弹性支承块式无砟轨道减振特性足尺模型对比试验
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摘要
基于中铁五院弹性支承块式无砟轨道优化改进设计成果("改进型"LVT)以及蒙华铁路弹性支承块式无砟轨道("传统型"LVT)设计图纸,在实验室分别制作"改进型"和"传统型"LVT的1:1足尺试验模型,开展落轴冲击作用下,"改进型"和"传统型"LVT减振特性对比试验。研究结果表明:"改进型"和"传统型"LVT的钢轨加速度基本一致,而"改进型"LVT钢轨至支承块、底座板至地面的衰减率优于"传统型"LVT,"改进型"LVT减振效果可达4～5 dB;"改进型"LVT钢轨加速度第1和第2振动周期最大分别减少32.2%和30.0%,且第3周期加速度幅值不明显;"改进型"LVT整体弹性系数最大减小27.4%,而阻尼系数最大增大58.2%;"改进型"LVT支承块主要频率降低约6%,道床板、底座板以及地面主振频率降低约40%。试验结果可为"改进型"LVT的工程应用提供技术支撑。
Based on the present research results and design drawings of the low vibration track(LVT), the full-scale test models of the improved and traditional LVTs were established. A comparative experimental study on the vibration reduction characteristics of the improved and traditional LVTs was carried out under the impact action of drop axis. The results show that: The accelerations of the rails for improved and traditional LVTs are basically the same, while the attenuation rate from the rail to the support block as well as from the base plate to the ground of the improved LVT is better than that of the traditional LVT, and the damping effect of improved LVT can reach 4～5 dB; Compared with traditional LVT, the first and second vibration cycles of the rail acceleration of improved LVT decrease by 32.2% and 30.0%, respectively, and the amplitude of the third period acceleration of improved LVT is not obvious; The maximum elastic modulus of the improved LVT model decreases by 27.4%, while the maximum damping coefficient increases by 58.2%; The main frequency of the improved support block is reduced by about 6%, while the main frequency of the ballast board, base board and ground is reduced by about 40%. The test results provide a technical support for the project application of improved LVT.
Based on the present research results and design drawings of the low vibration track(LVT), the full-scale test models of the improved and traditional LVTs were established. A comparative experimental study on the vibration reduction characteristics of the improved and traditional LVTs was carried out under the impact action of drop axis. The results show that: The accelerations of the rails for improved and traditional LVTs are basically the same, while the attenuation rate from the rail to the support block as well as from the base plate to the ground of the improved LVT is better than that of the traditional LVT, and the damping effect of improved LVT can reach 4～5 dB; Compared with traditional LVT, the first and second vibration cycles of the rail acceleration of improved LVT decrease by 32.2% and 30.0%, respectively, and the amplitude of the third period acceleration of improved LVT is not obvious; The maximum elastic modulus of the improved LVT model decreases by 27.4%, while the maximum damping coefficient increases by 58.2%; The main frequency of the improved support block is reduced by about 6%, while the main frequency of the ballast board, base board and ground is reduced by about 40%. The test results provide a technical support for the project application of improved LVT.
引文
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[2]WEI Wei,ZENG Zhiping,WU Bin,et al.Dynamic characteristics of railway subgrade under heavy haul train[J].Electronic Journal of Geotechnical Engineering,2017,22(1):209-232.
[3]戴公连,朱俊樸,闫斌.重载列车与既有铁路简支梁桥的适应性研究[J].铁道科学与工程学报,2014,11(2):7-13.DAI Gonglian,ZHU Junpu,YAN Bin.The adaptability research of heavy haul trains and existing railway simply-supported bridge[J].Journal of Railway Science and Engineering,2014,11(2):7-13.
[4]中铁第五勘察设计院集团有限公司.重载铁路隧道内弹性支承块式无砟轨道优化设计研究报告[R].北京:中铁第五勘察设计院集团有限公司,2017.China Railway Fifth Survey and Design Institute Group Co.,Ltd.Research report of optimum design of low vibration track in heavy haul railway tunnel[R].Beijing:China Railway Fifth Survey and Design Institute Group Co.,Ltd,2007.
[5]尤瑞林,王继军,杜香刚,等.重载铁路弹性支承块式无砟轨道轨距保持能力计算分析[J].铁道建筑,2015(3):110-114.YOU Ruilin,WANG Jijun,DU Xianggang,et al.Calculation analysis of gauge-keeping ability of elastic bearing block-type ballastless track on heavy haul railway[J].Railway Engineering,2015(3):110-114.
[6]徐锡江,蔡文峰,姚力.弹性支承块式无砟轨道支承块的合理埋深研究[J].高速铁路技术,2013(3):13-16.XU Xijiang,CAI Wenfeng,YAO Li.Study on rational buried depth of bearing block for elastic bearing block ballastless track[J].High Speed Railway Technology,2013(3):13-16.
[7]裴承杰,宋小林,吕天航.CRTSⅢ型无砟轨道基础结构冲击试验与数值分析[J].铁道科学与工程学报,2017,14(3):425-435.PEI Chengjie,SONG Xiaolin,LüTianhang.Full-scale model impacting experiments and numerical analysis on CRTS III ballastless track-subgrade system[J].Journal of Railway Science and Engineering,2017,14(3):425-435.
[8]朱剑月,练松良.弹性支承块轨道结构落轴冲击动力性能分析[J].中国铁道科学,2006,27(3):22-26.ZHU Jianyue,LIAN Songliang.Analysis on the dynamic characteristics of low vibration track by use of wheel load drop[J].China Railway Science,2006,27(3):22-26.
[9]LEI Xiaoyan,ZHANG Bin.Analysis of dynamic behavior for slab track of high-speed railway based on vehicle and track elements[J].Journal of Transportation Engineering,2011,137(4):227-240.
[10]蔡成标,徐鹏.弹性支承块式无砟轨道结构参数动力学优化设计[J].铁道学报,2011,33(1):69-75.CAI Chengbiao,XU Peng.Dynamic optimization design of the structural parameters of low vibration track[J].Journal of the China Railway Society,2011,33(1):69-75.
[11]ZHU Shengyang,CAI Chengbiao.Interface damage and its effect on vibrations of slab track under temperature and vehicle dynamic loads[J].International Journal of Non-Linear Mechanics,2014,58(1):222-232.
[12]吴斌,朱坤腾,曾志平,等.列车荷载作用下CRTSⅢ型板式无砟轨道力学特性试验研究[J].铁道科学与工程学报,2016,13(7):1229-1233.WU Bin,ZHU Kunteng,ZENG Zhiping,et al.Experimental study on the mechanical characteristics of CRTSⅢslab ballastless track under train load[J].Journal of Railway Science and Engineering,2016,13(7):1229-1233.