大埋深盾构隧道下穿施工对既有铁路的影响分析

吴石松; 于淼; 卢永刚

doi:10.20265/j.cnki.issn.1007-2993.2024-0210

大埋深盾构隧道下穿施工对既有铁路的影响分析

doi: 10.20265/j.cnki.issn.1007-2993.2024-0210

中铁武汉勘察设计院有限公司，湖北武汉　430074

详细信息

作者简介:
吴石松，男，1981年生，大学本科，高级工程师，主要从事岩土工程监测及相关研究工作。E-mail：25018678@qq.com

通讯作者:
于　淼，女，1989年生，工学博士，高级工程师，主要从事岩土工程勘察设计及相关研究工作。E-mail：yumiao_cc@163.com

中图分类号: U455
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出版历程
- 收稿日期: 2024-05-16
- 修回日期: 2024-11-15
- 录用日期: 2025-01-02
- 刊出日期: 2025-10-10

Influence of deep-buried shield tunneling construction undercrossing existing railways

China Railway Wuhan Survey and Design & Institute Co., Ltd., Wuhan 430074, Hubei, China

摘要

摘要: 城市综合交通建设进程中，新建公路或地铁线路盾构隧道下穿既有铁路的交叉工程日益增多。以往研究采用数值模拟和现场监测等手段分析了盾构对铁路变形的影响规律，盾构隧道埋深一般不超过20 m。由于隧道施工时空效应，超过20 m埋深隧道下穿施工对铁路变形特征的影响尚不清晰。以武汉市某公路盾构隧道下穿京广铁路为例，采用自动化监测手段，分析了大埋深盾构隧道下穿施工对既有铁路轨道及路基沉降、接触网倾斜的影响规律。研究发现，针对大埋深盾构隧道下穿施工，铁路路基变形、轨道变形及接触网变形具有一定的滞后性。铁路轨道和路基沉降槽呈V型或U型，影响宽度约为75 m，明显大于普通浅埋盾构隧道。研究成果可为此类深埋盾构下穿工程施工提供数据支撑和参考。
- 大埋深盾构隧道 /
- 下穿施工 /
- 既有铁路 /
- 沉降监测
Abstract: The number of cross-project constructions where new subway lines undercross existing railways using shield tunneling is increasing with the urban comprehensive transportation construction. Previous studies have analyzed the impact of shield tunneling on railway deformation through numerical simulation and on-site monitoring, with tunnel depths generally below 20 m. Due to the time-space effect during tunnel construction, the influence of tunneling at depths exceeding 20 m on railway deformation characteristics remains unclear. This research takes the example of a highway shield tunnel undercrossing the Beijing-Guangzhou Railway in Wuhan city and uses automated monitoring methods to analyze the influence of deep-buried shield tunneling construction on the settlement of existing railway tracks, subgrades, and the inclination of the railway catenary system. The study revealed that for deep-buried shield tunneling construction, the deformations of the railway subgrades, tracks, and overhead contact system have a certain lag. The settlement troughs of the railway tracks and subgrades exhibit a V-shaped or U-shaped pattern, with an affected width of approximately 75 m, which is significantly larger than that of ordinary shallow-buried shield tunnels. The research findings can provide data support and reference for similar deep-buried shield tunneling projects that undercross existing railways.
- deep-buried shield tunnel /
- undercrossing construction /
- existing railway /
- settlement monitoring

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图 1 盾构隧道典型剖面图（单位：m）

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图 2 盾构隧道与铁路平面关系及监测点布置

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图 3 不同阶段铁路轨道累计沉降曲线

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图 4 不同阶段铁路路基累计沉降曲线

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图 5 不同区域铁路路基沉降时程曲线

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图 6 不同区域铁路接触网倾斜时程曲线

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表 1 主要土层物理力学参数

土层	重度 /（kN∙m⁻³）	黏聚力 /kPa	内摩擦角 /（°）	压缩模量 /MPa
（1-4）淤泥	18.6			4.7
（4a）黏土夹碎石土	19.4	57	23	10.3
（5-2-1）红黏土	18.7	46	19	15.1

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表 2 主要岩体力学参数

岩层	承载力 /kPa	压缩模量/MPa
（8a）中等风化灰岩	2500
（8）灰岩	5000
（9-1）中等风化泥质砂岩	1200	46
（9-2）石英砂岩	6000

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表 3 施工监测项目

监测项目	监测点数量/个
路基竖向、水平位移监测	30
轨道竖向、水平位移监测	30
接触网立柱竖向位移、倾斜监测	16

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表 4 施工期既有铁路监测结果

监测项目		监测最大值	所在点位	出现时间（年-月-日）	控制值
轨道变形	竖向位移/mm	−1.97	XXGD05	2022-09-13	−8～+3
	顺铁路方向（Y）水平位移/mm	1.44	SXGD02	2022-09-14	±7
	垂直铁路方向（X）水平位移/mm	1.61	SXGD04	2022-09-14	±7
路基变形	竖向位移/mm	−1.99	XXLJ12	2022-09-14	±10
	顺铁路方向（Y）水平位移/mm	1.82	SXLJ01	2022-09-14	±7
	垂直铁路方向（X）水平位移/mm	−2.34	XXLJ10	2022-09-14	±7
接触网变形	竖向位移/mm	−1.3	JCW108	2022-09-14	±5
	顺铁路方向（Y）倾斜/%	0.16	JCW108	2022-09-14	0.5
	垂直铁路方向（X）倾斜/%	−0.21	JCW108	2022-09-14	0.5

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