为应对海域环境土-岩-孤石复合地层超大直径泥水盾构施工存在的重难点及风险,以汕头海湾隧道为工程依托,对泥水盾构的刀盘刀具、冲刷系统、主驱动等进行针对性设计以提高设备适应性,并在孤石处理、刀具配置、掘进参数、施工管理等方面采取针对性施工方案。通过采取以上措施,实现了降低刀具损坏、控制管片上浮、提高施工效率的效果,保障盾构安全、快速通过了不良地质地层。

The tunneling of super-large diameter slurry shield in soil-rock-boulder composite strata in sea area is difficult and risky. Hence, a series of targeted designs are carried out for cutterhead and cutter, brushing system, main drive, etc. of slurry shield used in Shantou Bay Tunnel to improve the equipment adaptability, and a series of targeted treatments are carried out for boulder processing, cutter configuration, tunneling parameter control and construction management. Consequently, the cutterhead wear is reduced, the segement up-floating is control, the construction efficiency is improved, the shield safety is guaranteed, and the section with unfavorable geology is rapidly passed through.