【摘要】 单洞双层隧道是一种具有广阔应用前景的地下结构形式,大高跨比及中隔板约束使其拥有独特的力学特性。为了给单洞双层隧道的结构抗震优化设计提供依据,以伏龙坪单洞双层隧道为背景,利用FLAC3D软件,采用动力时程分析法研究中隔板位置对单洞双层隧道抗震性能的影响,并与静力分析结果进行比较。结果表明:中隔板的使用让双层隧道的抗震性能大幅提升,无中隔板时的边墙动力水平相对位移幅值较有中隔板时放大2.9~3.4倍;边墙动力水平相对位移幅值可以作为评价衬砌结构动力反应的依据;受动力作用,衬砌位移、应力都会有显著放大;静力作用与动力作用时,中隔板的最佳位置不同。更多还原

【Abstract】 The single-hole double-decked tunnel is an underground structure style with broad application prospects,and it has unique mechanical properties because of the large ratio of depth to span and the partition constraints of baffle plate.Taking Fulongping double-decked tunnel as an example,the dynamic time history analysis method is used to study the impact of baffle plate on the seismic performance of the single-hole double-decked tunnel with software FLAC3D.The dynamic results are compared with those of static analysis,in order to provide a basis for structural optimization design on earthquake resistance for single-hole double-decked tunnels.The results prove that the baffle plate improves the seismic performance of tunnels sharply,and the dynamic relative horizontal displacement amplitude without baffle plate is 2.9-3.4 times the amplitude with baffle plate.The dynamic relative horizontal displacement amplitude of side wall can be used to evaluate the dynamic response of the lining.There is a significant amplification in displacement & stress of lining under dynamic force.It is different in the optimum position of baffle plate under static loading and dynamic loading,respectively.更多还原