新考塘隧道超大断面施工技术

Xinkaotang Tunnel Super-large Cross Section Construction Technology

在建赣龙铁路新考塘隧道为全线控制性工程,出口段最大开挖宽度30.26 m,最大开挖高度达16.97 m,属超大跨断面,是目前在建的最大铁路施工断面。出口段地质复杂,施工难度大,安全风险高,通过水平旋喷桩和大管棚超前支护、导洞法开挖和全断面拱墙衬砌,最终顺利完成。结合施工实际,阐述超大断面主要的施工方法,供类似工程参考。

Xinkaotang Tunnel on the being-built Ganlong railway as the controlling project, having the maximum excavation in the exit section 30.26 meters in width and 16.97 meters in height, belonging to the super large cross section, is currently the largest construction-section among railways being-buih logical conditions, difficult in construction and high risky in safety. Despite all that, The exit is complex in geo- through churning pile and pipe roofing advance support, pilot drift excavation method and full section is finally completed successfully. Combing with the construction practice, this paper aims to construction method of super large cross section to offer a reference for similar proiects. the horizontal rotary arch wall lining, it introduce the main