这是目前在施的世界上最大隧道工程之一,工程目的是解决芝加哥市长期以来的污水和暴雨突袭成灾的问题,工程量有穿经白云岩开凿的隧道,长211公里,深45～91米,直径2.7～10.8米。还有252座直径1.2～5.1米的截水竖井,645项接近地表的聚水构筑物,4座泵站和5个蓄水量共为1.55亿方的蓄水 This is one of the largest tunnel projects in the world currently under construction in Shih. The purpose of the project is to solve the long-standing problem of sewage and catastrophic rainstorms in the city of Chicago. The amount of work is through tunnels drilled through the Dolomites, which is 211 kilometers long and 45 to 45 meters deep. 91 meters in diameter 2.7 to 10.8 meters. There are 252 intercepting shafts 1.2 to 5.1 meters in diameter, 645 close-to-surface polywater structures, 4 pumping stations and 5 water storages totaling 155 million cubic meters