城市轨道交通快线轨道结构选型研究

Research of track structure selection for urban rail transit express lines

根据城市轨道交通快线的运营特征,提出轨道结构选型的基本要求。通过分析比较有砟轨道和无砟轨道、各种类型无砟轨道的结构型式及技术特点,分别对正线、岔区以及车站地段进行轨道结构选型,并对部分车站区间通过数值模拟进行减振降噪一体化设计,得出以下结论:正线大盾构内径区间宜采用板式无砟道床,小盾构内径区间及特殊地段宜采用双块式无砟道床;岔区宜采用钢筋混凝土长岔枕式整体道床;车站范围内宜采用减振降噪一体化轨道结构。相关研究内容可为城市轨道交通快线轨道结构的选型设计提供参考。

According to the operation characteristics of urban rail transit express line, this paper proposes the basic requirements for track structure selection.By analyzing and comparing the structural types and technical characteristics of ballasted tracks and ballastless tracks, and various types of ballastless tracks, the track structure selection for the main line, turnout areas and station sections are carried out, and the integrated vibration and noise reduction designs for some station sections are carried out by numerical simulations, with the following conclusions drawn: The slab ballastless track bed is suitable for the large inner diameter shield section of the main line;double block ballastless track bed is suitable for both the small inner diameter shield section and the special section;reinforced concrete long turnout sleeper monolithic track beds should be used in turnout areas. The integrated track structure which reduces both vibration and noise should be used in the station section of the track. The content of this research can provide guidance for the flexibility in selecting track structures for urban rail transit express lines.