成都平原地区大直径盾构选型研究  

Study on Selection of Large Diameter Shields in the Chengdu Plain

作　　者：齐春 喻渝[1] 王闯 胖涛[1] QI Chun;YU Yu;WANG Chuang;PANG Tao(China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《高速铁路技术》2024年第2期1-9,共9页High Speed Railway Technology

摘　　要：为满足成都平原地区大直径盾构隧道建设需求,本文基于已建紫瑞隧道和锦绣隧道盾构选型经验,依托在建成渝中线铁路蜀安隧道工程,研究了大直径盾构选型问题,给出了盾构机适应性配置建议。研究结果表明:(1)土压平衡和泥水平衡均可适用于成都平原地区大直径盾构隧道修建;(2)当穿越地层以泥岩为主时建议优先选择土压平衡盾构;对于局部存在高水压或强透水地层地段,可辅以地表降水+注浆加固后采用土舱上部注浓泥浆保压掘进土压平衡模式;当泥岩和砂卵石地层长度相当时,建议优先选择泥水平衡盾构或土压-泥水双模盾构;当穿越地层以砂卵石为主时,建议优先选择泥水平衡盾构;(3)城区大直径盾构隧道对地层变形控制要求高,建议盾构机预留同步注双液浆和盾体外注克泥效等惰性浆液功能。To meet the demands of large-diameter shield tunneling in the Chengdu Plain,this paper introduced the experience of selecting the shield for the previously constructed Zirui Tunnel and Jinxiu Tunnel,as well as the performance of shield in the construction of Shu’an Tunnel in Shanghai-Chongqing-Chengdu High-speed Railway(Chongqing-Chengdu Section)under construction,and discussed how to select large-diameter shield,and offer guidance on the adaptable configuration of shield machines.Key conclusions are as follows:(1)Both Earth Pressure Balance(EPB)and Slurry Pressure Balance(SPB)shield technologies are viable for the construction of large-diameter shield tunnels in the Chengdu Plain.(2)When the predominant geology consists of mudstone,EPB shields should be prioritized.For sections with high groundwater pressures or highly permeable strata,a strategy involving surface dewatering coupled with grouting reinforcement,followed by excavation using an upper chamber mud injection with EPB mode under pressure,is recommended.Where mudstone and sandy gravel strata are of comparable length,SPB shields or dual-mode EPB-SPB shields are favored.In cases where sandy gravel formations predominate,SPB shields are the preferred option.(3)In urban areas where large-diameter shield tunneling necessitates stringent control over ground settlement,shield machines should be provisioned with capabilities for synchronous injection of cement-sodium silicate grouts and application of Clayshock and other inert slurries to the exterior of the shield body.

关 键 词：成都平原地区 大直径盾构 泥岩地层 盾构选型 盾构适应性 

分 类 号：U45[建筑科学—桥梁与隧道工程]