地下隧道抗震安全性分析方法研究

发布时间：2018-06-05 00:22

本文选题：地铁双隧道 + 地震响应分析　；参考：《天津大学》2014年硕士论文

【摘要】：近些年来,伴随着我国地铁建设的快速发展,地铁地下结构的抗震安全性分析受到了广泛地关注。我国是一个震害多发的国家,对地下隧道结构抗震安全性进行分析,对于发展地下结构抗震设计方法有重要意义。本文基于粘弹性边界方法和地震动输入等效节点力方法,并结合通用有限元软件ANSYS,建立了地下隧道抗震安全性分析问题的模型。通过与文献结果比较,表明本文的整体模型具有很高的精度,并以天津市深厚覆盖层场地中某地铁双隧道为例分别建立线性与非线性模型进行了地震响应分析,其中非线性模型采用等效线性化方法模拟土体非线性,分别考虑衬砌中混凝土和钢筋的非线性,并考虑衬砌和土体之间的接触。本文给出了不同隧道间距情况下,地震作用下衬砌的应力时程和峰值结果。之后,对窄间距双隧道模型输入与El Centro波具有同一统计特征——时变功率谱的30条人工地震波样本,并对结果进行了数理统计。研究表明,隧道间距对地震作用下衬砌应力具有重要影响。当两个隧道相距较近时,隧道之间存在明显地相互作用,最大衬砌主应力幅值有明显的提高,且衬砌最大主应力均出现在两隧道相邻区域。相比于单隧道模型,双隧道模型的衬砌主应力增幅最高可达37%。本文模型可以用于复杂场地中地下隧道的抗震分析。
[Abstract]:In recent years, with the rapid development of subway construction in China, the seismic safety analysis of underground structures has received extensive attention. Our country is a country with frequent earthquake damage. It is very important to analyze the seismic safety of underground tunnel structure for the development of seismic design method of underground structure. Based on the viscoelastic boundary method and the equivalent nodal force method of ground motion input, combined with the general finite element software ANSYS, a model for seismic safety analysis of underground tunnels is established. By comparing with the results of literature, it is shown that the whole model in this paper has a high accuracy, and the linear and nonlinear models of a double subway tunnel in a deep overburden site in Tianjin are established for seismic response analysis. The nonlinear model uses the equivalent linearization method to simulate the nonlinearity of soil, considering the nonlinearity of concrete and reinforcement in lining, and considering the contact between lining and soil. In this paper, the results of stress history and peak value of lining under different tunnel spacing are given. After that, 30 artificial seismic waves with the same statistical characteristic as El Centro wave are input to the two-tunnel model with narrow spacing, and the results are statistically analyzed. The results show that tunnel spacing plays an important role in lining stress under earthquake. When the two tunnels are close to each other, there is obvious interaction between the two tunnels, and the maximum main stress amplitude of the lining is obviously increased, and the maximum principal stress of the lining appears in the adjacent region of the two tunnels. Compared with single tunnel model, the maximum increase of main stress of lining in double tunnel model is 37. This model can be used for seismic analysis of underground tunnels in complex sites.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U452.28

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