海底复杂地层超大直径盾构刀盘设计与优化  

Design and Optimization for Cutterhead of an Extra-large Diameter Slurry Shield Boring in Submarine Complex Strata

作　　者：孔少波 KONG Shaobo(Shantou Su-Ai Tunnel Construction Investment and Development Co.,Ltd.,Shantou 515000,Guangdong,China)

机构地区：[1]汕头市苏埃通道建设投资发展有限公司,广东汕头515000

出　　处：《隧道建设（中英文）》2019年第6期1030-1037,共8页Tunnel Construction

基　　金：汕头市苏埃通道工程科研课题(SAKT-003)

摘　　要：为解决海底复杂地层超大直径盾构刀盘设计中面临的刀间距布置、刀盘结构分析、刀盘功能优化等难题,基于某海湾隧道工程地质、水文特点,对盾构穿越海域段全断面软土层、孤石侵入的软土地层、基岩突起地层等工况开展分析。首先,开展室内不同刀间距破岩实验确定中心区域间距并提出刀盘刀具的总体布置方案;其次,采用数值计算对刀盘结构进行静力学和模态分析,结构的最大应力为190 MPa,最大变形为6.2 mm,前6阶频率为26.6~ 42.9 Hz,固有频率避开了工作频率;最后,考虑工程特点进行集中控制分布式冲刷系统、刀具运行状态监测及耐磨保护措施的刀盘功能优化。工程应用表明,刀盘结构强度、刚度满足要求,刀间距设计合理,刀盘优化措施提升了盾构在淤泥及海底软硬不均地层的适应性,可为类似海底复杂地层盾构选型及设计提供一定的参考。The issues such as cutter spacing arrangement, cutterhead structure analysis and cutterhead function optimization in the design of super-large diameter shield cutterhead boring in submarine complex strata are very important. Hence, the working conditions of a shield bay tunnel crossing full-face soft strata, soft strata intruded by boulders and bedrock protruding strata are analyzed in detail based on geological and hydrological conditions of the project. Firstly, the indoor rock breaking tests with different cutter spacings are carried out to determine the cutter spacing in the central area, and the general layout scheme of the cutterhead is proposed. And then the static and modal analysis of the cutterhead structure are carried out by numerical calculation, and the results show that the maximum structural stress reaches 190 MPa, the maximum deformation reaches 6. 2 mm, the first six natural frequencies range from 26. 6 Hz to 42. 9 Hz, and the natural frequencies avoid the working frequencies. Finally, the cutterhead optimization methods, i. e. centralized control and distributed scouring system, cutter running condition monitoring and wear-resistant protection measures are put forward. The application results show that the cutter spacing is rational, the cutterhead structure can meet the requirements of strength and stiffness, and the cutterhead optimization methods can improve the adaptability of shield in silt and hard and soft strata. The results can provide reference for shield design and selection in similar projects in the future.

关 键 词：盾构 刀盘 刀间距 静力学 模态分析 状态监测 

分 类 号：U45[建筑科学—桥梁与隧道工程]