由于蛋形断面隧洞形式相对比较复杂,正常水深计算需完成较复杂的超越方程求解,通过解析法无法直接获解。常规的图表法,实际应用中不仅依赖图表且存在查图(表)取值的人为误差;试算法由于公式分段且表达形式为非常复杂的超越方程,重复计算工作量大、效率低。依据优化拟合理论,以标准剩余差最小为目标函数,在工程适用参数范围内,经拟合计算获得了由一个通用算式表达、形式简单直观、便于实际应用、计算精度满足设计要求(最大误差为0.729%)的近似公式,具有一定的实用推广意义。
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