隧道-土-地表建筑相互作用体系下的地表建筑隔震研究

Research on Seismic Isolation of Surface Buildings under Tunnel-soil-surface Building Interaction System

伴随着我国城市化的快速发展,城市地下空间大量开发,而地震作用下地铁隧道与邻近地表建筑之间的存在的相互作用加剧了体系地震响应,不利于结构抗震。通过有限元软件ABAQUS,构建起隧道-土-地表建筑相互作用的三维计算模型,通过分析地表建筑物及隧道的加速度、位移及应力反应,探究在地表建筑基础顶面与上部结构之间施加隔震层后对地表建筑的减震效果及对邻近隧道的地震响应影响。结果表明:(1)通过在地表建筑通过设置隔震层,延长了地表结构的自振周期,地表建筑的加速度、层间位移及最大主应力均得到明显降低,提高了地表建筑的抗震性能。(2)地表建筑设置隔震层后,邻近地下隧道的地震响应相较于地表非隔震结构体系,其隧道各关键点水平绝对位移及拱顶和拱底相对位移均有所放大,不利于隧道结构抗震。

Along with the rapid development of urbanization in China,a large amount of urban underground space has been developed,but the interaction between subway tunnels and adjacent surface buildings under the action of earthquakes intensifies the seismic response of the system,which is not conducive to system structure seismic resistance.Through the finite element software ABAQUS,a three-dimensional computational model of tunnel-soil-surface building interaction was constructed.By analyzing the acceleration,displacement and stress response of surface buildings and tunnels,the seismic reduction effect on surface buildings and the seismic response effect on adjacent tunnels after applying a seismic isolation layer between the top surface of the foundation of surface buildings and the superstructure are investigated.The results show that:(1)By installing a seismic isolation layer in the surface building,the self-oscillation period of the surface structure is extended,and the acceleration,inter-story displacement and maximum principal stress of the surface building are significantly reduced,which improves the seismic performance of the surface building.(2)After the seismic isolation layer is installed in the surface building,the seismic response of the adjacent underground tunnel is compared with the surface non-seismic isolation structure system,and the horizontal absolute displacement of each key point of the tunnel and the relative displacement of the vault and arch bottom are amplified,which is not conducive to the seismic resistance of the tunnel structure.