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为了合理地确定迂回线坚曲线半径的取值，研究了凸形及凹形两个断面的不同情况下还回线竖曲线半径的取值方法，并针对各种不同情况，在进行详细的公式推导后，分析得出每一种大型车辆在不同的坡度差下，能安全通过迂回线所需要的最小竖曲线半径。
In order to reasonably determine the value of the radius of the camber line, the method of taking the radius of the camber line in two different sections of convex and concave is studied. For different situations, After derivation, the minimum vertical curve radius required for each large vehicle to safely pass the detour line is obtained for each large vehicle under different gradient differences.