The metro tunnel across the ground fissure belt in Xi′an is selected as the engineering background in this article.First

the models of the interaction amoung metro tunnel

ground fissure and stratum for different types of tunnel lining are established using ABAQUS.Then the subway moving loads are applied on each finite element model and the vibration responses of each system are simulated.Finally

the basic vibration characteristics of soil near the ground fissure and the influence of tunnel section size and shape on vibration response are analyzed.The results indicate that the vibration of the soil near the vibration source is mainly high-frequency vibration

while the vibration on the ground far away from the vibration source is mainly low-frequency vibration.As for the sectional horseshoe-shaped tunnel in ground fissure area

the vertical ground acceleration responses near the ground fissure are greater than that at other areas.The ground vibration can be weakened by increasing the tunnel section size.In this simulation condition

tunnel section shape has a certain effect on the ground vibration in the range of 12 metres away from the tunnel center line and it has no significant effect on the ground vibration outside this range.As for the displacement responses

horseshoe cross section and rectangular cross section are almost the same

while circular cross section varies a lot from both horseshoe cross section and rectangular cross section.There are vertical dislocations between the hanging wall and footwall at the ground fissure under the subway moving loads

their numeric values are related to the distance from the tunnel lining.