Abstract: A finite element model of shieldbored tunnel structure is established, so as to study the influence of water level fluctuation on shieldbored tunnel. The deformation of the tunnel and the ground under different water levels can be predicted and the displacement rules of the shieldbored tunnel under different water levels can be revealed by means of the model.The study results show that: 1) Rebound deformation will occur to the shallow soil layers at the ground surface when the water level rises. The rebound value of ground under which shieldbored tunnel exists is smaller than that of ground under which no shieldbored tunnel exists. 2) Vertical displacement of the tunnel structure and lateral displacement of the sidewall will happen when the ground water level rises from the invert to the crown. The higher the ground water level, the bigger the displacement value. 

Key words: shield, tunnel, ground water, water level fluctuation, influence, study