【摘要】 运用Newmark隐式时间积分有限元法,选用EI-Centro地震波,对洞口段隧道结构进行了二维地震响应数值模拟。得出了隧道结构的自振特性,地震波烈度和地震激励方向对隧道地震响应的影响规律:围岩性能越好,刚度越强,结构的自振频率越高;隧道结构在不同烈度地震中的响应是按地震波的最大加速度的比值增长。对研究洞口段隧道结构的抗震设计具有一定的参考价值。更多还原

【Abstract】 In the light of the Newmark Step-by-Step Implicit Integration Method,and with the EI-Centro seismic waves adopted,a two-dimension seismic response numerical simulation is made of the portal section of the tunnel,which showed the influential laws of the vibration characteristics of the tunnel structure,the influence of the seismic waves and the excitation on the tunnel seismic response:the better the performance of the surrounding rock,the greater the rigidity of the tunnel,the higher the vibration frequency of the tunnel structure;the response of the tunnel structure to the intensity of the seismic waves varies with the ratio of the maximum acceleration of the seismic wave.The paper may serve as a useful reference for the seismic design of tunnel structures.更多还原