Abstract:

Taking the construction of Changsha Tunnel on No.6 Line of Guangzhou Metro as an example, the authors simulate the construction procedure of bench method excavated tunnel by means of 3D numerical simulation. Then, the authors comparatively analyze the effect of temporary invert and the influence of the construction of the right tube on the right tube and the ground surface settlement and present the trend of ground surface settlement, stressing, displacement and plastic zone in right tube constructing. The analysis results demonstrate the function of the temporary invert and the adverse influence of adjacent tunnel construction on the ground surface settlement and the former excavated tunnel. This paper can help the determination of construction scheme.

Key words:  , shallowburied tunneladjacent constructionground surface subsidencedisplacementplastic zone