双块式浮置板轨道隔振器刚度及减振效果研究
沈山杉1禹雷2黄慧超2谷呈朋2
Stiffness and Vibration Reduction Performance of Double-block Floating Slab Track Vibration Isolators
SHEN Shanshan1YU Lei2HUANG Huichao2GU Chengpeng2
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作者信息:1.南京地铁建设有限责任公司， 210036， 南京
2.中铁工程设计咨询集团有限公司， 100055， 北京
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Affiliation:1.Nanjing Metro Construction Co., Ltd., 210036, Nanjing, China
2.China Railway Engineering Consulting Group Co., Ltd., 100055, Beijing, China
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关键词:
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Key words:
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DOI:10.16037/j.1007－869x.20230597
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中图分类号/CLCN:U213.2+41
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栏目/Col:土建工程
摘要:
［目的］为解决目前高等及特殊减振浮置板轨道中存在轨底坡保持精度差、施工精度不足等弊端，引入CRTS（中国铁路无砟轨道系统）双块式无砟轨道技术至浮置板轨道中，以提高城市轨道交通高等及特殊减振轨道结构的稳定性、平顺性及安全性，减少维修量，提高施工效率。［方法］建立车辆-双块式浮置板轨道竖向动力耦合模型，对合理的隔振器刚度和隔振器布置方案开展研究，并与整体道床轨道进行对比，分析其减振效果和振动传播规律。［结果及结论］两种隔振器布置方案下，不同隔振器刚度的稳定性和安全性指标均能很好地满足限值要求。提出隔振器刚度选取8 kN/mm，隔振器采取1.785 m与1.190 m间距交替布置的方案。双块式浮置板轨道拥有优异的隔振效率，采用双块式浮置板轨道后，隧道壁的振动加速度峰值比道床振动加速度峰值降低了90%。在隧道壁振动加速度频谱分析中，双块式浮置板轨道总体上能减小隧道壁在不同频率下的竖向振动加速度，最大Z振级的差值降幅可达18.3 dB。当距离隧道中心正上方超出70 m，城市区域环境振动控制标准均满足要求。
Abstracts:
［Objective］ To address the shortcomings currently present in high-performance and special vibration-reducing floating slab track systems, such as poor accuracy in maintaining the rail bottom gradient and insufficient construction precision, the CRTS (China railway track system) double-block ballastless track technology is introduced into floating slab track structures, to enhance the stability, smoothness, and safety of advanced and special vibration-reducing urban rail transit track structures, reduce maintenance demands, and improve construction efficiency. ［Method］ A vertical dynamic coupling model of the vehicle and double-block floating slab track system is established to investigate appropriate stiffness values and layout schemes for vibration isolators. Comparative analyses with monolithic track bed systems are conducted to evaluate the vibration reduction performance and vibration propagation characteristics. ［Result & Conclusion］ Under two different vibration isolator layout schemes, the stability and safety indicators corresponding to various isolator stiffness values effectively met the required limits. A vibration isolator of stiffness 8 kN/mm with the layout scheme involving alternating spacings of 1.785 m and 1.190 m is proposed. The double-block floating slab track system demonstrate excellent vibration isolation efficiency. When adopting this system, the peak vibration acceleration on the tunnel wall is reduced by 90% compared to that of the track bed. Spectral analysis of tunnel wall vibration acceleration shows that the double-block floating slab track system significantly reduce vertical vibration acceleration across various frequencies, with a maximum Z-vibration level reduction of up to 18.3 dB. At a distance of more than 70 meters vertically above the tunnel center, the environmental vibration levels in urban areas compiled with all regulatory standards.
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