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新建地铁隧道临近地表既有建筑物,在地震作用下地面临近建筑物的存在必然会对地层产生扰动,引起地铁隧道结构抗震性能的变化。该文以双线地铁隧道侧向下穿某既有多层建筑物为研究对象,构建地面建筑-土层-地铁隧道结构共同作用体系二维数值计算模型,分析临近建筑物对地铁隧道结构地震反应特性的影响。同时研究了隧道与建筑相对位置变化及不同的地震波对地铁隧道抗震性能的影响。研究结果表明:1临近建筑使得地铁隧道拱顶与拱底相对位移有所增大;2地表建筑物存在,使得隧道衬砌结构动内力比无建筑时明显增大,拱肩与拱脚处内力最大;3建筑物与隧道相对位置改变也会对地铁隧道抗震性能产生影响。
The newly built subway tunnel is adjacent to the existing buildings on the earth’s surface. Under the action of the earthquake, the presence of buildings near the ground will inevitably cause disturbance to the formation and cause changes in the seismic performance of the subway tunnel structure. In this paper, a two-dimensional numerical model for the interaction of the existing multi-storey buildings under the double-track subway tunnel is taken as the research object to construct a two-dimensional numerical model for the interaction between the structure of the ground building, the soil layer and the subway tunnel. Effect of reaction characteristics. At the same time, the influence of the relative position of tunnel and building and the different seismic waves on the seismic performance of metro tunnel are studied. The results show that: (1) The relative displacement between the dome and the arch base of subway tunnel is increased due to the adjacent buildings; (2) The existence of surface buildings makes the dynamic internal force of tunnel lining structure obviously increase than that without building, ; 3 The change of the relative position between the building and the tunnel will also affect the seismic performance of the subway tunnel.