Abstract:

With the continuous advancement of urban construction, urban construction buildings are becoming increasingly dense. Newly built shield tunnels inevitably underpass existing buildings. Analysis of the influence of shield crossing on the surrounding structure during the whole life cycle is extremely important for the maintenance of existing structures. Based on this, the influence of a crossriver shield tunnel crossing project on the deformation of surrounding oil tank group is analyzed by using the threedimensional finite element method. The research focuses on the deformation of ground oil tank groups under tunnel construction condition, fire and seismic conditions during tunnel operation period. And comparative analysis of the impact on the singletube doublelayer shield and doubletube singlelayer shield tunnel construction plan is carried out.The results show that: (1) During the construction period, the stratum disturbance caused by the doubletube shield is large and wide, so the settlement and inclination rate of the surface oil tank group caused by the doubletube scheme is greater than that of the singletube scheme.(2) When a fire occurs in the tunnel below the tank group,and the doubletube shield is fired at the same time, the deformation of the oil tank group is greater than that of the singletube shield fire, and the deformation of the oil tank group in a fire in a tunnel of the doubletube shield is between the above two. (3) Under the action of earthquake, the seismic response of the ground oil tanks after the construction of tunnel is not much different from that of the unbuilt tunnel condition.

Key words: shield tunnel, oil tank group, underpass, fire disaster, numerical simulation