双连拱地铁隧道衬砌结构地震动力响应特征  

Seismic Dynamic Response Characteristics of Metro Double-arch Tunnel Lining Structure

作　　者：左红伟[1] 马甲宽 任翔[2] 白兰 喻畅 ZUO Hong-wei;MA Jia-kuan;REN Xiang;BAI Lan;YU Chang(School of Civil Engineering, Qing Dao University of Technology, Qingdao 266033, China;School of Civil Engineering, Chang’an University, Xi’an 710064, China;Xi’an Changqing Technology Engineering Co. Ltd, Xi’an 710054, China)

机构地区：[1]青岛理工大学土木工程学院,青岛266033 [2]长安大学建工学院,西安710064 [3]西安长庆科技工程有限责任公司,西安710054

出　　处：《科学技术与工程》2021年第30期13139-13147,共9页Science Technology and Engineering

基　　金：中铁四局科研项目(2018-97)。

摘　　要：以西安地铁五号线某区段双连拱隧道工程为背景,建立有限元动力分析模型,选取El-Centro波、西安人工波、Taft波三种代表性波源,分析了SV波作用下地铁双连拱隧道衬砌结构的加速度、动应力、结构变形等动力响应特征,研究结果表明:中隔墙顶部及底部等存在明显拐角的位置应力变化明显高于其他部位,是双连拱隧道的高风险点,隧道抗震设计中应重点关注;地震结束后隧道结构即使未发生破坏,由于所处应力状态的改变,其安全性可能已经降低;隧道变形整体表现为上部结构相对于隧道底板随地震作用产生水平偏移运动,而其幅值受到地震波的峰值加速度、时程曲线分布形式等方面因素影响。A finite element dynamic analysis model was established based on a section of Xi'an Metro Line 5 double-arch tunnel project.Three representative wave sources,El-Centro wave,Xi'an artificial wave and Taft wave,were selected to analyze the dynamic response characteristics such as acceleration,dynamic stress and structural deformation of the metro double-arch tunnel's lining under the action of SV wave.The results show that the stress variation at the top and bottom of the middle partition wall with obvious corners is obviously higher than other parts,which is the high-risk point of double arch tunnel,and should be paid more attention to in the seismic design of the tunnel.Even if the tunnel structure is not damaged after the earthquake,its safety may be reduced due to the change of stress state.The overall deformation of the tunnel shows that the superstructure moves horizontally with the seismic load relative to the tunnel bottom,and its amplitude is affected by the peak acceleration of seismic wave and the distribution form of time-history curve.

关 键 词：黄土 双连拱隧道 地震动力响应 有限元 时程分析 

分 类 号：U452[建筑科学—桥梁与隧道工程]