考虑空间变异性的地铁隧道地震动力响应分析  

Dynamic Response Analysis of Local Subway Tunnel under Spatially Varying Earthquake

作　　者：姚二雷 苗雨[1] 陈超[1] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074

出　　处：《重庆交通大学学报（自然科学版）》2017年第1期19-23,共5页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金项目(51378234);国家重点基础研究发展计划项目(973计划项目)(2011CB013800);华中科技大学优青培育基金项目(2014YQ008)

摘　　要：地铁隧道为超长线状结构,在动力分析中应考虑地震动空间变异性的影响。采用改进谱表示法合成了考虑场地效应、相干效应的人工地震动时程;将穿越不同性质场地的局部弯折隧道与直线隧道作为研究对象,利用有限元方法,研究了空间变异地震动作用下的局部地铁隧道的动力响应,并对计算结果进行了对比分析。结果表明:在穿越土层处,隧道将会发生一定的错动位移;相对于直线隧道,弯折隧道的截面弯矩较小,而截面剪力较大;隧道内的应力主要集中在场地交界处,且拉压应力带与隧道大体呈45°。Subway tunnels are extremely long linear structures, on which the spatial variance of earthquake can exert signifi-cant influence. Considering the local site response and incoherence effect, the artificial earthquake ground motions were gen-erated by using the improved spectral representation method. Through finite element method, the dynamic responses of localbending and straight subway tunnel across different sites to spatially varying earthquake were studied. The Numerical resultsshow that at the boundary between different sites, the tunnel displacement sharply changed. The section moment of bendingtunnel was higher than that of straight tunnel, while the shear force of bending tunnel was smaller than that of straight tunnelat the interface between different sites. Tunnel stress mainly concentrates on the interface between different sites and the an-gle between tensile-compressive area and tunnel axis is about 45 degree.

关 键 词：隧道工程 地铁隧道 地震动空间变异性 动力分析 

分 类 号：U451[建筑科学—桥梁与隧道工程]