飞机荷载下盾构隧道下穿机场管片及跑道内力响应分析

Analysis on Internal Force Response of Shield Tunneling through Airport Segment and Runway under Aircraft Loading

摘要:

依托广州白云机场下穿隧道工程，分析了下穿隧道施工对飞机跑道的影响以及上方飞机荷载对下穿隧道运行的影响。通过三维有限元数值模拟，分析了最不利情况下即飞机在隧道正上方降落滑行过程中的地层、管片最大位移和管片最大应力结果。研究发现：上覆土层厚度较小的情况下，隧道管片所受拉应力和跑道沉降受飞机荷载影响较大；飞机降落地点越接近隧道正上方，飞机荷载对下穿通道的影响越大，随着降落位置与通道轴线距离的增大，管片拉应力、地层和跑道沉降先增大后减小，降落位置位于左线隧道正上方时达到最大值。

Abstract:

Relying on the Guangzhou Baiyun Airport Underpass Tunnel Project, the impact of the underpass tunnel construction on the aircraft runway and the impact of aircraft loading above on the operation of the underpass tunnel are analyzed. Three?dimensional finite element simulation is used to analyze the results of the strata, the maximum displacement of the segments and the maximum stress of the segments during the most unfavorable situation, namely the landing and taxiing process of the aircraft directly above the tunnel. The results show that when the thickness of the overburden soil layer is relatively small, the tensile stress on the tunnel segments and the runway settlement are greatly affected by the aircraft load. The closer the landing site of the aircraft is to directly above the tunnel, the greater the impact of the aircraft load on the underpass. With the increase of the distance between the landing position and the channel axis, the tensile stress of the segment, the settlement of the stratum and the runway first increase and then decrease, reaching the maximum value when the landing position is directly above the left line tunnel.