Abstract：
The drill and blast method is not a good option for the construction of urban rail transit systems considering its disturbance to residents and environmental impact. Considering the characteristics of urban rail transit and the design and construction of Chongqing Metro Line 6 and Qingdao Metro Line 2, a full study was carried out regarding the control condition of horizontal and vertical sections, overburden depth, TBM passing through station, TBM selection, support structure, and transportation mode as well as risks related to TBM construction. The results showed that: it is possible for urban rail transit to utilize the TBM method with controllable risks; a single-shield TBM should be the main machine used for the urban rail transit construction; segments should be the primary lining; and translation should be taken as far as possible when the TBM passes the station.
2012, Vol. 49 