车致振动在盖挖逆作法施工地下结构中的传播规律研究
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摘要
以某铁路车站站场下地下结构盖挖逆作法施工为工程背景,首先现场测试分析了城际铁路列车通过时地下结构的振动响应,其后建立了动车组-轨道结构-地下结构系统耦合动力分析模型,仿真分析了城际铁路列车通过地下结构的全过程,系统探讨了地下结构的车致振动响应及其空间传播规律,揭示了地下结构车致振动机理。研究结果表明,地下结构车致振动随着与运营线路的距离加大而逐渐衰减,且衰减速度逐渐减小;结构动力响应随列车运行时速的提高而增大。
Based on the underground structure being constructed by cover and excavation up-down method under a railway station yard,the vibration response of the underground structures was tested when intercity train was operating.The dynamic analysis model of EMU-track structure-underground structures coupled system is set up.The structure vibration response and propagation characteristic of vehicle-induced vibration are analysed systematically while intercity train running on the underground structures by means of the theories of random vibration.The mechanism of vehicle-induced vibration of underground structures is revealed.The results of the study indicated that the vehicle-induced vibration response of underground structures and the decay rate are getting weaker gradually with increasing distance from railway line.The structural dynamic response increases with increased train speed.
Based on the underground structure being constructed by cover and excavation up-down method under a railway station yard,the vibration response of the underground structures was tested when intercity train was operating.The dynamic analysis model of EMU-track structure-underground structures coupled system is set up.The structure vibration response and propagation characteristic of vehicle-induced vibration are analysed systematically while intercity train running on the underground structures by means of the theories of random vibration.The mechanism of vehicle-induced vibration of underground structures is revealed.The results of the study indicated that the vehicle-induced vibration response of underground structures and the decay rate are getting weaker gradually with increasing distance from railway line.The structural dynamic response increases with increased train speed.
引文
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[2]铁道第三勘察设计院.TB10002.5—2005铁路桥涵地基和和基础设计规范[S].北京:中国铁道出版社,2005.
[3]重庆交通科研设计院.JTG/T B02-01—2008公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.
[4]刘学增,朱合华.上海典型土层与混凝土接触特性的研究[J].同济大学学报,2004(5):601-606.
[5]袁晓铭,孙锐,孙静,等.常规土类动剪切模量比和阻尼比试验研究[J].地震工程与工程振动,2000(4):133-139.
[6]铁道部.铁运[2006]146号铁路线路修理规则[S].北京:中国铁道出版社,2006.
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