基于功能定位和速度效率的市域快线速度目标确定

为指导市域快线的规划设计以引导市域快线健康有序发展，分析轨道交通的分层体系以及各分层的相互关系和所处的位置，并对容易混淆的地铁、市域快线、市郊铁路、城际铁路等制式进行技术参数的详细对比分析。明确市域快线的属性及适用范围，特别是市域快线位于市区的线路和市区外围的线路应具有不同的功能定位及技术特征。确定市域快线速度目标值选择应考虑的因素和步骤，首次提出速度效率的概念，且市域快线应根据速度效率和站间距、旅行速度的关系来选择速度目标值，并明确了市域快线最高运行速度与站间距、速度效率、旅行速度之间的制约关系，市域快线要提高旅行速度应提高速度效率，而不仅仅是最高速度。

Urban Rail Rapid Transit Speed Target Selection Based onFunction Positioning and Speed Efficiency

To guide the planning and design of urban rail rapid transit and to lead in the healthy and orderly development of urban rail rapid transit, the hierarchical system of rail transportation and the relationships between and locations of the hierarchical groups are analyzed. The technical parameters pertaining to subway, urban rail rapid transit, commuter rail, and intercity rail, which are easy to confuse, are analyzed and compared. The properties and scope of application of urban rail rapid transit are defined, especially routes of urban rail rapid transit in city centers and outside cities, which should have different function orientations and technical characteristics. The factors considered and the steps used in the speed selection of urban rail rapid transit are established, and the concept of speed efficiency for urban rail rapid transit is proposed for the first time. The highest operating speed of urban rail rapid transit should be chosen according to the relationship between the speed efficiency, average station spacing, and travel speed. Furthermore, the relationships between the maximum speed of urban rail rapid transit and the average station spacing, speed efficiency, and travel speed are defined. Thus, optimizing urban rail rapid transit should increase speed efficiency, not merely achieve the highest speed.