Abstract:

Yangjiao tunnel in B6 contract section of WulongShuijiang section of ChongqingChangsha expressway is an extralong tunnel with large crosssection. The tunnel has great construction difficulties, great technical complexity and high technical requirements. Double side drift tunneling method is selected on basis of the site conditions and parameter analysis by loadstructure method. Special attention is paid to the monitoring and setting of the preserved deformation volume during tunnel construction. Finally the tunnel crosses the soft ground section successfully and the overall deformation is effectively controlled. The construction technology for Yangjiao tunnel by double side drift tunneling method is presented in the paper, which can provide reference for similar projects in the future.