Abstract:

During the construction of tunnel on Hubei Section of ZhengzhouWanzhou Highspeed Railway, the comprehensive classification and control methods for tunnel face stability are proposed by field monitoring and test, and the advance support and tunnel supporting parameters are improved to solve the problem of tunnel face stability, supporting parameters optimization, mechanized construction method and construction technology. Two construction methods, i.e. fullsection method and microbench method, are adopted in the tunnels on Zhengwan Highspeed Railway; the construction techniques such as highpressure spliting grouting, lowprestressed anchor bolt, overbreak control and highstandard initial shotcrete are discussed and put into practice; and the tunnel face classification management method is established based on construction dynamic management method and informatized project management platform. The successful application of the research results in ZhengzhouWanzhou Highspeed Railway will greatly improve the mechanization level of tunnel construction and provide reference for tunnel mechanized construction.

Key words: ZhengzhouWanzhou Highspeed Railway, large crosssectional tunnel, mechanized construction, classification of tunnel face stability, supporting parameters, construction methods