摘要
为研究城市轨道交通隧道间近距离穿越工况风险,以青岛地铁6号线峨—富区间盾构隧道上跨既有1号线峨—石区间隧道工程为例,该工程具有超浅埋、上软下硬地层、近距离上跨既有线等工程特点,通过有限元计算分析峨—富区间盾构施工对峨—石区间隧道结构变形影响,提出盾构施工风险管控对策,并在实际施工过程中实时比对计算结果。研究表明:峨—富区间盾构施工过程中,峨—石区间隧道结构变形较小,采取地层预加固、试验段先行、自动化监测综合控制对策,盾构上跨顺利通过,过程中峨—石区间隧道结构各项位移值均为正常,最大位移值约为1 mm,为计算值的1.5倍。此研究成果可为今后类似工程提供参考。
As the scale of urban rail transit networks expands,the number of short-distance tunnel crossings has increased.The shield tunnel for the Qingdao Metro Line 6 E-Fu section crosses the existing Line 1 E-Shi section tunnel,characterized by ultra-shallow burial,soft upper,and hard lower formations,in close proximity to the existing line.The impact of shield construction on the structural deformation of the E-Shi section tunnel was analyzed,and risk control measures for shield construction were studied via finite element analysis(FEA)method.A real-time comparison was conducted during the actual construction process.The results indicated that the structural deformation of the E-Shi section due to the shield construction of the E-Fu section was minimal.Comprehensive control measures,including stratum pre-reinforcement,first test section,and automatic monitoring,ensured a smooth shield crossing.During this process,all displacement values of the E-Shi section tunnel structure remained within the normal range,with the maximum displacement value in the approximate range of 1 mm—1.5 times the calculated value.These findings can serve as a reference for similar future projects.
作者
张强
米保伟
王术明
ZHANG Qiang;MI Baowei;WANG Shuming(AGILETECH Engineering Consultant Co.,Ltd.,Beijing 100050;National Engineering Lab for Green&Safe Construction Technology in Urban Rail Transit,Beijing 100037;Beijing Urban Construction Design&Development Group Co.,Ltd.,Xi'an Branch,Xi'an 710016)
出处
《都市快轨交通》
北大核心
2023年第3期22-28,共7页
Urban Rapid Rail Transit
关键词
城市轨道交通
超浅埋盾构隧道
上软下硬地层
近距离上跨
有限元计算
控制对策
urban rail transit
ultra-shallow buried shield tunnel
soft up and hard down formation
close crossing of the existing line
finite element calculation
control countermeasures
