考虑水平及竖向地震影响的盾构隧道动力分析及Pushover方法研究

发布时间：2018-05-20 06:45

本文选题：盾构隧道 + 竖向地震反应　；参考：《工程抗震与加固改造》2017年S1期

【摘要】：为了研究竖向地震对盾构隧道的影响,并得到考虑竖向地震影响的简化静力计算方法,基于静动力统一粘弹性人工边界单元,分别建立了包含周围地基土-盾构隧道结构体系的二维非线性有限元动力和静力模型,研究了地铁隧道结构的地震反应特性,对比了仅考虑水平地震和同时考虑竖向地震输入情况下,盾构隧道的动力反应,分析了竖向地震对盾构隧道的动力性能的影响,可以看出,竖向地震对地下盾构隧道影响较大,应考虑竖向地震影响,并提出一些抗震措施建议.通过静力计算模型,基于一维动力模型输入水平地震和竖向地震波作用,获得土层的分布形式,得到一维场地反应计算目标位移,研究了考虑水平及竖向输入的静力推倒的弹塑性方法(Pushover分析)的加载模式,并采用竖向均布的体力模拟竖向地震动,与动力时程计算结果进行对比研究,讨论了考虑竖向Pushover方法的适用性,提出了考虑竖向地震荷载的静力简化方法,采用倾斜度作为抗震性能指标,并讨论了隧道结构的地震破坏准则。
[Abstract]:In order to study the influence of vertical earthquake on shield tunnel and to obtain a simplified static calculation method considering vertical earthquake effect, the static and dynamic unified viscoelastic artificial boundary element is used. Two dimensional nonlinear finite element dynamic and static models including the surrounding soil-shield tunnel structure system are established, and the seismic response characteristics of the subway tunnel structure are studied. The dynamic response of shield tunnel is compared with horizontal earthquake and vertical earthquake input. The influence of vertical earthquake on the dynamic performance of shield tunnel is analyzed. It can be seen that vertical earthquake has great influence on underground shield tunnel. The vertical earthquake effect should be considered and some seismic measures should be proposed. Based on the static model and the input of horizontal earthquake and vertical seismic wave, the distribution form of soil layer is obtained, and the target displacement is calculated by one-dimensional site response. In this paper, the loading mode of static push-down elastoplastic method with horizontal and vertical input is studied, and the vertical uniform force is used to simulate the vertical ground motion, and the results are compared with the results of dynamic time-history calculation. In this paper, the applicability of the vertical Pushover method is discussed, and the static simplified method considering the vertical seismic load is proposed. The slope is used as the seismic performance index, and the seismic failure criterion of the tunnel structure is discussed.
【作者单位】：福州大学土木工程学院;
【基金】：国家自然科学基金资助(No.51108088,No.51578157)~~
【分类号】：U452.28;U455.43

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