摘要
以国内首个水下超大直径盾构主隧道机械法联络通道工程——海珠湾隧道区间6#联络通道工程为例,首先分析不同类型特殊衬砌管片在超大直径盾构主隧道机械法联络通道施工过程中的适用性,然后采用动力显式有限元法建立考虑刀盘切削及材料损伤破坏的精细化模型,研究内覆钢板特殊衬砌管片在联络通道机械法施工过程中的受力特性。研究结果表明:机械法施工过程中超大直径盾构主隧道发生椭变,切削破洞后洞口两侧呈明显压应力集中现象,且受刀盘切削顶进影响,较大的变形增量及环间错台量均集中在洞口两侧;采用内覆钢板特殊衬砌管片,洞口侧结构在切削过程中的应力集中现象明显减弱,开口侧变形减小0.5~1.5 mm,结构更安全;施工前将特殊衬砌内覆钢板焊接为一体有利于增强管片之间整体性,可将主隧道环间错台变形限制在较小水平。
In this paper,the 6#cross passage of Haizhu Bay Tunnel,the first mechanically built cross passage of a superlarge-diameter shield main tunnel in China,is used as the example.First,the suitability of different types of specially lined segments in construction of mechanically built cross passage of a superlarge-diameter shield main tunnel is analyzed.Then the dynamic explicit finite element method is used to create a fine model that takes into ac⁃count cutterhead cutting and material damage failure,so as to investigate the stress characteristics of inlaid steel plate specially lined segment during construction of mechanically built cross passage.As the results indicate:In the mechanical construction process,the superlarge-diameter main tunnel experiences elliptical deformation.After cut⁃ting of the opening,both sides of the opening exhibit noticeable compressive stress concentration.Under the effect of the advancing cutterhead,major deformation increment and inter-ring dislocation are concentrated at the two sides of the opening.When inlaid steel plate specially lined segment is installed,the stress concentration of the structure at the sides of the hole in the cutting process is obviously abated,the deformation at the opening side is decreased by 0.5~1.5 mm,and the structure is made safer.Before construction,the inlaid steel plate of the special lining is welded into the whole structure,to enhance the integrity of the segments and to keep the inter-ring dislocation deformation of main tunnel at a low value.
作者
郑镇跡
黄书华
陈湘生
张良
刘皓铭
盛健
苏栋
ZHENG Zhenji;HUANG Shuhua;CHEN Xiangsheng;ZHANG Liang;LIU Haoming;SHENG Jian;SU Dong(College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060;China Railway 14th Bureau Group Mega Shield Construction Engineering Co.,Ltd.,Nanjing 210000)
出处
《现代隧道技术》
CSCD
北大核心
2024年第1期117-124,共8页
Modern Tunnelling Technology
基金
深圳市高等院校稳定支持计划(20220808143139001)
国家自然科学基金(51938008)
深圳大学2035追求卓越研究计划(2022B007).
关键词
超大直径盾构隧道
联络通道
机械法
特殊衬砌管片
结构力学响应
Superlarge-diameter shield tunnel
Cross passage
Mechanical method
Specially lined segment
Struc⁃turalmechanical response
