Abstract：The vehicle tunnels adopt box culvert advancing scheme under overlength pipe shed，which is the first case to underpass the west L-taxiway of Beijing Capital International Airport without suspending air service during construction in China. The ground settlement should be strictly controlled. For the case of safety，the numerical simulation of construction has been carried out. The characteristics of ground settlement have been analyzed according to the construction of long pipe shed，excavation of pilot drift and the advancing of box culvert. The simulation result shows that the maximum ground settlement is 24 mm at normal condition. In actual practice，the settlement has been well controlled within 30 mm，which meets the limitation of allowable value. It indicates that the simulation models and results are effective and rational；and the box culvert advancing scheme under overlength pipe shed is feasible.
