一、问题的提出随着我国城市化进程的快速推进,交通需求大幅度增加,由此导致的交通拥挤、交通事故增多、环境污染等问题日趋严重。城市轨道交通作为城市可持续发展的有效工具,具有运量大、快速准时、能耗小、污染少、占地少、交通事故少这样一些特点,在缓解城市用地紧张、环境保护、节约能源以及节省人们的出行时间等方面发挥着相当的优 First, the issue raised With the rapid progress of urbanization in our country, a substantial increase in traffic demand, resulting in traffic congestion, increased traffic accidents, environmental pollution and other issues are worsening. As an effective tool for urban sustainable development, urban rail transit has some characteristics such as large capacity, fast punctuality, low energy consumption, less pollution, less land occupation and less traffic accidents. It is of great significance in alleviating urban land use tension, environmental protection, energy conservation and Save people’s travel time and other aspects of playing a very good