路基开挖对下穿隧道结构安全性影响模拟分析  

Simulation Analysis of the Impact of Subgrade Excavation on the Safety of Underpass Tunnel Structure

作　　者：刘治国 Liu Zhiguo(Shanxi Road,Bridge and Tunnel Engineering Co.,Ltd.,Taiyuan 036002,China)

机构地区：[1]山西路桥桥隧工程有限公司,太原市036002

出　　处：《北方交通》2025年第4期73-76,共4页Northern Communications

摘　　要：以某高速公路连接线项目为例,采用FLAC3D软件分析公路路基开挖过程对下穿铁路隧道结构安全性的影响,并论证设计方案的合理性。分析结果表明:路基开挖对于下穿隧道是一个卸荷过程,隧道位移为上升趋势,最大位移发生在左拱腰处;分层、分段施工对下穿铁路隧道结构的位移、应力和运营条件的影响最小,在该工况下开挖,既有隧道结构安全。Taking the project of an expressway connecting line as an example,the impact of highway subgrade excavation process on the safety of the underpass railway tunnel structure is analyzed by using the FLAC3D software,and the rationality of the design scheme is demonstrated.The analysis results show that:subgrade excavation is an unloading process for the underpass tunnel,and the tunnel displacement shows an upward trend,with the maximum displacement occurring at the left arch waist.The layered and segmented construction has the least impact on the displacement,stress,and operating conditions of the underpass railway tunnel structure.Under this kind of working condition,the excavation of the existing tunnel structure is safe.

关 键 词：路基开挖 既有隧道 FLAC3D 数值分析 

分 类 号：U416.1[交通运输工程—道路与铁道工程]