青岛胶州湾海底隧道建造关键技术研究

Key Construction Technology Research of Qingdao Jiaozhou Bay Subsea Tunnel

海底隧道是世界上公认的施工难度大、建设风险高的工程项目,海底隧道安全建造过程中需解决众多关键技术难题。以青岛胶州湾海底隧道为依托,对综合地质勘探技术、不良地质段高效注浆加固技术、自主研发的可维护式防排水技术、综合耐久性控制技术、通风防灾技术等关键建造技术进行研究。勘探探明了工程场区共存在18条断层破碎带,其中海域段14条。注浆堵水效果显著,达堵水率95%、加固体强度15MPa和取芯率80%的标准。应用可维护式防排水设计原则,实现了建成运营后主隧道排水量为0.2m^(3)/(d·m),为设计值的50%。

Subsea tunnels are recognized in the world as difficult and high-risk engineering projects.Many key technical problems need to be solved in the process of safe construction of submarine tunnels.Based on Qingdao Jiaozhou Bay Subsea Tunnel,this paper studies key construction technologies such as comprehensive geological exploration technology,high-efficiency grouting reinforcement technology for unfavorable geological sections,self-developed maintainable water and drainage technology,comprehensive durability control technology,and ventilation and disaster prevention technology.Exploration has proved that there are 18 fault fracture zones in the project site,including 14 fault fracture zones in the sea area.The effect of grouting water blocking is remarkable,reaching the standards of 95%water blocking rate,15MPa solid strength and 80%coring rate.By applying the design principle of maintainable waterproof and drainage,the drainage volume of the main tunnel after completion and operation is 0.2m^(3)/(d·m),which is 50%of the design value.