Abstract The excavation process of the airport maglev shield tunnel will cause disturbance to the airport runway and underground tubeing, and in severe cases, it will affect the safe operation of the airport and cause significant economic losses. In order to reveal the deformation disturbance effect of the underground tubeing caused by the shield tunnel in the airport maglev curved section, the settlement deformation caused by the shield tunnel in the curved section passing through the underground tubing was studied based on theoretical calculation, numerical simulation and on-site monitoring. The results show that during the tunnel excavation process of the curved section, the lateral settlement trough of the underground tubing will deviate from the central axis of the tunnel. On the inner side of the curved tunnel where the curvature is small, the settlement of the underground tubing is significantly larger than that on the outside of the curved tunnel; the additional thrust t on the shield excavation surface, the shield friction f and the additional grouting pressure g cause the lateral distribution on the subsidence of the underground tubing to be in the shape of "U", and the significant influencing factors are the shield friction and the ground loss; the deformation results of the underground tubing under the three methods are similar, which verifies the theoretical calculation method.
Abstract：
The excavation process of the airport maglev shield tunnel will cause disturbance to the airport runway and underground tubeing, and in severe cases, it will affect the safe operation of the airport and cause significant economic losses. In order to reveal the deformation disturbance effect of the underground tubeing caused by the shield tunnel in the airport maglev curved section, the settlement deformation caused by the shield tunnel in the curved section passing through the underground tubing was studied based on theoretical calculation, numerical simulation and on-site monitoring. The results show that during the tunnel excavation process of the curved section, the lateral settlement trough of the underground tubing will deviate from the central axis of the tunnel. On the inner side of the curved tunnel where the curvature is small, the settlement of the underground tubing is significantly larger than that on the outside of the curved tunnel; the additional thrust t on the shield excavation surface, the shield friction f and the additional grouting pressure g cause the lateral distribution on the subsidence of the underground tubing to be in the shape of "U", and the significant influencing factors are the shield friction and the ground loss; the deformation results of the underground tubing under the three methods are similar, which verifies the theoretical calculation method.
2022, Vol. 59 