地铁列车不同轨道参数的减振效果分析
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摘要
地铁在市区建筑物群中穿过 ,列车运行时产生的振动会通过行车轨道系统传递给隧道结构 ,再经隧道结构传播到周边的围岩介质 ,最后影响到沿线建筑的基础 ,产生局部区域振动。区域振动直接影响到地面建筑物和沿线地下管线的使用安全 ;同时 ,地下振动使人烦躁不安 ,直接影响人们的生产和生活 ,为此 ,对地铁列车运行振动进行研究是很有必要的。笔者基于数值分析方法 ,用适合岩土工程数值模拟的FLAC程序 ,分析了不同轨道参数对地铁诱发振动的衰减作用并得出了以下结论 :(1)钢轨支座弹性系数对振动的衰减有直接的影响 ;(2 )钢轨支座弹性系数减小 ,将导致地面振动的强度减小 ;(3)地面振动的衰减在水平方向和竖直方向均较为明显。
Vibration caused by sub-way when crossing downtown propagates through rail-system to tunnel-structure and surrounding rocks, and finally to the foundation of buildings and pipelines underground along the subway producing regional vibration, which has direct impact on the safety of buildings and pipelines. The necessity to study the vibration caused by running subway is clearly seen. Based on numerical analysis, damping effects of different track parameters are analyzed by FLAC program, and the following conclusions are drawn. ① Elastic coefficient of rail supporter has direct effect on vibration damping. ② The less the elastic coefficient of rail supporter, the less the intensity of ground vibration. ③ The damping of ground vibration is evident both in horizontal and vertical direction.
Vibration caused by sub-way when crossing downtown propagates through rail-system to tunnel-structure and surrounding rocks, and finally to the foundation of buildings and pipelines underground along the subway producing regional vibration, which has direct impact on the safety of buildings and pipelines. The necessity to study the vibration caused by running subway is clearly seen. Based on numerical analysis, damping effects of different track parameters are analyzed by FLAC program, and the following conclusions are drawn. ① Elastic coefficient of rail supporter has direct effect on vibration damping. ② The less the elastic coefficient of rail supporter, the less the intensity of ground vibration. ③ The damping of ground vibration is evident both in horizontal and vertical direction.
引文
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2 王泳嘉,刑纪波.离散单元法同拉格朗日元法及其在岩土力学中的应用.岩土力学,1995,16(2):1～14
3 崔培新.地铁列车振动异常问题探讨.铁道车辆,2001,39(12):18～21
4 陶连金,李晓霖,陆熙,张丁盛.地铁诱发地面运动的衰减规律的研究.世界地震工程,2002,19(1):83～87
5 孙家麒主编.城市轨道交通振动和噪声控制.北京:中国科学技术出版社,2002:2～3
6 周才宝.地下铁道整体轨下基础.地铁与轻轨,1994(2):29～31
7 王杰贤.动力地基与基础.北京:科学出版社,2001:229,236,239
8 高广运,王贻荪,杨先健.弹性半空间非连续屏障的屏蔽分析.全国首届结构与介质相互作用学术论文集.上海:同济大学出版社,1993
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