本文提出的隧道断面合理轴线的确定方法,并不涉及繁重的内力计算,而是从合理拱轴的概念出发,以三次样条函数描述并得出断面的合理轴线。它与传统的设计方法所提出的常见断面形式相比较,受力与变形均有明显改善。 The method to determine the reasonable axis of tunnel section proposed in this paper does not involve heavy internal force calculation. Instead, it starts from the concept of rational arch axis and describes the rational axis of the section by cubic spline function. Compared with the common cross-section forms proposed by the traditional design methods, the stress and deformation are obviously improved.