浅埋出入口通道交叉段地震动力特性及稳定性分析
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摘要
地铁出入口通道通常覆土较浅,结构形式变化较大,刚度不连续,特别在交叉口段,结构衔接薄弱,抗震性能差。基于土-结构相互作用模型,利用黏-弹性边界条件,运用时程分析方法研究出入口通道交叉口段地震动力响应。对交叉口段地震动力特性及稳定性进行分析总结,得出交叉口段位移、应力及加速度的动力响应及分布特性,提出其抗震加固部位及范围等的处置措施,以期为高震区地铁抗减震设计提供一定参考。
The exit/entrance tunnels of Metro works usually have shallow covers,dramatic variations of structure types and interrupted rigidity.Especially in the intersection parts,the structures have poor connections and poor aseismic behavior.The dynamic seismic response of the intersection parts of the exit/entrance tunnels of Metro works is studied on basis of soil-structure interacting model,by means of visco-elastic boundary and time-dependent analysis.The dynamic seismic behavior and stability of the intersection parts are analyzed and summarized,the dynamic response and distribution rules of the displacement,stress and acceleration of the intersection parts are obtained,and positions and scopes of the aseismic reinforcement are proposed.The paper can provide reference for the aseismic design of Metro works in high seismic regions in the future.
The exit/entrance tunnels of Metro works usually have shallow covers,dramatic variations of structure types and interrupted rigidity.Especially in the intersection parts,the structures have poor connections and poor aseismic behavior.The dynamic seismic response of the intersection parts of the exit/entrance tunnels of Metro works is studied on basis of soil-structure interacting model,by means of visco-elastic boundary and time-dependent analysis.The dynamic seismic behavior and stability of the intersection parts are analyzed and summarized,the dynamic response and distribution rules of the displacement,stress and acceleration of the intersection parts are obtained,and positions and scopes of the aseismic reinforcement are proposed.The paper can provide reference for the aseismic design of Metro works in high seismic regions in the future.
引文
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[2]刘晶波,李彬.地铁地下结构抗震分析及设计中的几个关键问题[J].土木工程学报,2006(6):106-110.
[3]顾俊,吴继敏,丁向东.地铁隧道非线性地震响应动力分析[C]//第三届全国防震减灾工程学术研讨会论文集.南京:中国土木工程学会,2007
[4]于翔,陈启亮,赵跃堂,等.地下结构抗震研究方法及其现状[J].解放军理工大学学报:自然科学版,2000,1(5):63-69.
[5]肖广智.软弱地层中采用浅埋暗挖法修建地铁车站几个问题的探讨[J].岩石力学与工程学报,2001(4):567-572.
[6]郑颖人,沈珠江,龚晓南.岩土塑性力学原理[M].北京:中国建筑工业出版社,2002.
[7]潘昌实.隧道力学数值方法[M].北京:中国铁道出版社,1995.
[8]R W Clough,J Penzien.结构动力学[M].王光远,译.北京:科学出版社,1981.
[9]刘晶波,昌彦东.结构-地基动力相互作用问题分析的一种直接方法[J].土木工程学报,1998,31(3):55-64.
[10]刘晶波,谷音,杜义欣.一致粘-弹性人工边界及粘-弹性边界单元[J].岩土工程学报,2006,28(9):1070-1075.
[11]刘晶波,杜义欣,闫秋实.粘-弹性人工边界及地震动输入在通用有限元软件中的实现[J].防灾减灾工程学报,2007,27(4):38-42.
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