1现状 轨道交通系统是城市公共客运交通网络中的骨干,是解决大城市客运交通问题的根本途径。从1863年英国伦敦修建了世界上第一条地铁开始,至今全世界已有40多个国家100多座城市建成轨道交通工程,我国的轨道交通建设正逐步得到发展。 轨道交通是规模巨大、土建机电复杂的综合性系统工程,建设投资大、周期长。我国不少大城市已将建设轨道交通提上议事日程,北京、上海、广州等城市已建成了100多公里的轨道交通,但居高不下的工程造 1 The status quo Rail transit system is the backbone of urban public passenger transport network, is to solve the basic urban passenger transport problems. Since 1863, the first subway in the world was constructed in London, England, more than 100 cities in over 40 countries have completed rail transit projects in the world so far. The construction of rail transit in our country is gradually being developed. Rail transit is a large-scale, civil electrical and mechanical complex integrated systems engineering, construction investment, long cycle. Many major cities in our country have put the construction of rail transit on the agenda, and Beijing, Shanghai, Guangzhou and other cities have completed more than 100 km of rail transportation, but the high construction