双坡阶段渐变率控制分析

The Analysis of Gradual Change Ratio in the Double Way Gradient Stage

在目前公路设计中,当双坡阶段的超高渐变率小于1/330时,设计者需要对其进行调整.本文通过分析提出,是否需要对双坡阶段进行调整,不取决于超高渐变率,而应取决于由原纵坡和超高渐变率组合而成的综合坡度.从而提出了一个新的概念:综合纵坡.并通过设计案例进一步分析总结了何种情况下综合纵坡不满足要求以及相应调整方案.

In the current highway design,when the gradual change ratio of the double slop phase is less than 1 /330,designers need to make some adjustment. Through anaylsis,this artical points out that whether it is necessary to carry on the adjustment to the double slope phase does not depend on the gradual change ratio,but should depend on the comprehensive grade by the original longitudinal slope grade and the gradual change ratio combination. Then it puts forward a new concept： comprehensive longitudinal slope grade. And at last through the design case the article further analyzes and summarizes the circumstances under which a comprehensive longitudinal slope does not meet the requirements and the corresponding adjustment scheme.