Possibility of Sidewall Collapse of Underground Structures due to Loss of Lateral Support under Internal Blast Loading
For some immersed tube tunnels, the horizontal slab contributes to the structural integrity. If a train running on the slab were subjected to an explosion, which then failed a large area of the horizontal slab, the sidewall might yield under the lateral earth and water pressures. In this study, a three-dimensional Finite Element (FE) model was established to analyze the problem. The dimension and structural characteristics of the model tunnel was taken from a published literature. Three different failure scenarios were analyzed to investigate the risk of side wall collapse.