In a dense urban environment, an in-service shield-tunnel is very likely to be subjected to additional loading from later-built surface structures, which could couple with the earthquake effects and aggravate the seismic damages of the tunnel structures. The main objective of this study aims at investigating the coupling effects of later-built surface building and earthquake loading on in-service subway shield tunnels. To this end, a series of numerical studies are carried out, employing a Finite Element model in which the segment joints and connecting bolts are simulated. The surface structure is assumed to be a 10-storey three-span reinforced concrete frame on a raft foundation. Some critical indexes, including lining deformation, dynamic lining forces, joint displacement, as well as the mechanical response of the joint bolt are used to evaluate the coupling effects. As a comparison, the responses without the surface building and those with tunnel ling simplified as equivalent continuous rings are also investigated. The results reveal that the coupling effects lead to much higher seismic response of the tunnel structure. The location of the surface building plays an important role on the seismic responses, which increase and then decrease with an increase in the distance s that is measured from the center of the surface building to the tunnel axis.

在人口稠密的城市环境中，在役的盾构隧道很可能会受到后期建造的表面结构的额外载荷，这可能会与地震效应耦合并加剧隧道结构的地震破坏。这项研究的主要目的是研究在役地铁盾构隧道中后期建造的地面建筑物和地震荷载的耦合效应。为此，采用有限元模型进行了一系列数值研究，在该模型中模拟了节段接头和连接螺栓。假定其表面结构为筏式基础上的10层三跨钢筋混凝土框架。一些关键指标，包括衬砌变形，动态衬砌力，接头位移，以及连接螺栓的机械响应用于评估耦合效果。作为比较，还研究了没有表面构建的响应和具有隧道环简化为等效连续环的响应。结果表明，耦合效应导致隧道结构的地震响应大大提高。地面建筑物的位置在地震响应中起着重要作用，其随着距离的增加而增加然后减少小号，其从表面到建筑隧道轴线的中心测量。