湿陷性黄土地区大断面隧道施工控制

Construction Control of Flood Cross-section Tunnel in Collapsible Loess Area

近年,我国高速铁路客运专线施工迅速发展,高速铁路的行车时速达到300 km/h,这也对铁路线下施工提出更为严格的要求。郑西铁路客运专线是国内第一条修建在湿陷性黄土地区的铁路客运专线。对铁路黄土隧道施工过程控制进行简述,特别针对湿陷性黄土隧道洞内采用桩基处理软土地基,地表偏压进行卸载处理,隧道施工中围岩监控量测的应用等问题通过实例进行分析。可为其他类似工程施工提供参考。

In recent years, the construction of high speed railway for passenger traffic is developing rapidly. The travelling speed for high speed railway reaches 300 km/h, which needs a stricter standard for construction of railway lines. Zhengzhou-Xi＇an high speed railway for passenger traffic is the first railway built on collapsible loess area. This paper briefly introduces the construction control of tunnels on loess area. Aiming at tunnels on collapsible loess area, pile foundation is adopted for soft foundation inside the tunnel. Unbalanced soil pressure is addressed by unloading. And supervision and measure of surrounding rock in tunnel construction is also analyzed through actual examples. The research results are of some referential value for similar projects.