2014年5月下 施工技术 第43卷第10期 CONSTRUCTION TECHNOLOGY 127 D0I:10.7672/8gis2014100127 高烈度区黄草坪山岭隧道地震动破坏机理研究 李旭伟，苏天宝 (河南城建学院，河南平顶山467036) [摘要]为了研究高烈度区山岭隧道地震动破坏机理，基于G318黄草坪2上黄草坪隧道，利用离散元分析软件建 立数值分析模型，深人研究了地震波的传播特性及影响隧道地震稳定性的主控因素，具体得出以下结论：①地震波 在洞口处的集中效应、地震波的卓越频带以及隧道纵向围岩的差异性是造成山岭隧道破坏的3个主控因素；②隧 道位移随地震频率的增大而减小，低频地震波导致的隧道位移幅值明显高于高频地震波，因此低频地震波更易造 成隧道结构的破坏；③围岩连接处容易造成衬砌的开裂和剥落，需要进行单独设计和施工. [关键词]隧道工程；地震；破坏分析；研究 [中图分类号]TU475;U451 [文献标识码]A [文章编号]1002-8498(2014)10-0127-04 Research on the Failure Mechanism of Huangcaoping Mountain Tunnel in High Intensity Zone Subjected to Earthquake Li Xuwei Su Tianbao (He'nan University of Urban Construction Pingdingshan He'nan 467036 China) Abstract:In order to research the failure mechanism of mountain tunnel in high intensity zone this paper establishes a numerical model using discrete element software based on the Huangcaoping tunnel at G318.The spreading characterize of seismic wave and the controlling factors which have influences on the seismic stability of mountain tunnel the conclusions are shown as follows:first the effects of hole the predominate frequency of seismic wave and the differences of the surrounding rock are the three factors causing the failures of the mountain tunnel.Second the amplitude of displacements at the top of the surrounding rock increases with the reduction of the frequency of the seismic wave.The displacement at the top of the tunnel triggered by the high frequency band is less than that triggered by low frequency band.Therefore th...
高烈度区黄草坪山岭隧道地震动破坏机理研究.pdf
