双线地铁运营隔振沟屏障性能研究
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摘要
为研究双线地铁运营时隔振沟的减振效果,基于2.5维有限元法建立双线地铁列车-轨道-地基土体耦合分析模型。模型克服现有研究将轨道结构简化为弹性地基欧拉梁的缺陷,引入实际钢轨动力学参数,实现双线地铁列车荷载下隔振沟对周围地基的隔振效果分析,比较空沟、填充沟两种不同隔振措施的减振特性,并对填充沟隔振影响因素进行系统的参数分析。研究结果表明:双线运营地铁荷载下,空沟隔振作用体现在沟后范围内,填充沟减振范围更广且效果更好,相比空沟更具工程实用性;填充沟在沟深较小时也能发挥良好的减振作用,增大沟深、沟宽均可有效提高减振效果。研究成果可为今后双线地铁隔振设计与施工提供有益参考。
A coupled model of a double-line subway train-track-foundation soil was established on the basis of 2.5 D FEM to study the vibration isolation effect of the isolation trench during double-line subway operation.The model addresses the problems introduced by the simplification of track structures into an Euler beam on an elastic foundation and introduces the dynamic parameters of the actual rail.The model was used to analyze the vibration isolation effect of the isolation trench on the surrounding foundation under double-line subway train load.The vibration damping characteristics of open and in-filled trenches were compared, and the trench factors that influence isolation were systematically analyzed.Results showed that under the double-line subway load, the in-filled trench had better isolation and engineering practicality than the open trench.The in-filled trench can exert a good damping effect even with a reduced ditch depth.In addition, the isolation effect can be improved by increasing the depth and width of the in-filled trench.The results of the present work can provide useful reference for the vibration isolation design and construction of double-line subways in the future.
A coupled model of a double-line subway train-track-foundation soil was established on the basis of 2.5 D FEM to study the vibration isolation effect of the isolation trench during double-line subway operation.The model addresses the problems introduced by the simplification of track structures into an Euler beam on an elastic foundation and introduces the dynamic parameters of the actual rail.The model was used to analyze the vibration isolation effect of the isolation trench on the surrounding foundation under double-line subway train load.The vibration damping characteristics of open and in-filled trenches were compared, and the trench factors that influence isolation were systematically analyzed.Results showed that under the double-line subway load, the in-filled trench had better isolation and engineering practicality than the open trench.The in-filled trench can exert a good damping effect even with a reduced ditch depth.In addition, the isolation effect can be improved by increasing the depth and width of the in-filled trench.The results of the present work can provide useful reference for the vibration isolation design and construction of double-line subways in the future.
引文
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[13] EASON G.The Stresses Produced in a Semi-infinite Solid by a Moving Surface Force[J].International Journal of Engineering Sciences,1965,2(6):581-609.
[14] 边学成.高速列车运动荷载作用下地基和隧道的动力响应分析[D].杭州:浙江大学,2005.BIAN Xuecheng.Dynamic Analyses of Ground and Tunnel Responses due to High-speed Train Moving Loads[D].Hangzhou:Zhejiang University,2005.
[15] WOODS R D.Screening of Surface Waves in Soils[J].Journal of the Soil Mechanics and Foundations Division,American Society of Civil Engineering,1968,94(4):951-979.
[16] BARBOSA J,ALVES COSTA P,CAL?ADA R.Abatement of Railway Induced Vibrations:Numerical Comparison of Trench Solutions[J].Engineering Analysis with Boundary Elements,2015,55:122-139.
[2] 丁智,李丹薇,魏新江.基于2.5维有限元方法的列车振动及隔振研究与展望[J].现代隧道技术,2016,53(6):1-11.DING Zhi,LI Danwei,WEI Xinjiang.Studies and Prospects of Train Vibration and Vibration Isolation Based on 2.5D Finite-Element Method[J].Modern Tunnelling Technology,2016,53(6):1-11.
[3] 耿传智,王伟鹏.地铁弹性扣件减振性能的落轴冲击仿真分析[J].振动与冲击,2010,29(3):113-117.GENG Chuanzhi,WANG Weipeng.Simulation on Vibration-Reduction Performance of Different Subway Elastic Fasteners under Wheel Load Drop[J].Journal of Vibration and Shock,2010,29(3):113-117.
