所谓“三心拱”，即拱形由三段相内切的圆弧构成。三段圆弧则有三个圆心，故称三心拱。
文中推导出了任意三心拱和圆弧拱巷道断面积计算的公式。
A fornltila for calculating the heading section of arbitrary three-centered arch and circular arch types was derived in this paper.
介绍了所推导的任意三心拱巷道计算公式，并修正了拱形巷道传统的设计与计算。
A formula derived by the author for calculation of arbitrary three centered arch type headings was introduced here with some modifications made to the conventional design and calculation methods.
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