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在城市轨道交通线网规划实践中,对于中心城区面积较大、各方向规划较均衡的城市,在规划放射线达到一定数量时需研究规划环线的必要性。分析了城市轨道交通环线的概念、功能定位、规划条件、运营组织;以宁波轨道交通5号线为例,从线网形态、城市布局、线路功能、城市发展、客流及运营组织等角度,详细论述了新一轮规划中将该线由U形线改为环线的可行性及必要性。
In the planning of urban rail transit network planning, it is necessary to study the planned circular route when the planned radiation reaches a certain amount for cities with large urban area and more balanced planning in all directions. This paper analyzes the concept, function orientation, planning conditions and operation organization of the urban rail transit loop. Taking Ningbo Metro Line 5 as an example, this paper analyzes the characteristics of the urban rail transit loop in details, such as the shape of the network, the layout of the city, the function of the city, urban development, passenger flow and operation organization Discusses the feasibility and necessity of changing the line from U-shaped line to circular line in the new round of planning.