Abstract: The Gongbei Tunnel has a total length of 2,741 meters and is part of the HongKongZhuhaiMacau Bridge Connector Project. The tunnel has a total of six traffic lanes in both directions. The tunnel has the characteristics of large crosssections, shallow embedment, soft soil environment, rich groundwater and the sensitive environment. The construction of this tunnel is the known most complicated geological environment, most difficult in construction and highest technological requirement among all tunnels that under construction in China. Its construction utilizes both cut & cover and partial tunneling methods. The tunneling construction utilizes constructing island first, then cut and cover as well as long distance tunneling, multiple points and curvature jacking methods.

Key words: Underwater Tunnel Jacking, Extra Large Tunnel Cross Section, Cut and Cover of Shallow Tunnels