孙建春，张照华，高  波
    (西南交通大学土木工程学院，成都 610031)

[摘要] 在高烈度地震带，地下工程洞口段有可能遭受严重震害，采用FLAC3D和ANSYS软件，结合西部抗震项目，从土-结构相互作用模型出发，运用数值分析方法对隧道洞口段进行三维模拟，并对模拟结果进行分析总结，提出隧道抗震设计中应注意的几个事项及建议。
[关键词] 隧道；洞口；抗震；FLAC3D

    Study for seismic responses of underground structure entrance under earthquake
    Sun Jianchun, Zhang Zhaohua, Gao Bo
    ( School of Civil Engineering, Southwest Jiaotong University, Chengdu 61003 1, China)

Abstract: In high earthquake intensity area, the entrance of tunnel may be fall into nun for the seismic motion. Based on soil-structure interaction model and the west project of shock absorption, the FLAC3D and ANSYS softwares and numerical analysis method were adopted to compute the tunnel entrance. The results obtained were discussed and some measures and advises for design were presented.
Keywords: tunnel; the entrance of tunnel; shock absorption; FLAC3D