation of this type of reservoir.