下穿隧道对地铁车站结构地震反应的影响研究

Influence of Undercrossing Tunnel on Seismic Response of Subway Station Structure

针对下穿隧道对临近地铁车站地震反应的影响问题,本文采用数值模拟方法,基于ABAQUS平台建立了隧道下穿大开地铁车站的整体三维非线性数值分析模型,通过改变地震动类型和隧道与车站结构的交叉净距,从结构构件的破坏比和竖向变形等角度,定量分析了不同工况下隧道下穿对车站结构地震反应的影响,并与单体大开车站原型结构的地震反应进行了对比。研究表明:下穿隧道会增大地铁车站结构中柱和侧墙的破坏比(相应的最大增幅:中柱为35%,侧墙为26%);同时,底板的竖向变形显著增大,最大增幅达到100%;随着交叉净距的增大,中柱和侧墙地震反应减小,而底板竖向沉降有所增大;下穿隧道对车站结构地震反应的影响范围约为隧道直径的3倍。研究成果对隧道近距离穿越地铁车站结构的设计与分析具有一定的参考价值。

The seismic response of subway stations is inevitably affected by the adjacent tunnel engi⁃neering.In this paper,three-dimensional non-linear numerical analysis models of a tunnel passing un⁃der the Daikai subway station are established using the ABAQUS platform.The simulation cases are set considering different ground motions and varying clear distances between the tunnel and the station structure.The influence of an undercrossing tunnel on the seismic response of subway station structure is quantitatively analyzed from the point of view of failure ratio and vertical deformation of the structur⁃al components,and compared with the seismic response of the prototype Daikai station without an un⁃dercrossing tunnel.The results show that the failure ratio of the central column and the lateral wall of the subway station structure increased with the existence of the undercrossing tunnel(the correspond⁃ing maximum increase rate is 35%for the central column and 26%for the lateral wall).The vertical deformation of the bottom floor increased maximumly by 100%.With the increase of the cross clear⁃ance,the seismic response of the central column and the lateral wall reduce,while the vertical settlement of the bottom floor increase.The influence area of the undercrossing tunnel on the seismic re⁃sponse of the station structure is about 3 times of tunnel diameter.The research results have certain reference significance for the design and analysis of the subway station structure where the tunnel pass⁃es through in a short distance.