不同埋置深度的山岭隧道地震响应分析

发布时间：2018-04-18 04:37

本文选题：埋置深度 + 山岭隧道　；参考：《岩土力学》2014年01期

【摘要】：根据大量震害资料的调查分析发现,地下结构埋置深度对其地震破坏程度影响很大。通过有限元方法计算8种不同埋置深度条件下的山岭隧道地震响应,并对计算模型的地震输入方法进行了验证,证明地震波输入处理方式的合理性。讨论埋深对结构动力响应的影响,提取衬砌关键节点的竖直向和水平向加速度、位移峰值,分析随着埋深的增大,加速度和位移峰值的变化情况,并以拱顶为例,计算每个埋深变化段的加速度和位移峰值变化率,得到了一定的规律性,如埋置深度从5 m增大到50 m,衬砌结构动力响应峰值大小下降较快。此外,还分析了埋深增大对衬砌结构内力峰值的影响。最后,提出在高烈度地震区修建隧道时其埋置深度尽可能不小于50 m,这为相关工程的修建提供了参考依据。
[Abstract]:According to the investigation and analysis of a large number of seismic damage data, it is found that the depth of buried underground structure has a great influence on the earthquake damage degree.The seismic response of mountain tunnel under 8 different buried depths is calculated by finite element method, and the seismic input method of the calculation model is verified, which proves the reasonableness of the seismic wave input processing method.The influence of buried depth on the dynamic response of the structure is discussed. The vertical and horizontal acceleration and displacement peak of the key nodes of lining are extracted. The variation of acceleration and displacement peak with the increase of buried depth is analyzed, and the arch roof is taken as an example.The change rate of acceleration and displacement peak value of each buried depth is calculated, and the regularity is obtained. If the buried depth increases from 5 m to 50 m, the peak value of dynamic response of lining structure decreases rapidly.In addition, the influence of the increase of buried depth on the peak value of internal force of lining structure is also analyzed.Finally, it is proposed that the buried depth of the tunnel in the high intensity seismic area is not less than 50 m, which provides a reference for the construction of the relevant projects.
【作者单位】：招商局重庆交通科研设计院有限公司;
【基金】：国家自然科学基金项目(No.51078324) 重庆市自然科学基金项目(No.2009BB6226)
【分类号】：U452.28

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