武汉长江隧道横断面地震响应分析

随着盾构法在隧道施工中越来越广泛的应用,其抗震性能的研究日益受到社会各界的关注.本文重点研究了武汉长江隧道工程盾构段横断面的地震响应规律.首先利用等效线性化方法对各典型地层构造处进行一维场地地震响应分析,以隧道所在土层的最大剪应变水平作为判断衬砌结构受力大小的依据,并选择危险控制断面.然后对该断面建立二维模型进行动力有限元计算,计算模型考虑了各类管片接头的影响及边界处能量的传输,能够有效地模拟土--结构系统的动力相互作用.计算表明在静力和地震共同作用下,隧道横断面的抗震性能满足要求.

Transverse Seismic Response Study of Wuhan Changjing Tunnel

Along with the shield in tunnel construction more and more widely used, its seismic behavior receives attention from researchers day by day. In this paper, the transverse seismic response of the shield section of Wuhan Changjiang Tunnel is mainly studied. First, equivalent linearization methods are applied to research the one-dimensional seismic response of typical strata. Then the dangerous sections are chosen according to the maximum shear stress of the layer where tunnel lies. A two-dimensional finite element model, which considered the effects of different type of segment joints and the property of infinite half space and could effectively simulate the dynamic soil-structure interaction, is established. The computation indicates that the transverse seismic response of the tunnel can satisfy the request under static effect and earthquake.