河南城建学院学报2024，Vol.33Issue(4)：65-71,7.DOI:10.14140/j.cnki.hncjxb.2024.04.009
新建铁路隧道下穿对既有公路隧道的变形影响研究
Deformation impact of newly constructed railway tunnels passing beneath existing highway tunnels
摘要
Abstract
To reveal the deformation impact of newly built railway tunnel excavation beneath an adjacent exist-ing highway tunnel,based on the new Jinyuding tumel project,a three-dimensional numerical model was estab-lished using finite element software to analyze the deformation and stress distribution laws of surface settle-ment,existing tunnel structure deformation,newly built tunnel supporting structure and surrounding rock deformation under excavation disturbance.The results indicate that tunnel excavation beneath an existing tun-nel causes additional deformation of the existing tunnel,primarily in the form of settlement,with the maximum settlement occurring at the tunnel bottom,and the numerical simulation results have a high degree of agreement with field monitoring results.As the excavation progresses step by step,the vertical stress on the horizontal line of the existing tunnel's wall waist always shows a trough-shaped distribution with higher stress at both ends and lower in the middle,and the closer to the tunnel wall,the higher the vertical stress.The longitudinal settlement above the tunnel is characterized by a change from a〝spoon-shaped〝to a〝funnel-shaped〝pattern and even-tually tends to stabilize.Based on the analysis results of the tunnel support structure and the excavation face squeezing deformation,combined with the deformation of the surrounding rock,the development of the plastic zone,and the pattern of stress distribution,the rationality of the tunnel section design and the excavation and support method is demonstrated.关键词
隧道下穿/变形控制/既有隧道/数值模拟/全过程分析Key words
undercrossing tunnel/deformation control/existing tunnel/numerical simulation/whole process a-nalysis分类
交通工程引用本文复制引用
易俊,余尚军,吴晓攀,肖隆晨,钟先海,黄天明..新建铁路隧道下穿对既有公路隧道的变形影响研究[J].河南城建学院学报,2024,33(4):65-71,7.基金项目
国家自然科学基金项目(52208343) （52208343）
