空间变异地震动作用下地铁隧道抗震响应  

Seismic Response of Subway Tunnels Under Spatially Varying Ground Motions

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：《土木工程与管理学报》2018年第1期99-103,145,共6页Journal of Civil Engineering and Management

基　　金：国家重点研发计划课题(2016YFC0800206);国家自然科学基金(51378234)

摘　　要：采用基于功率谱矩阵奇异值分解的空间变异地震动合成方法,快速高效地合成了考虑行波效应、相干效应及场地效应的多点加速度时程。基于ABAQUS软件研发的动力有限元计算平台,建立了三维双隧道–土体有限元模型,研究了多点输入下地铁隧道的非线性地震反应特性,并与一致输入下的地震反应特性进行了对比。另外,考察了场地效应对地铁隧道抗震响应的影响。结果表明:对于均匀场地,一致输入下的地表、隧道地震响应高于多点输入下的响应;对于非均匀场地,一致输入下的地表、隧道响应明显低于多点输入下的响应;在场地交界处,隧道截面的剪应力和水平位移会产生突变。Based on the singular value decomposition of the power spectral matrix, multipoint acceleration time histories were generated in which the wave propagation effect,incoherence effect and local site effect are considered. According to the dynamic finite element method of ABAQUS,3D double tunnels-soil model was established. The characteristic of nonlinear seismic response of subway subjected to multiple support excitation was analysed,which was compared to the characteristic of nonlinear seismic response of subway subjected to identical support excitation. In addition,the influence of the local site effect on the seismic response of field surface and liner was investigated.Numerical results show that for uniform ground,the seismic responses of surface and tunnel under identical support excitation are higher than those of multi support excitation. In the case of non-uniform soil property,the seismic response under identical support excitation is lower than those of multi support excitation in soft soil. The discontinuity of ground may cause the sharp variance of the horizontal displacement and shear stress of tunnel in the longitude direction.

关 键 词：地铁隧道 空间变异地震动 抗震响应 多点输入 一致输入 

分 类 号：U452.28[建筑科学—桥梁与隧道工程]