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刘佩怡^1，2，李   忠^1，2

 

 

（1.石家庄铁道大学 土木工程学院，石家庄 050043；

 

2.石家庄铁道大学 道路与铁道工程安全保障教育部重点实验室，石家庄 050043）

摘要：我国西南部山区地质情况复杂，在山岭隧道修建过程中，不可避免会跨断层破碎带，跨断层隧道在地震作用下极易发生破坏。为研究跨断层隧道在地震作用下动力响应基本规律，以渝昆高铁彝良隧道工程实例为研究对象，基于波动理论进行FLAC 3D数值模拟，对跨断层铁路隧道地震动力响应进行分析。分析中考虑了地震动激振方向、隧道间距对隧道应力以及位移的影响。结果表明:横向与纵向地震动激励方向均为不利激振方向，在抗震设计时应重点考虑横向和纵向地震动的影响；隧洞间距对隧道的地震响应具有重要影响，随着隧道间距增加，隧道间的相互作用会逐渐减弱，当隧道间距超过3倍的隧道直径时，隧道间的相互作用可以基本忽略。研究结果可为跨断层铁路隧道的抗震设计与安全评估提供理论依据与工程借鉴。

关键词：铁路隧道；断层破碎带；数值模拟；波动理论；动力响应

中图分类号：U452.28

文献标志码：A

文章编号：1005-8249（2025）06-0117-06

DOI：10.19860/j.cnki.issn1005-8249.2025-06-020

 

 

LIU Peiyi^1,2,LI Zhong^1,2

 

 

(1.School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China；

 

2.Key Laboratory of Roads and Railway Engineering Safety Control,Ministry of Education,

 

Shijiazhuang Tiedao University Shijiazhuang 050043,China)

 

Abstract：The geological situation in the southwest mountainous area of China is complicated.During the construction of mountain tunnel,it is inevitable to cross the fault fracture zone,and the cross-fault tunnel is easy to be destroyed under the action of earthquake.In order to study the basic law of dynamic response of cross-fault tunnel under earthquake action,Yiliang tunnel project of Chongqing-Kunming high-speed Railway is taken as the research object,the seismic dynamic response of cross-fault railway tunnel is analyzed by FLAC 3D based on wave theory and finite difference simulation method.In the analysis,the influence of ground motion excitation direction and tunnel spacing on tunnel stress and displacement is considered.The results show that both transverse and longitudinal ground motion excitation directions are unfavorable,and the effects of transverse and longitudinal ground motion should be taken into account in seismic design.Tunnel spacing has an important effect on the seismic response of the tunnel.With the increase of tunnel spacing,the interaction between the tunnels will gradually weaken.When the tunnel spacing exceeds 3 times the tunnel diameter,the interaction between the tunnels can be basically ignored.The findings of this study can provide a theoretical basis and engineering reference for the seismic design and safety assessment of cross-fault railway tunnels.

 

Key words：railway tunnel;fault fracture zone;numerical simulation;wave theory;dynamic response

 

作者简介：刘佩怡（2001—），女，硕士研究生，研究方向:隧道及地下工程。

收稿日期：2024-09-02