飞机荷载引起隧道地表沉降数值模拟研究

为研究飞机起飞对隧道施工过程中地表沉降的影响，依托某机场隧道工程实例，利用MIDAS GTS NX软件进行数值模拟，分析了飞机荷载对单线隧道和双线隧道地表沉降的影响规律。研究结果表明，飞机由单线隧道左侧滑行至右侧时，地表沉降最大值由左侧移至中间偏右位置，且最大值不断增大。飞机滑行经过双线隧道工程上方时，地表沉降最大值由先行隧道上方逐渐转移至后行隧道上方；当飞机经过两隧道中间滑行至后行隧道拱肩上方时，地表沉降值最大且超过30 mm。单线隧道和双线隧道的最大沉降均位于拱顶位置处，向周围方向沉降值逐渐减小，因此，在施工过程中，除了应定时进行监测外，需重点关注拱顶处沉降情况，保证施工安全。

Numerical simulation study on tunnel surface subsidence caused by aircraft load

This study investigated the impact of aircraft take-off on the surface subsidence during the construction of an airport tunnel project with the numerical simulation. The change rule of surface subsidence of single-track tunnel and double-track tunnel caused by the aircraft position under plane load was analyzed through MIDAS GTS NX software. The results demonstrated that, the surface subsidence in a single-track tunnel moved from the left side to the middle of the right side when an aircraft glided from left to right and the maximum value of surface subsidence continued to increase. In the double-track tunnel, the maximum surface subsidence gradually transferred from the top of the first tunnel to the top of the followed tunnel. When the aircraft load was positioned above the arch shoulder of the tunnel behind and passed through the middle of two tunnels, the maximum surface settlement value exceeded 30 mm. The maximum settlements of both single-track and double-track tunnels were located at the vault, with a gradual decrease in settlement value towards the surrounding areas. Those findings suggest that regular monitoring of the construction is essential to ensure the safety during the construction process, especially for the settlement of the vault.