地铁列车运行引起的振动对精密仪器影响的预测研究
|
摘要
采用一种动力有限元数值模型,并结合道路交通现场振动测试,对北京地铁8号线列车运行对邻近地铁线路的某科研楼内精密仪器的振动影响进行了预测研究,并比较了普通无砟轨道和浮置板轨道两种工况下楼内外的振动响应。提出了该有限元模型的网格划分、边界条件、阻尼施加等建模原则,采用实测的钢轨振动加速度计算而来的动态轮轨力作为该模型上的激励力。结果表明:采用该动力有限元模型可以有效地预测地铁列车运行引起的振动;浮置板轨道是一种有效的减振措施,在其工作频段内有显著的减振效果,但对低频振动没有减振效果,而且在其自振频率处还有一定的放大作用;地铁8号线开通后,地铁列车振动再叠加上道路交通引起的振动会对科研楼内部分精密仪器的正常工作造成一定的影响,仪器基座处可采取相应的隔振措施来减小振动。
The effect of vibration induced by metro traffic on sensitive instruments in a building near metro line 8 in Beijing was predicted by means of a dynamic finite element model combined with in-situ measurement of road traffic induced vibration,and vibration responses inside and outside the building for cases of general non-ballast track and floating slab track in tunnels were compared.Here,dividing meshes establishing boundary conditions and exerting damping in the finite element model were presented,the calculated dynamic wheel-rail force based on the in-situ vibration measurement on the rails are applied in the model.The results showed that the vibration induced by passage of metro trains in tunnels can be effectively predicted using the dynamic finite element model;the floating slab track is an effective vibration mitigation measure,it can efficiently reduce vibration in its work frequency range;however,the floating slab track cannot reduce vibration at lower frequencies,and has a certain action of amplifying vibration at its natural frequencies;the combined vibration due to road traffic and metro traffic affects a few sensitive instruments after starting the metro line 8,it can be reduced with passive isolation measures under the bases of equipments.
The effect of vibration induced by metro traffic on sensitive instruments in a building near metro line 8 in Beijing was predicted by means of a dynamic finite element model combined with in-situ measurement of road traffic induced vibration,and vibration responses inside and outside the building for cases of general non-ballast track and floating slab track in tunnels were compared.Here,dividing meshes establishing boundary conditions and exerting damping in the finite element model were presented,the calculated dynamic wheel-rail force based on the in-situ vibration measurement on the rails are applied in the model.The results showed that the vibration induced by passage of metro trains in tunnels can be effectively predicted using the dynamic finite element model;the floating slab track is an effective vibration mitigation measure,it can efficiently reduce vibration in its work frequency range;however,the floating slab track cannot reduce vibration at lower frequencies,and has a certain action of amplifying vibration at its natural frequencies;the combined vibration due to road traffic and metro traffic affects a few sensitive instruments after starting the metro line 8,it can be reduced with passive isolation measures under the bases of equipments.
引文
[1]Wolf S.Potential low frequency ground vibration(<6.3Hz)impacts from underground LRT operations[J].Journal ofSound and Vibration,2003,267(3):651-663.
[2]Fraser M.Dublin metro north:baseline vibration monitoringreport[R].Environmental resources managementlimited,2008.
[3]刘卫丰.地铁列车运行引起的隧道及自由场动力响应数值预测模型研究[D].北京:北京交通大学,2009.
[4]Liu W F,Gupta S,Degrande G,et al.Numerical modeling ofvibrations induced by underground railway traffic on metroline 4 in Beijing[R].Bilateral Project BIL/04/17,ReportBWM-2006-11,K.U.Leuven,Belgium and BeijingJiaotong University,China,2006.
[5]Gupta S,Liu W F,Degrande G,et al.Prediction ofvibrations induced by underground railway traffic in Beijing[J].Journal of Sound and Vibration,2008,310:608-630.
