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何建林

 

 

(沪杭铁路客运专线股份有限公司，上海 200040)

摘要：随着城市地下空间的不断开发，新建隧道不可避免的近距离穿越既有地下结构。为此，依托苏州东大直径盾构隧道下穿轨道交通5号线工程背景，通过有限元软件建立三维数值模型模拟盾构下穿施工过程，分析了盾构掘进对既有地铁隧道和地表的变形影响。结合现场实测，探讨了隧道掘进不同阶段引起周边环境变形的原因，并提出了针对性的变形控制措施。结果表明：隧道掘进主要引起斜交范围内既有隧道的变形，既有隧道和地表最大竖向位移分别为5.15 mm和4.472 mm，均小于工程要求的10 mm限值；盾构通过后引起的地表沉降和隧道沉降占比高达42.6%和40.0%，而后期固结稳定阶段的地表沉降和隧道沉降占比仅为2.5%和6.6%。研究成果可为类似工程提供一定的借鉴和指导。

关键词：大直径盾构；近距离下穿；数值模拟；变形影响

中图分类号：U45

文献标志码：A

文章编号：1005-8249（2025）06-0060-06

DOI：10.19860/j.cnki.issn1005-8249.2025-06-011

 

 

 

HE Jianlin

 

 

(Shanghai Hangzhou Railway Passenger Dedicated Line Co.,Ltd.,Shanghai200040)

 

Abstract：With the continuous development of urban underground space,new tunnels inevitably pass through existing underground structures at close range.To this end,based on the background of the Suzhou East Large Diameter Shield Tunnel Underpass Rail Transit Line 5 project,a three-dimensional numerical model was established through finite element software to simulate the shield tunneling construction process,and the deformation effects of shield tunneling on existing subway tunnels and ground surfaces were analyzed.Based on on-site measurements,the causes of deformation in the surrounding environment during different stages of tunnel excavation were explored,and targeted deformation control measures were proposed.The results indicate that tunnel excavation mainly causes deformation of existing tunnels within the oblique intersection range,with maximum vertical displacements of 5.15 mm and 4.472 mm for existing tunnels and the ground surface,respectively,both of which are less than the engineering requirement of 10 mm limit;The proportion of surface settlement and tunnel settlement caused by shield tunneling is as high as 42.6% and 40.0%,respectively,while the proportion of surface settlement and tunnel settlement during the later consolidation and stabilization stage is only 2.5% and 6.6%,respectively.This study can provide some reference and guidance for similar projects.

 

Key words：large-diameter shield tunneling machine;wearing at close range;numerical simulation;deformation impact

 

 

基金项目：国家重点研发计划(2023YFC3806702)。

作者简介：何建林(1983—)，男，本科，高级工程师，研究方向:铁路工程。

收稿日期：2025-09-22