圆形断面隧洞的水力计算研究

Study on hydraulic calculation of the tunnel with round section

以秦岭隧洞工程水力计算为例,推导了圆形断面的水力要素计算公式,采用数学迭代方法,得到圆形断面正常水深和临界水深的计算公式,并将天然河流划分为若干段,通过能量方程运用excel逐段推求,计算结果表明,水面线类型为缓流,符合水面线定性分析结果。

Taking Qinling tunnel engineering hydraulic calculation as an example, the paper induces the hydraulic element calculation formula of the round section,applies mathematical overlapping algorithm ’ a nd obtains the normal water depth and critical water depth calculation formula of round section. It divides natural river into several sections, applies excel gradual deduction with energy equation. Results show that ： water sur-face curve belongs to slack current, which is in accordance with qualitative analytical results of the water surface curve.