曲线路段涵长及洞口斜交角的计算

在涵长基本公式的基础上，详细分析了公式中各参数在曲线路段中的计算方法．分析中发现，涵长与洞口斜交角有关，提出了用迭代法计算洞口斜交角的方法和相关公式．在分析缓和曲线路段涵长计算方法中，给出了路基内外边缘线和涵轴线方程．通过解析法计算了各所需参数，与直线路段相比曲线路段涵长计算工作量较大，宜采用计算机辅助计算．提出的曲线路段涵长公式为电算编程提供了依据．

Calculation of Culvert Length and Skew Angle of Entrance on Curve Road Segment

On the basis of the basic formula for culvert length, the computing method of parameters in the formula on curve road segment is analyzed. The culvert length is relative to skew angle of entrance. The method and formula to the calculation of skew angle of entrance in iteration are proposed. Equations of culvert axis and borderline of outside and inside on roadbed are given. It is found that the computation quantity of culvert length in curve road segment is much more than that of straight line road segment when lots of parameters are calculated by the analysis method. So, calculations aided by computer are fitted and formula of culvert length on curve road segment can give the basis for compile program.