研究目的:地铁作为当前和未来大力发展的绿色环保型交通，运营能耗大，尤其牵引用电占城市轨道交通用电量的50%以上。本文通过对“V”型坡、单面坡、长大区间的纵断面进行研究，提出各种工况下的节能型纵断面设计方法，以有效降低地铁运营的牵引能耗，并为地铁纵断面的节能设计提供有益参考。
研究结论:文章从节能坡的研究背景、概念、应用研究等方面进行了深人研究，提出了节能型纵断面的设计方法为:(1)站间距较小的区间应采用合理坡长、坡度的“V"型纵断面:(2)相邻车站高差较大的区间应采用“先缓后陡”的单面坡:(3)站间距较大的长大区间应采用“W”型纵断面:(4)在地铁工程中，尤其是地下敷设方式的线路设计中，可以采用此方法优化纵断面设计，达到线路纵断面节能的目的。
Research purposes: The subway is as the current and future's development direction of green transportation， but the energy consumption of subway is huge and its power consumption is up to the more than 50% of total power consumption of the urban rail transit. In this paper, the research is done on the longitudinal sections of the”V" type slope，single slope and large interval in order to present the design method for the energy-saving vertical section under the various conditions and provide reference to the energy-saving design of subway's vertical section for effectively reducing the energy consumption of subway traction.
Research conclusions: From the deep research on the research's background，concept and application of the energy saving slope，the design methods for the energy-saving profile are presented.(1)The reasonable slope length and slope of”V" type profile should used for the small interval between stations.(2)The single slope with first relief after steep should be used for the interval between adjacent stations with big gap in elevation.(3)The larger”W" type profile should be used for the large between stations.(4)In the underground engineering，especially for the track design with underground laying method， the profile design can be optimized by using this method to achieve the energy- saving purpose of longitudinal section.
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