铁道标准设计2025，Vol.69Issue(5)：142-150,9.DOI:10.13238/j.issn.1004-2954.202306240001
铁路隧道下穿致大跨箱形通道裂损施工对策研究
Study on Construction Countermeasures for Cracking in Large-Span Box Culvert Caused by Railway Tunnel Underpass
摘要
Abstract
This study aims to address the engineering challenges of significant cracking and deformation in the large-span box culvert caused by the underpass construction of railway tunnels.Taking the actual project of cracking and noticeable deformation in the Hangbin Avenue tunnel caused by the underpass construction of Chongqing East Ring Railway Jiangbei Airport Tunnel as an example,a combination of three-dimensional numerical simulation and on-site monitoring was employed to predict potential risk points in the subsequent construction.For the high-risk columns at C and D axis,temporary reinforcement measures,including steel pipe piers and jacks,were proposed to flexibly control the vertical deformation of the column tops.Additionally,permanent reinforcement solutions were suggested,such as longitudinal alternate removal and replacement of columns and converting individual foundations to strip foundations.The deformation,stress,and differential settlement of the box culvert during construction were examined.The research showed that:(1)the numerical simulation results during the dynamic underpass construction of the tunnel were slightly higher than the actual monitoring data,and the variation patterns of both curves were consistent,indicating that the numerical simulation results were on the safe side and the fitting effect was satisfactory.(2)The frame of the box culvert under temporary steel pipe pier support showed slight increases in deformation and stress during the underpass construction,but the variations stabilized over time.At the same time,the stress on the steel pipe piers gradually increased from an initial 11.6 MPa to 48.7 MPa after the completion of tunnel underpass construction,indicating that the temporary steel pipe piers could effectively share the frame load.(3)From the analysis of structural deformation,structural stress,differential settlement,and other parameters,the safety of the box culvert structure during construction,including the removal of temporary supports and structural repairs,was evaluated.After stabilization,the settlement deformation was 4.9 mm,the differential settlement between adjacent columns was 2.1 mm,the tensile stress was 1.69 MPa,and the compressive stress was 4.37 MPa,all of which met the safety requirements,indicating effective structural repair.(4)After implementing the proposed reinforcement measures,the tunnel underpass task was completed,and the existing box culvert was restored to operation,verifying the effectiveness of the construction countermeasures.关键词
铁路隧道/下穿施工/箱形通道/裂损修复/变形控制/施工对策Key words
railway tunnel/underpass construction/box culvert/crack repair/deformation control/construction countermeasures分类
交通工程引用本文复制引用
郭晓航,龚伦,李涛,刘智,余柠模..铁路隧道下穿致大跨箱形通道裂损施工对策研究[J].铁道标准设计,2025,69(5):142-150,9.基金项目
国家自然科学基金项目(51178399) （51178399）
