基于黏弹性边界的地铁双隧道地震响应分析

发布时间：2018-09-05 19:15

【摘要】：采用黏弹性边界方法和地震动输入等效节点力方法,结合通用有限元软件ANSYS,建立地铁双隧道地震响应分析问题的模型。通过与间接边界元方法文献结果比较,对整体模型进行精度验证,结果表明,黏弹性边界方法和地震动输入等效节点力方法可以获得非常满意的计算精度。分别通过平面单元和梁单元对衬砌应力进行数值模拟,结果表明,平面单元和梁单元均可以很好地模拟衬砌应力。以天津市深厚覆盖层场地中某地铁双隧道为例进行地震响应分析,研究表明,隧道间距对衬砌地震应力具有重要影响。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对区域。该模型可以用于复杂场地中地下结构的抗震分析。
[Abstract]:Using the viscoelastic boundary method and the equivalent nodal force method of ground motion input, combined with the general finite element software ANSYS, the seismic response analysis model of subway double-tunnel is established. By comparing with the results of indirect boundary element method, the accuracy of the whole model is verified. The results show that the viscoelastic boundary method and the equivalent nodal force method of ground motion input can obtain very satisfactory accuracy. The lining stress is simulated by plane element and beam element respectively. The results show that both plane element and beam element can simulate lining stress well. The seismic response analysis of a subway double tunnel in a deep overburden site in Tianjin is carried out. The results show that the spacing of the tunnel has an important effect on the seismic stress of the lining. When the two tunnels are close to each other, there is obvious interaction between the two tunnels, the maximum main stress amplitude of the lining is obviously increased, and the maximum principal stress of the lining appears in the relative region of the two tunnels. The model can be used for seismic analysis of underground structures in complex sites.
【作者单位】：天津大学土木工程系;天津市土木工程结构及新材料重点实验室;
【基金】：天津市应用基础研究重点项目(12JCZDJC29000) 国家自然科学基金(51378348)
【分类号】：U452.28;U231.1

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