地震作用下盾构隧道衬砌结构动力响应分析

盾构隧道衬砌结构在地震载荷作用下的安全越来越受到重视，本文运用有限元软件数值模拟地震作用过程，分析地震作用下不同管片接头模型中管片性能的变化规律，结果表明：盾构隧道在地震横向作用下产生较大的横向位移，不同管片接头模型中管片的位移时程曲线趋势基本一致，且随着管片刚度减小而增大，但均比地表土体横向位移小很多|地震作用下不同管片接头模型中管片和连接螺栓的内力分布情况相类似，随着管片刚度减小，管片横向方向和剪切方向的应力均减小，连接螺栓的轴力、剪力和弯矩均增大，其中剪力增加的幅度最大，弯矩最大值位于隧道两拱腰处。

Dynamic response analysis of lining structure for shield tunnel under seismic loading

Shield tunnel as a tool with the effect of alleviating the pressure of ground traffic for big cities, its security is getting more and more attention. Considering the seismic damage may take place in shield tunnels of large cities, the change law of performance of segment in different segment joint model subjected to seismic load were analyzed by implementing a finite software to numerical simulation of the seismic process. According to the results, shield tunnel produces the larger lateral displacement under the lateral seismic action, and the curve trends of lateral displacement of segment with time are basically identical. The lateral displacement of segment increases with the decrease of the segment stiffness, and it is a lot smaller than the lateral displacement of ground. The internal force distribution of segment and connecting bolt in different segment joint model are similar, the lateral and shear direction stress of segment decreases and the axial force, shear force and bending moment of connecting bolt increase with the decrease of the segment stiffness. Beside, the increase size of shear force of connecting bolt is maximum, and the maximum bending moment of connecting bolt locates in two hances of tunnel.