首都国际机场线下穿机场高速公路变形特性研究

Deformation characteristics of Beijing International Airport Line underground crossing the airport expressway

首都国际机场线浅埋暗挖法隧道下穿机场高速公路为重大风险工程,工程施工过程中必须保证北京交通主干道—机场高速公路的安全运行,为此进行了第三方监测工作。通过隧道下穿期间机场高速公路和北皋匝道桥的监测,总结了监测断面的变形特征和监测测点随时间的变化情况。实际监测过程中发现了数条路面、路基裂缝和多处地面冒浆,及时的信息反馈为工程控制措施的采取提供了依据。监测结果表明,机场高速公路受施工影响出现了较大的变形,但安全运行未受影响,第三方监测发挥了积极的安全保障作用。变形特性的研究成果可为类似浅埋暗挖法隧道下穿城市重要交通干道工程提供借鉴性资料。

The construction project of Beijing International Airport Line is with high risk as its shallowburied tunnel underground crossing the airport expressway. Strict third-party monitoring survey is conducted to keep the Beijing Traffic Trunk Road-airport expressway operating safely. The deformation results and characteristics of the airport expressway and Beigao ramp bridge are introduced. During the period of monitoring, many pavement cracks, roadbed cracks and some moil from underground are found. The timely information from monitoring surveying helps to take engineering control measures immediately. The result shows that the expressway has endured of large deformation, but kept in safety operation. The third-party monitoring measurement has played an active role in the project. The achievements may give a good reference to other projects.