Abstract Due to the requirement of higher running speeds, large-diameter shield tunnelling is a trend for future urban metro tunnels, and the φ6.98 m large-diameter EPB shield was first used in the construction of Shenzhen Metro line 11. This paper examines the construction difficuilties in Lot 11301 of Shenzhen Metro line 11, such as driving in spheroidal weathered granite, shield attitude control in heterogeneous soft ground and mud caking at the cutterhead due to soft clay, and proposes a specific adaptability design in terms of the main drive configuration, cutting tools, shield body, screw conveyer and muck conditioning system. Furthermore, suggestions are presented for optimization of the large-diameter shield.
Abstract：
Due to the requirement of higher running speeds, large-diameter shield tunnelling is a trend for future urban metro tunnels, and the φ6.98 m large-diameter EPB shield was first used in the construction of Shenzhen Metro line 11. This paper examines the construction difficuilties in Lot 11301 of Shenzhen Metro line 11, such as driving in spheroidal weathered granite, shield attitude control in heterogeneous soft ground and mud caking at the cutterhead due to soft clay, and proposes a specific adaptability design in terms of the main drive configuration, cutting tools, shield body, screw conveyer and muck conditioning system. Furthermore, suggestions are presented for optimization of the large-diameter shield.
2015, Vol. 52 