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依托成绵乐客运专线机场路隧道下穿成都市蓝天立交工程,采用有限差分软件FLAC~(3D)进行三维数值模拟分析。主要从隧道开挖所造成的地表沉降、桩基下沉量以及桩基端部水平位移差值这三个方面进行研究。研究结果表明:暗挖施工方案明显优于明挖施工方案。研究成果为既有立交桥的正常运营以及机场路隧道施工的顺利进行提供了保证,又可为相似工程提供参考。
Relying on Chengdu-Mianle Passenger Dedicated Airport Road tunnel under the blue sky overpass project in Chengdu, the use of finite difference software FLAC ~ (3D) for three-dimensional numerical simulation. Mainly from the tunnel excavation caused by the surface subsidence, pile sinking and pile end of the horizontal displacement of the difference between the three aspects of research. The result shows that the construction plan of undercutting is obviously better than the plan of open excavation. The research results provide a guarantee for the normal operation of both overpasses and the smooth progress of airport road tunnel construction, and provide reference for similar projects.