Abstract：Research purposes:Zhengzhou-Xia' n PassengerDedicated Line is the first long railway line adopting the modified Zueblin slab track with bi-block sleepers on the whole line in China, whereas the slab track requires less subsidence for its foundation. However, for the subsidence of loess tunnels, there is nomature experience for reference athome and abroad and for the assessmentof tunnel foundation subsidence, even no example is available before. This paper attempts to improve the assessmentprocedure and summarize some laws of the tunnel foundation subsidence based on the analysis and study on the tunnel assessment forZhengzhou-Xia' n PassengerDedicated Line.
Research conclusions:The analyses show the total tunnel foundation subsidence is very smal,l most less than 5mm and onlymeasured data from a few of cross sections can offer a reasonable regression curve whilemost of sections can no,t and the tunnel deformation tends to be stable in 60~120 days after finishing the secondary lining.
2009, Vol. 26 
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