Abstract: According?to?the?analysis?on?geometry?characteristics?of?the?Lemniscate?curve?and?road?performance,?the?application?of?Lemniscate?curve?in?designing?the?integral?small?circular?road?of?interchange?is?proposed?and?the?feasibility?of?the?usage?of?the?Lemniscate?curve?is?also?testified.?Based?on?the?practical?situation,?the?common?formula?to?oblique?interchange?is?obtained.?For?the?sake?of?convenient?design?and?construction,?the?design?parameter?of?Lemniscate?curve?small?circular?road?is?chosen,?and?the?formula?for?location?of?Lemniscate?curve?is?given.?Finally,?objective?comparisons?are?carried?out?between?the?Lemniscate?curve?and?the?conventional?small?circular?road?from?different?aspects.

Key words: interchange linear , Lemniscate curve , small circular road , integrity

摘要： 通过对双纽曲线几何特征和路用性能的分析,提出把双纽曲线作为整体式立交小环道线型,论证了双纽曲线 整体式小环道的可行性。结合实际情况,推导出了双纽曲线在道路斜交时的通用曲线方程。为了便于施工设计, 选择了一个合理的双纽曲线小环道设计参数,并给出了双纽曲线的敷设定位公式。最后,从不同方面对双纽曲线 整体式小环道与传统的组合式小环道进行了客观的比较。

关键词: 立交线形, 双纽曲线, 小环道, 整体性