青草沙过江管隧道盾构水中进洞技术

青草沙过江管隧道工程长距离穿越长江江底后在长兴岛工作井进洞,盾构进洞时覆土达到33m,且存在长兴岛地质复杂、承压水水头高等问题,盾构进洞存在较大风险。该文叙述了盾构水中进洞的施工工艺,并针对青草沙过江管隧道的特点,提出进洞施工时应注意的问题。

Technique of Shield Tunneling into Shaft in Water for Qingcaosha Crossing-river Pipe Tunnel

Qingcaosha Crossing-river Pipe Tunnel Project tunnels into the working shaft of Changxing Island after crossing the bed of Changjiang River by a long distance.The cover soil is 33 m when the shield tunnels into the shaft,and the geology of Changxing Island is complicated,the artesian head is high.There is the larger risk for the shield tunneling into the shaft.The article describes the construction technology of the shield tunneling into the shaft in water,and puts forward the issued for attention in the construction of tunneling into shaft according to the characteristics of Qingcaosha Crossing-river Pipe Tunnel.