[6]Ding D Y,Gupta S,Lombaert G,et al.The prediction ofvibrations induced by underground railway traffic on line 8 ofBeijing metro[R].Bilateral Project BIL/07/07,ReportBWM-2008-22,K.U.Leuven,Belgium and BeijingJiaotong University,China,2008.
[7]Ding D Y,Gupta S,Lombaert G,et al.The prediction ofvibrations due to underground railway traffic on line 15 ofBeijing metro[R].Bilateral Project BIL/07/07,ReportBWM-2009-25,K.U.Leuven,Belgium and BeijingJiaotong University,China,2008.
[8]廖振鹏.近场波动问题的有限元解法[J].地震工程与工程振动,1984,4(2):1-14.LIAO Zhen-peng.Finite element analysis method for nearfield wave problem[J].Earthquake Engineering andEngineering Vibration,1984,4(2):1-14.
[9]刘晶波,廖振鹏.离散网格中的弹性波动(Ⅱ)[J].地震工程与工程振动,1989,9(2):38-50.LIU Jing-bo,LIAO Zhen-peng.Elastic wave in the discretemesh(II)[J].Earthquake Engineering and EngineeringVibration,1989,9(2):38-50.
[10]刘晶波,谷音,杜义欣.一致粘弹性人工边界单元及粘弹性边界单元.岩土工程学报,2006,28(9):1070-1075.LIU Jing-bo,GU Yin,DU Yi-xin.Consistent viscous-springartificial boundaries and viscous-spring boundary elements[J].Journal of Geotechnical Engineering,2006,28(9):1070-1075.
[11]夏禾.交通环境振动工程[M].北京:科学出版社,2010.
[2]Fraser M.Dublin metro north:baseline vibration monitoringreport[R].Environmental resources managementlimited,2008.
[3]刘卫丰.地铁列车运行引起的隧道及自由场动力响应数值预测模型研究[D].北京:北京交通大学,2009.
[4]Liu W F,Gupta S,Degrande G,et al.Numerical modeling ofvibrations induced by underground railway traffic on metroline 4 in Beijing[R].Bilateral Project BIL/04/17,ReportBWM-2006-11,K.U.Leuven,Belgium and BeijingJiaotong University,China,2006.
[5]Gupta S,Liu W F,Degrande G,et al.Prediction ofvibrations induced by underground railway traffic in Beijing[J].Journal of Sound and Vibration,2008,310:608-630.
[6]Ding D Y,Gupta S,Lombaert G,et al.The prediction ofvibrations induced by underground railway traffic on line 8 ofBeijing metro[R].Bilateral Project BIL/07/07,ReportBWM-2008-22,K.U.Leuven,Belgium and BeijingJiaotong University,China,2008.
[7]Ding D Y,Gupta S,Lombaert G,et al.The prediction ofvibrations due to underground railway traffic on line 15 ofBeijing metro[R].Bilateral Project BIL/07/07,ReportBWM-2009-25,K.U.Leuven,Belgium and BeijingJiaotong University,China,2008.
[8]廖振鹏.近场波动问题的有限元解法[J].地震工程与工程振动,1984,4(2):1-14.LIAO Zhen-peng.Finite element analysis method for nearfield wave problem[J].Earthquake Engineering andEngineering Vibration,1984,4(2):1-14.
[9]刘晶波,廖振鹏.离散网格中的弹性波动(Ⅱ)[J].地震工程与工程振动,1989,9(2):38-50.LIU Jing-bo,LIAO Zhen-peng.Elastic wave in the discretemesh(II)[J].Earthquake Engineering and EngineeringVibration,1989,9(2):38-50.
[10]刘晶波,谷音,杜义欣.一致粘弹性人工边界单元及粘弹性边界单元.岩土工程学报,2006,28(9):1070-1075.LIU Jing-bo,GU Yin,DU Yi-xin.Consistent viscous-springartificial boundaries and viscous-spring boundary elements[J].Journal of Geotechnical Engineering,2006,28(9):1070-1075.
[11]夏禾.交通环境振动工程[M].北京:科学出版社,2010.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心