·98·
近年来,在城市地铁建设中出现了越来越多的新建隧道
近接既有线施工的情况,近接施工时,由于时间先后关系、
空间位置关系及施工方法不同会导致一系列力学行为的变化,
因此,如何保证既有线的安全运营以及新建隧道的安全施工
具有十分重要的理论意义和工程应用价值。
隧道近接施工对既有线影响的现有研究方法,有数值模
拟法、解析法以及现场检测3种,其中以数值模拟法为主。有
文献通过有限元软件模拟,分析了盾构施工对既有线应力和
衬砌变形的影响。江华等采用有限元数值模拟和现场自动化
监测相结合的方法,对深圳地铁盾构隧道近接上跨既有线引
起的结构变形进行了研究。杨宇恒等应用数值模拟方法,对
先下后上穿越次序下,穿越施工对既有隧道及周边环境的扰
动进行了预测分析。刘树佳等针对上海地铁 11号线上下穿既
有 4号线的多线叠加复杂工况,建立了三维弹塑性有限元模型,
研究了不同净距、不同土压力、不同注浆量下新建隧道对既
有线管片变形的影响。万飞等依据深圳拟建新彩隧道近接上
跨 2条隧道叠置的工程实例,应用有限元软件进行三维数值模
型分析,对比分析明挖暗挖法和暗挖法新建隧道时对既有线
变形及内力的变化规律。卢岱岳等研究了盾构隧道近接施工
对既有隧道纵向变形的影响。方晓慧对交叉、并行、交叠隧
道 3种不同工况进行三维静力数值模拟,得到了既有隧道变形
和结构内力的变化规律。
上述已有研究集中于不同施工方法、不同施工力学参数、
不同近接上跨工况下新建隧道对既有线的影响方面,暂未从
盾构隧道左右线施工顺序角度考虑新建隧道对近接上跨既有
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[中图分类号] U 231.1 b b b b b [文献标志码] A b b b b b [文章编号] 1001–523X(2021)19–0098–05
Influence of Shield Tunnel Construction Sequence on Deformation
of Overpass Existing Railway tunnels
Li Gang-zhu
[Abstract ]Aiming at the adjacent construction problem of a newly built metro tunnel crossing obliquely over a double-deck four-
line overlapping tunnel formed by an existing metro tunnel in a certain area, the influence of different construction schemes on the
deformation of the existing line in the left and right sides of the newly built tunnel is studied by means of numerical simulation based on
finite difference method. The results show that: 1 ) the left side is constructed firstly and the right side is constructed secondly.In the
case,the left line of the newly built tunnel passes through the overlap of the four lines to the overlap of the new right line and reaches
the overlap of the four lines. The vertical displacement of the arch top and the arch bottom of the left line of the existing line varies
greatly ,respectively ,655.22% and 920.04%. 2 )In the construction scheme of left first and right then ,the right line of the newly
built tunnel passes through the overlap of the four lines to the end of construction ,and the right line of the existing line.The variation
range of vertical displacement at the top and bottom of the arch is 174.46% and 191.45% respectively. 3)In the construction scheme of
right firstly and left then,the righ
盾构隧道施工顺序对上跨既有隧道变形影响(论文).pdf