叠交山岭隧道施工相互影响及开挖顺序优化研究  

Study on the Interaction and Excavation Sequence Optimization of Overlapping Mountain Tunnels

作　　者：白威龙 BAI Weilong(China Railway 18th Bureau Group Tunnel Engineering Co.,Ltd.,Chongqing 400700,China)

机构地区：[1]中铁十八局集团隧道工程有限公司,重庆400700

出　　处：《国防交通工程与技术》2024年第6期52-57,24,共7页Traffic Engineering and Technology for National Defence

摘　　要：基于三维有限差分模型,分析了叠交山岭隧道开挖相互影响规律,探讨不同开挖方案下叠交山岭隧道穿越段最大位移。研究结果显示:叠交隧道开挖对上穿隧道变形影响比下穿隧道大,下穿隧道开挖导致叠交段上方隧道拱顶沉降增大及拱墙向内的水平位移减小,上穿两隧道开挖导致两隧道中间位置处的下方隧道拱顶沉降以及拱墙水平位移最大。两条隧道上穿下方一条隧道的情况下先开挖下方隧道再分别开挖上方两隧道引起叠交隧道位移最小,对变形控制及施工安全最有利。本文研究成果将为此类山岭隧道叠交穿越工程施工提供指导和参考借鉴。Using a three-dimensional finite difference model,this study analyzes the interaction effects of excavation in overlapping mountain tunnels and examines the maximum displacement in the overlapping section under different excavation schemes.Results indicate that the excavation of overlapping tunnels has a greater impact on the deformation of the upper tunnel compared to the lower tunnel.Excavating the lower tunnel causes increased vault settlement and reduced inward horizontal displacement of the arch wall in the upper tunnel at the overlapping section.Conversely,excavating the two upper tunnels leads to maximum vault settlement and increased inward horizontal displacement in the lower tunnel at the midpoint between the two tunnels.When the two upper tunnels overlap a single lower tunnel,the scheme in which the lower tunnel is excavated first,followed by the sequential excavation of the two upper tunnels,results in the minimum displacement,proving most favorable for deformation control and construction safety.The findings of this study provide valuable guidance and reference for the construction of similar overlapping mountain tunnel projects.

关 键 词：山岭隧道 叠交穿越 相互影响 数值模拟 开挖方案 变形分析 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]