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| Research on the Parameters of Pre-lining Support in Loess Tunnel |
| SUN Bing |
| (China Railway First Survey & Design Institute Group Co. Ltd. Xi′an, Shaanxi 710043， China) |
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Abstract Abstract：Research purposes： With the development of transportation, it is urgent to deal with the problem of the mechanized construction of tunnels in soft surrounding rock. In this paper, the integral safety of pre-lining was analyzed based on project of Hongliangying large section loess tunnel by numerical simulation method. The support parameters could be analyzed based on above results, and the research results can give reference for design and construction of similar projects in future. Research conclusions：（1）The distance of steel frame had significant effect on the integral safety of pre- lining, the smaller the distance was, the higher the safety factors were.（2）The different treatment methods of the arch foot had greater effect on the integral safety of pre-lining.（3）Because the cutting groove is segmented, the safety factor of the pre- lining is reduced. When the local weakening degree of the pre-lining was more than 50%, the safety factor of the pre-lining can’t satisfied safety requirements.（4）In this paper, by taking the project of Hongliangying large section loess tunnel as the research background, the integral safety of pre-lining was obtained in different conditions of buried depth, distance of steel frame, treatment methods of the arch foot and local weakening degree. The results can give guiding role for design and construction of pre-cutting method tunnels in future.
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Received: 13 July 2017
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2017, Vol. 34 
