纵向坡度对粉砂地层盾构隧道施工管片上浮的影响  

Influence of Longitudinal Slope on Floating of Segments of Shield Tunnel Construction in Silty Sand Stratum

作　　者：章勋桁 叶辉贤 谭毅俊 苏栋[2,3,4] 周敏 成浩 ZHANG Xunheng;YE Huixian;TAN Yijun;SU Dong;ZHOU Min;CHENG Hao(Foshan Jianying Development Co.,Ltd.,Foshan 528313,Guangdong,China;College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,Guangdong,China;Key Laboratory for Resilient Infrastructures of Coastal Cities(MOE),Shenzhen University,Shenzhen 518060,Guangdong,China;Shenzhen Key Laboratory of Green,Efficient and Intelligent Construction of Underground Metro Station,Shenzhen 518060,Guangdong,China;Foshan Transportation Science and Technology Co.,Ltd.,Foshan 528315,Guangdong,China)

机构地区：[1]佛山市建盈发展有限公司,广东佛山528313 [2]深圳大学土木与交通工程学院,广东深圳518060 [3]滨海城市韧性基础设施教育部重点实验室(深圳大学),广东深圳518060 [4]深圳市地铁地下车站绿色高效智能建造重点实验室,广东深圳518060 [5]佛山市交通科技有限公司,广东佛山528315

出　　处：《隧道建设（中英文）》2023年第S02期115-121,共7页Tunnel Construction

基　　金：深圳市高等院校稳定支持计划(20220808143139001);国家自然科学基金(52278364);广东省交通运输厅科研项目(2022-QD3-03);深圳大学2035追求卓越研究计划(2022B007)。

摘　　要：V形超大直径盾构隧道在越江隧道中较为常见,有必要针对隧道施工过程中纵向坡度对管片上浮的影响展开研究。依托佛山市季华路西延线工程,建立粉砂地层考虑浆液时变特性的盾构隧道掘进数值分析模型,研究隧道纵向坡度对管片上浮的影响,通过改变推进系统荷载分布施加偏转力矩,分析不同坡度及覆土厚度下偏转力矩与管片上浮的关系。结果表明:1)管片上浮量随掘进环数增加而增加,后面变形趋于平缓。2)在浅覆土条件下,隧道下坡段掘进时管片上浮量最大,水平段次之,上坡段最小;在较深覆土条件下,坡度对管片上浮的影响不大。3)在不同坡度下,正偏转力矩均对管片上浮起抑制作用,且在较深覆土条件下抑制效果较好。V-shaped super-large diameter shield tunnel has been commonly adopted in cross-river projects.It is necessary to study the influence of longitudinal slope on segment floating during tunnel construction.Based on the west extension project of Jihua road in Foshan city,a numerical analysis model of shield tunneling in silty sand strata considering timevarying characteristics of grout is established.The influence of tunnel longitudinal slope on segments floating is studied.The deflection moment is applied by changing the load distribution of propulsion system,and the relationship between deflection moment and segments floating under different slopes and burial depth is analyzed.The results show that:(1)The floating of segments increases with the number of driving rings,and then tends to be stable.(2)For shallow buried tunneling,the floating of segments is the largest in the downslope section,larger in the horizontal section,and the smallest in the upslope section;for deep buried tunneling,the slope has little effect on segment floating.(3)For all longitudinal slopes,the positive deflection moment can inhibit the floating of segment,and the inhibition effect is better for deep buried tunneling.

关 键 词：盾构隧道 粉砂地层 纵向坡度 管片上浮 掘进环数 偏转力矩 

分 类 号：U45[建筑科学—桥梁与隧道工程]