Comparison and Analysis of the Connection Method of Stacked Underground Tunnel
In the subway stacked tunnel,the force and deformation of the upper and lower tunnels are the core prob-lems of design control,because the lower tunnel bears the load transmitted by the superstructure in the case of deep burial,so it is related to the success or failure of the construction of the stacked tunnel.The traditional stacked tun-nel model cannot consider the joint influence of the deformation of the lower tunnel on the internal force and defor-mation of the upper tunnel during the construction process,and also cannot consider the"blocking effect"of the stiffness,bearing capacity and deformation of the upper tunnel on the lower tunnel.Therefore,in view of the short-comings of the current design methods of stacked tunnels,in order to explore the influence of different connection modes of the upper and lower tunnels on the project,a design model that is closer to reality and can accurately cal-culate the load transmitted by the superstructure of the lower tunnel in the case of deep burial is proposed.Then,the correctness of the method is verified by comparing it with the traditional model curve.The analysis results show that the internal force calculated by the connection model is larger than that of the traditional model,and the calculation results of the traditional model are conservative and unsafe due to the influence of parameter selection.The connec-tion model can reflect the interaction between the rock and the excavation of the upper and lower layers of the tunnel more realistically,so as to simulate the actual stress state of the underground tunnel in the rock formation,and the conclusions obtained have certain guiding significance for the design of the same type of subway stacked tunnel pro-ject,and at the same time solve the limitation of the traditional model to calculate the internal force and deformation of a single tunnel when designing the stacked tunnel,and improve the accuracy of the structural analysis of the stacked tunnel.
stacked tunneldeep burial and excavationnumerical simulationelastic connectionsconnection model
国家科技期刊平台
NSTL
万方数据
维普
