一、前言 近年来,我国城市交通状况不断恶化,轨道交通建设正日益频繁地成为各级政府的工作议题,尽管其高昂投资使我们自感经济实力捉襟见肘,但城市交通问题终需解决,否则,将严重制约城市的发展。从世界范围的实 I. Introduction In recent years, the urban traffic conditions in our country have been deteriorating. The construction of rail transit is increasingly becoming a topic of work for governments at all levels. Despite its high investment, which will make us feel stretched by economic strength, the urban transport problem will eventually have to be solved. Otherwise, Will seriously restrict the development of the city. From the world of reality