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随着我国高速铁路网的不断发展,以及城市基础设施建
设的不断完善,涉及市政工程下穿高速铁路的立交工程越来
越多。本文以山东地区某实际工程为例,运用MIDAS-GTS有
限元分析软件,模拟排水涵及防护工程施工过程对高铁桥梁
基础产生的影响,通过分析施工影响范围内高铁桥梁 3个方向
的墩顶最大位移,判断排水涵及防护工程方案的合理性,并
对工程施工提出合理化建议,为类似工程提供方案借鉴及合
理的评估方法。
1 工程概况
1.1
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排水涵采用 2 ~4.5 m钢筋混凝土框架涵结构,顶板 0.4 m,
底板0.45 m,边墙 0.3 m,中墙0.3 m,总尺寸为 9.9 m ×3.85 m,
涵身下设20 cm厚C25 混凝土垫层。
排水涵于高铁桥梁第 290~291号孔处下穿,排水涵与高
速铁路夹角为 90°,全长 55.2 m,距离铁路中心线两侧各
25.1 m,采用明挖法直埋施工。施工时采用直径 1.0 m的钻孔
桩以防护既有桥梁基础,钻孔桩净距 20 cm,桩长10 m,基坑
在钻孔桩的防护范围内采用垂直开挖,在钻孔桩的防护范围
外按1 ∶0.5放坡开挖。防护桩范围为以高铁线路中心线向两
侧各偏移 35.1 m,防护范围总长为 70.2 m。
下穿处高铁为双线,线间距 5 m,设计时速350 km/h。排水
涵下穿高铁桥梁处为 40+64+40 m预应力混凝土连续梁,边跨
为40 m。本次以排水涵两侧最近的 3个桥墩作为研究对象,进
行建模分析。排水涵及防护工程与高铁桥梁的相对位置如图 1
所示。
图1 排水涵及防护工程与高速铁路平面布置示意
1.2 )
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本工程排水涵下穿高铁桥梁处,位于山东平原地区。施
[摘 要]
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[中图分类号] U 445.553 ;TU 37 b b b b b [文献标志码] A b b b b b [文章编号] 1001–523X(2020)17–0111–03
Influence of Construction of Drainage Culvert and Protection Engineering on
Adjacent High-speed Railway Bridge
Liu Hua-chen
[Abstract ]With the increasing development of high-speed railways and the continuous improvement of urban infrastructure ,there
are more and more interchange projects under high-speed railway bridges under municipal projects,and the normal operation of high-
speed railway bridges has strict requirements for foundation deformation and track smoothness. Based on the actual engineering case
of a drainage culvert under a high-speed railway bridge,this paper uses MIDAS-GTS finite element software to perform numerical
simulations on the construction stage to calculate the vertical and horizontal deformation of the adjacent high-speed rail bridge foundation
caused by the construction of the drainage culvert and supporting protection engineering ,to judge the implementability of the protection
plan,to provide design experience and evaluation methods for similar projects.
[Keywords ]municipal engineering;underpass high-speed railway ;finite element si
排水涵及防护工程施工对临近高铁桥梁的影响(论文).pdf