含联络通道地铁区间隧道扩挖形成新建车站施工过程的围岩变形分析
贾向峰高杰古佩胜邹小磊刘贵春李星
Analysis of Surrounding Rock Deformation in the Expansion Excavation Construction Process of Metro Interval Tunnel with Connecting Passage into Forming New Station
JIA XiangfengGAO JieGU PeishengZOU XiaoleiLIU GuichunLI Xing
-
作者信息:中建桥梁有限公司， 402218， 重庆
-
Affiliation:China State Construction Bridge Co., Ltd., 402218, Chongqing, China
-
关键词:
-
Key words:
-
DOI:10.16037/j.1007-869x.2024.04.026
-
中图分类号/CLCN:U456.3+1
-
栏目/Col:研究报告
摘要:
［目的］重庆轨道交通9号线邮轮母港站是将原区间隧道（含联络通道）进行扩挖施工而建成的地铁车站。该工程的地质条件、围岩初始应力场和原区间隧道结构均较为复杂，为确保施工安全，需要对施工过程中区间隧道的复杂力学行为进行分析研究。［方法］在简述该扩挖工程概况的基础上，建立了采用各向异性节理岩体弹塑性模型的三维有限元数值模型，进一步确定了该模型的几何特征、地层特征、结构特征及工序特征。选取了3条测线（联络通道中心线、左线大里程区间隧道中心线、右线小里程区间隧道中心线），分别对这3条测线上方的地面沉降，以及左线隧道、右线隧道的洞周变形进行分析，并将模拟值与实测值进行对比，以研究区间隧道扩挖施工过程中围岩和结构的变形特征。［结果及结论］对模型的模拟结果与施工实测结果进行对比后可认为所建模型具有合理性；联络通道扩挖施工会导致隧道洞周收敛变形明显增大，区间隧道原联络通道位置与施工主通道交汇处的洞周变形最大。应对联络通道内进行渣土回填，以确保隧道扩挖施工的安全、顺利实施。
Abstracts:
［Objective］ The Cruise Home Port Station on Chongqing Rail Transit Line 9 is constructed from in-situ expansion of the existing interval tunnel (including a connecting passage). Due to the complex geological conditions, the initial stress field of surrounding rock, and the structure of the existing interval tunnel, analysis and research of the complex mechanical behavior of the interval tunnel during construction is essential to ensure engineering safety. ［Method］ After outlining the overview of the excavation project, a three-dimensional finite element numerical model, utilizing an anisotropic jointed rock mass elastoplastic model, is established. The model geometric features, geological characteristics, structural features, and procedural characteristics are further determined. Three measurement lines (connecting passage centerline, left-line large-mileage interval tunnel centerline, right-line small-mileage interval tunnel centerline) are selected for analyzing land subsidence above these three lines and deformation around the left-line and right-line tunnels. Simulation values are compared with measured values to study the deformation characteristics of surrounding rock and structure during the construction process of interval tunnel expansion and excavation. ［Result & Conclusion］ The comparison of model-simulated and construction-measured results indicate that the established finite element model is reasonable. The connecting passage expansion and excavation construction leads to a significant increase in convergence deformation around the tunnel, with the maximum deformation occurring at the intersection of the existing connecting passage and the construction main tunnel. Therefore, backfilling with spoil inside the connecting passage is recommended to ensure the safety and smooth implementation of tunnel excavation construction.
过刊浏览
资料下载
友情链接