Abstract:In view of the key nodes of the super-large section tunnel of the transit expressway link project in Shenzhen, the stress-strain relationship after the excavation of the surrounding rock of the tunnel is analyzed by means of numerical simulation, and a new method of load calculation is proposed. According to the geology of the project, the design method, key points and problems that should be paid attention to in the design of tunnel structure are discussed. The calculation results show that the method of judging the load of loose arch by strain index is a more reliable method for calculating the load of large section. The construction method for excavation of multiple pilot tunnels is safer, and the deformation of surrounding rock is also controllable. This design method can provide reference for the design of such structure.
