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随着盾构法在隧道施工中越来越广泛的应用,盾构隧道横断面抗震性能的研究日益受到业界关注。以武汉长江隧道为例,对土体采用D-P本构模型,盾构隧道结构采用梁-弹簧模型,建立盾构隧道横断面二维模型进行动力有限元计算,该模型顶部采用自由边界,侧面采用自由场边界,底部采用静态边界。选用0.1g的天津波和场地人工波作为激励,研究了盾构隧道结构的加速度、变形和内力响应。结果表明:盾构隧道的拱顶与拱底的加速度响应大于隧道左侧、右侧;隧道拱底的绝对位移响应最大;地震作用对隧道衬砌结构的内力增量较为明显。目前的隧道结构设计可以满足结构抗震性能要求。
With the more and more application of shield method in tunnel construction, the research of shield tunnel cross-section seismic performance has been paid more and more attention by the industry. Taking Wuhan Yangtze River Tunnel as an example, the DP constitutive model is adopted for the soil, the beam-spring model is used for the shield tunnel, and the two-dimensional model of the cross-section of the shield tunnel is established for the dynamic finite element calculation. The top of the model adopts the free boundary, Free field boundary, the bottom of the static boundary. 0.1g Tianjin wave and site artificial wave were selected as stimuli to study the acceleration, deformation and internal force response of the shield tunnel structure. The results show that the acceleration response of the shield tunnel to the dome and arch base is larger than the left and right sides of the tunnel. The absolute displacement response of the tunnel arch base is the largest. The internal force increment of the tunnel lining structure is more obvious. The current tunnel structure design can meet the seismic performance requirements of the structure.