高速铁路隔振沟隔振效果的现场测试与分析
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摘要
对沪宁城际铁路高架桥段旁一条为农业灌溉而挖的沟渠在CRH动车组运行时引起的地面振动隔振效果进行了测试与分析。结果表明:随着列车车速的降低,引起的地面竖向振动速度峰值变小、地面竖向振动主频变高;沟渠对地面振动具有低通滤波作用;车速越慢,隔振效果越好,但沟前地面振动变大的现象也越明显;当沟的长度远大于列车长度时,列车车厢数量对沟的隔振效果影响不大。建议修建铁路时,加强与当地居民及农业部门的协调,对沟的长度、深度、宽度以及离轨道的距离进行合理的设计,使沟渠除了满足农业灌溉的需要外,也能起到很好的隔振效果。
One trench for agricultural irrigation next to the Hu-Ning Intercity Railway viaduct section were tested and analyzed in order to achieve the effect of ground vibration isolation when CRH trains run on.The result shows that with decrease of train speed,the peak value of ground vibration velocity decreases and the main frequency of ground vibration heightens.The trench has lowpass filtering effect on ground surface vibration.The slower the train speed,the more apparent the effect of isolation,but the phenomenon that ground surface vibration increases before trench is more remarkable.When the length of trench is much greater than the length of train,the number of carriages has little effect on vibration isolation effect of the trench.When the railways are built,the department concerned should facilitate the coordination with nearby residents and department of agriculture,and the trench's length,depth,breadth and the distance to railway should be designed reasonably.And then the trench in addition to meet the need of irrigation,but also has marked effect on vibration isolation.
One trench for agricultural irrigation next to the Hu-Ning Intercity Railway viaduct section were tested and analyzed in order to achieve the effect of ground vibration isolation when CRH trains run on.The result shows that with decrease of train speed,the peak value of ground vibration velocity decreases and the main frequency of ground vibration heightens.The trench has lowpass filtering effect on ground surface vibration.The slower the train speed,the more apparent the effect of isolation,but the phenomenon that ground surface vibration increases before trench is more remarkable.When the length of trench is much greater than the length of train,the number of carriages has little effect on vibration isolation effect of the trench.When the railways are built,the department concerned should facilitate the coordination with nearby residents and department of agriculture,and the trench's length,depth,breadth and the distance to railway should be designed reasonably.And then the trench in addition to meet the need of irrigation,but also has marked effect on vibration isolation.
引文
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[2]高广运,彭争光,李伟,等.三维层状地基空沟主动隔振分析[J].西北地震学报,2006,28(3):210-215.Gao G Y,Peng Zh G,Li W,et al.3D analysis ofactive vibration isolation by open trench in layeredground[J].Northwestern Seismological Journal,2006,28(3):210-215.
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[4]刘奉喜,刘建坤,防建宏,等.多年冻土区铁路隔振沟隔振效果的数值分析[J].中国铁道科学,2003,24(5):48-51.Liu F X,Liu J K,Fang J H,et al.Numericalanalysis of the vibration isolation effect of the railwayvibration isolating cutting in permafrost[J].ChinaRailway Science,2003,24(5):48-51.
[5]罗锟,雷晓燕.新型铁路沟屏障隔振数值分析[J].噪声与振动控制,2010,(1):67-71.Luo K,Lei X Y.Numerical analysis of railwayvibration isolation of new style trenches[J].Journalof Sound and Vibration,2010,(1):67-71.
[6]赵荣欣,谢永利,章勇,等.泡沫塑料-水泥土充填沟隔振性状研究[J].西安公路交通大学学报,1998,18(1):38-42Zhao R X,Xie Y L,Zhang Y,et al.Behavioranalysis of isolation trenches filled by foamed plastic&cement clay[J].Journal of Xi’an HighwayUniversity,1998,18(1):38-42.
[7]Yao J B,Xia H,Chen J G.Study on isolationmeasures of building vibrations under train action[C]∥Environmental Vibrations:Prediction,Monitoring,Mitigation and Evaluation.Beijing:Science Press,2009.313-318.
[8]Takemiya H.Field tests of pca-wib with tire shredsfill-in for vibration mitigation[C]∥EnvironmentalVibrations:Prediction,Monitoring,Mitigation andEvaluation.Beijing:Science Press,2009.254-259.
[9]陈斌,陈国兴,朱定华,等.轨道交通运行引起的场地振动试验研究[J].防灾减灾工程学报,2007,27(3):312-317.Chen B,Chen G X,Zhu D H,et al.Experimentalstudy of ground vibration caused by rail transit[J].Journal of Disaster Prevention and Mitigation,2007,27(3):312-317.
[10]和振兴,翟婉明,杨新文,等.列车移动轴荷载作用下的地面振动及隔振研究[J].铁道科学与工程学报,2007,4(5):73-77.He Zh X,Zhai W M,Yang X W,et al.Moving trainaxle-load induced ground vibration and mitigation[J].Journal of Railway Science and Engineering,2007,4(5):73-77.
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