Abstract:

The junction section of Yingpanlu Xiangjiang river crossing tunnel has changing large crosssection, shallow overburden, poor geological conditions and complex stressing conditions. The technologies used for the construction of the fork section of the tunnel, especially the excavation sequence and the secondary lining of the tunnel section with changing large crosssection, are presented in the paper. The practice demonstrates that the technologies adopted are feasible for the specific conditions of the works. 

Key words: Yingpanlu Xiangjiang river crossing tunnel in Changsha, large span section, primary support, secondary lining, monitoring