Abstract: Construction methods for a rectangular shielding tunnel are: Developing Parallel Link Excavating (DPLEX) Shield, Wagging Cutter Shield (WCS), MultiMicro Shield Tunneling (MMST) Method and Simultaneous Shielding and Concreting for large cross section rectangular tunnels. Compared with the circular cross section tunnels, the rectangular tunnels have the advantages of having shallow embedment depth, high space utilization ratio, and more cost effective. This paper presents a case history of the design and construction aspects of Guangfu Road under cross tunnel. Both circular and rectangular tunnel shielding methods are compared. The advantage as well as disadvantage aspects in the rectangular design and construction are also discussed in the paper.

Key words: Rectangular Tunnels, Shielded Tunnels, Construction Technique, Construction Procedures