An overview of research on metro tunnel lining in the sub-rectangular shape

Abstract

Circular tunnels are the most popular shapes used in urban underground transportation systems when mechanized tunneling is used for tunnel excavation. However, circular tunnels have a small space utilization ratio. With the material development, non - circular tunnels such as sub - rectangular, U - shaped lining, etc. are now common, and their cross - section helps to improve the underground space utilization. However, there have been not many studies on the structure and the calculation method of the metro tunnels with the above cross - sections. The paper uses the analytical synthesis method to find out the advantages and disadvantages, the application conditions of the sub - rectangular shape, as well as the development direction for the complete calculation methods for this cross - section in Vietnamese conditions.

Influence of Interior Column on the Behaviour of Quasi-Rectangular Tunnel

“…The sub-rectangular tunnel is described in the studies by Huang et al (2018), Do et al (2020), Dang et al (2021) and Nguyen et al (2021). The assembled tunnel lining is made up of 6 segments (B, L, and F block).…”