[4] 涂勤明,雷晓燕,毛顺茂.地铁产生的环境振动及轨道结构减振分析[J].噪声与振动控制,2014,34(4):178-183.TU Qinming,LEI Xiaoyan,MAO Shunmao.Analyses of Subway Induced Environment Vibration and Vibration Reduction of Rail Track Structure[J].Noise and Vibration Control,2014,34(4):178-183.
[5] 张莉,刘鹏辉,杨宜谦,等.杭州地铁1号线浮置板轨道减振效果对比分析[J].铁道建筑,2013(10):80-83.ZHANG Li,LIU Penghui,YANG Yiqian,et al.Analysis of Floating Slab Track Vibration Damping Effect by Hangzhou Metro Line 1[J].Railway Engineering,2013(10):80-83.
[6] 丁智,王永安,顾晓卫,等.软土区地铁不同类型轨道振动测试分析[J].岩土工程学报,2017,39(增刊2):220-223.DING Zhi,WANG Yongan,GU Xiaowei,et al.Vibration of Different Types of Tracks of Subway in Soft Soil[J].Chinese Journal of Geotechnical Engineering,2017,39(Supp2):220-223.
[7] 袁宗浩,蔡袁强,曾晨.地铁列车荷载作用下轨道系统及饱和土体动力响应分析[J].岩石力学与工程学报,2015,34(7):1470-1479.YUAN Zonghao,CAI Yuanqiang,ZENG Chen.Dynamic Response of Track System and Underground Railway Tunnel in Saturated Soil Subjected to Moving Train Loads[J].Chinese Journal of Rock Mechanics and Engineering,2015,34(7):1470-1479.
[8] 陈功奇,高广运.层状地基中填充沟对不平顺列车动荷载的隔振效果研究[J].岩石力学与工程学报,2014,33(1):144-153.CHEN Gongqi,GAO Guangyun.Vibration Screening Effect of In-filled Trenches on Train Dynamic Loads of Geometric Irregular Track in Layered Grounds[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(1):144-153.
[9] 高广运,何俊锋,李宁,等.饱和地基上列车运行引起的地面振动隔振分析[J].岩土力学,2011,32(7):2191-2198.GAO Guangyun,HE Junfeng,LI Ning,et al.Analysis of Isolating Ground Vibration Induced by Trains Running on Saturated Ground[J].Rock and Soil Mechanics,2011,32(7):2191-2198.
[10] THOMPSON D J,JIANG J,TOWARD M G R,et al.Mitigation of Railway-induced Vibration by Using Subgrade Stiffening[J].Soil Dynamics and Earthquake Engineering,2015,79:89-103.
[11] 边学成,陈云敏.基于2.5 维有限元方法分析列车荷载产生的地基波动[J].岩石力学与工程学报,2006,25(11):2335-2342.BIAN Xuecheng,CHEN Yunmin.Ground Vibration Generated by Train Moving Loadings Using 2.5D Finite Element Method[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(11):2335-2342.
[12] 边学成,陈云敏,胡婷.基于2.5 维有限元方法模拟高速列车产生的地基振动[J].中国科学G辑:物理学力学天文学,2008,38(5):600-617.BIAN Xuecheng,CHEN Yunmin,HU Ting.Numerical Simulation of High-speed Train Induced Ground Vibrations Using 2.5D Finite Element Approach[J].Science in China Series G:Physics,Mechanics and Astronomy,2008,38(5):600-617.
[13] EASON G.The Stresses Produced in a Semi-infinite Solid by a Moving Surface Force[J].International Journal of Engineering Sciences,1965,2(6):581-609.
[14] 边学成.高速列车运动荷载作用下地基和隧道的动力响应分析[D].杭州:浙江大学,2005.BIAN Xuecheng.Dynamic Analyses of Ground and Tunnel Responses due to High-speed Train Moving Loads[D].Hangzhou:Zhejiang University,2005.
[15] WOODS R D.Screening of Surface Waves in Soils[J].Journal of the Soil Mechanics and Foundations Division,American Society of Civil Engineering,1968,94(4):951-979.
[16] BARBOSA J,ALVES COSTA P,CAL?ADA R.Abatement of Railway Induced Vibrations:Numerical Comparison of Trench Solutions[J].Engineering Analysis with Boundary Elements,2015,55:122-139.