隧道竖井施工对地下管线影响的数值模拟 隧道竖井施工对地下管线影响的数值模拟
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隧道竖井施工对地下管线影响的数值模拟·
方
华¨
李国成
丁烈云
李小青
吴贤国
骆汉宾
(华中科技大学,武汉430074)
摘要:研究目的:研究武汉长江隧道施工对地下管线的影响,对于确保工程的安全实施至关重要。建立江北竖
井地下连续墙、土体与地下管线变形耦合作用的三维有限元分析模型,分析不同开挖步骤、不同管材、不同地
下管线埋深、离基坑的不同距离、不同管径、壁厚对地下管线位移的影响。
研究结论:以武汉长江隧道江北竖井施工为例,通过建立计算模型和对不同开挖步骤、不同管材、不同管
径、不同地F管线埋深、离基坑不同距离的分析,管线位移随开挖深度增加而增大,头两步开挖对管线位移的
影响起决定性作用,在前二步开挖时要严密监测施工对管线的影响;由于受到地下连续墙的抑制作用,地下管
线存在着端部效应问题,离基坑越近,其端部效应越明显,端都效应改变了管线的位移形态;管线外径和壁厚
对其位移的影响不显著;多种管线并存时,其相互影响不显著。
关键词:士力学;深开挖;数值模拟;有限元法;地下管线
中图分类号:U4贷.3+9
文献标识码:A
Numerical Simulation for the Efiect of Tunnel Shaft Construction
on
Buried
Pipelines
‘
FANG Hua,LI Guo—cheng,DING Lie—yun,LI Xiao—qing,、vU Xian—guo,LUO Han—bin
(Huazhong University of Science&Technology,Wuhan,Hubei 430074,China)
Abstract:Research purposes:Investigating the effect of Wuhan Yangzte River tunnel construction
on buried pipelines
is very important to ensure
the construction safety.3一D FEM is applied to model the deformational coupling effect for
the north side shaft diaphragm,surrounding soil and buried pipelines.Construction effect
on
pipe deformation is
analyzed in terms of excavation steps,pipe material,buried depth,distance to pit,pipe diameter and wall thickness of
pipe.
Research conclusions:Take the north side shaft construction of Wuhan Yangzte River tunnel for example,this paper
analyzes the construction effect in terms of excavation steps,pipe material,buried depth,distance to pit,pipe diameter
and wall thickness of pipe.The result indicates that the pipeline displacement increases
as
excavation
depth.The
magnitude of the displacement is mainly determined by the first two excavation stages.The first two excavation stages
should be strictly monitored;for the sake of diaphragm wall,end—effect exists
on
the pipeline.End—effect becomes
distinct
as
close to the pit.And the displacement mode
is changed for the sake of end—effect;outer diameter and
thickness of pipeline has no distinct effect
Oil pipeline displacement;multiple types of pipelines have
no distinct effect on
each other when they exist together.
Key words:soil mechanics;deep
excavation;numerical simulation;finite element method(FEM);buried pipeline
随着城市建设的迅猛发展,充分开发利用地下空
间已成为我国城市现代化发展的必然选择。地下工程