Safety Analysis Of The Cross-river Tunnel With Shield Method

With the establishment of the urban underground rail transportation and the improvementof the subway transportation network, more and more cross-river tunnel come out in big citieslike shanghai, Wuhan, Guangzhou and Nanjing. There are many project risks such as drivingspewing caused by drilling or bed crack, tunnel segment float caused by bottom river-watersupplement, deformation even crack caused by river levee settlement, knife exchange in theriver water, connected aisle.Combined with the example of the cross-river tunnel in Guangzhou subway project andby referring to a lot of information and data from field monitoring, this paper studied theproject risk with the numerical method to guide the engineering practice. The constructionscheme, protection measure and emergency project of the cross-river tunnel construction areobtained. The prime work is as follows.Risk analysis of the cross-river tunnel shield project was made. According to referring tothe engineering project example and literature both at home and abroad, this paper analyzedthe construction risk and emergency hidden trouble of the cross-river tunnel shield project toguide the compliment of the construction scheme and protection measures.The feasibility drilling proposal is presented according to the actual engineeringgeological conditions.Simulation analysis and feasibility report of drilling through river levee with shieldmethod is made.