Analysis On Seismic Dynamic Response Of Hole Section In Longquanshang No.1 Tunnel

Tunnel through fault fracture zone when more vulnerable to earthquake damage,this also is tunnel earthquake-reduction design difficulties of resistance. Researchthrough active fault zones seismic dynamic response of the tunnel, and has veryimportant theoretic value and practical significance. This paper USES FLAC3Dthrough active fault of the tunnel hole section seismic dynamic response by numericalsimulation. The main research contents:(1) Does not consider the tunnel live fault rupture seismic dynamic response bynumerical simulationAccording to the engineering geological conditions address WHC, established byFLAC3D seismic dynamic response, the three dimensional numerical model based onsite engineering earthquake condition, engineering seismic exploration material andthe seismic risk analysis process the bedrock acceleration curves obtained in seismicdynamic tunnel map, the numerical analysis, in response not considering fault rupture,loading the horizontal seismic waves, and then in the surrounding rock and lining ofseismic dynamic response of displacement, stress and acceleration is analyzed andsummarized the displacement, stress and the change rule of acceleration.(2) Consider living fault rupture tunnel, the seismic numerical simulationInconsidering mainly studied LongQuanYi live fault rupture, loading the horizontalseismic waves and fault rupture speed, three dimensional numerical model of thetunnel seismic dynamic response simulation, analysis fault rupture cases of cross-faultfracture zone tunnel seismic dynamic response characteristics. The surrounding rockand lining of displacement, stress and acceleration response, etc, and analyzed withdon't consider fault rupture cases of dynamic analysis results of comparison, then ananalysis on fault rupture seismic dynamic response of the tunnel effects. (3)Longquan mountain no.1 tunnel hole section shock absorption stepsoptimization analysisResearch change rigidity and set up different rock lining of lateral damping layerthickness of the two situations seismic dynamic response of the tunnel, and theinfluence with the original design case of dynamic analysis, and the results comparedto tunnel optimize the seismic shockproof measures. Through the research reached thefollowing conclusion:(1) Tunnel section after fault fracture zone, lining structure more vulnerable todamage.Faults emergent rupture can increase of tunnel lining in various parts of theseismic action.based displacement, stress and acceleration response.(2) Choose appropriate rock lining stiffness and setting different thickness of thelateral damping layer can significantly improve the shock absorption effect of thechannel.