跨断层铁路隧道衬砌结构地震动力响应分析

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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

Abstract：Thegeological situation inthesouthwest mountainousarea of China iscomplicated.During theconstructionof mountaintunnel，itisinevitabletocrossthefaultfracturezone，andthecross-faulttunneliseasytobedestroyedunderthe actionofearthquake.Inordertostudythebasiclawofdynamicresponseofcross-faulttunnelunderearthquakeaction，Yiliang tunnelprojectof Chongqing-Kunming high-speedRailwayistakenas theresearchobject，theseismic dynamicresponseof cross-faultrailway tunnel isanalyzedbyFLAC3Dbasedonwave theoryandfinitediferencesimulationmethod.Inthe analysis，theinfluenceof ground motionexcitationdirectionand tunnelspacingontunnelstressanddisplacementisconsidered. Theresultsshowthatboth transverseandlongitudinal groundmotion excitation directionsareunfavorable，andthefectsof transverseandlongitudinal ground motionshouldbetaken intoaccount inseismicdesign.Tunnelspacing hasanimportant ffect ontheseismicresponseof thetunel.With theincreaseof tunnel spacing，theinteractionbetweenthetunnelswillgradually weaken.Whenthetunnel spacing exceeds 3times thetunneldiameter，the interaction betweenthetunnelscan be basically ignored.Thefindingsofthisstudycanprovideatheoretical basisandengineringreferencefortheseismicdesignandsafety assessment of cross-fault railway tunnels.

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

0 引言

随着我国隧道工程快速发展，西南地区隧道建设规模也在不断加大。（剩余7034字）