市域快速轨道交通高架桥降噪效果实测分析
卢生安林海锋
Measured Analysis of Noise Reduction Effect for Urban Rapid Rail Transit Viaducts
LU Sheng’anLIN Haifeng
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作者信息:温州市铁路与轨道交通投资集团有限公司，325029，温州
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Affiliation:Wenzhou Mass Transit Railway Investment Group Co., Ltd., 325029, Wenzhou, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.01.014
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中图分类号/CLCN:U270.1+6∶U239.5
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栏目/Col:研究报告
摘要:
［目的］为了降低市域快速轨道交通高架线路对环境噪声的影响，实施了包括近轨声屏障与道床吸音板在内的多种降噪措施，需结合实际运营环境进行实测与分析，以此来验证轨旁降噪措施在减轻环境噪声方面的效果。［方法］以温州市域快速轨道交通已开通的S1线为例，对该线路的高架桥地段进行环境噪声实测，对比分析了不同列车运行速度条件下，使用近轨声屏障和道床吸音板对环境噪声的降低效果，探究不同降噪措施对高架噪声的影响特征。［结果及结论］近轨声屏障使得高架桥内外侧的最大瞬时A计权时域声压级降低约为20~21dB(A)，其中距离轨道中心线7.5m，轨面以上7.5m的位置，500Hz和800~1000Hz频段的A计权频域声压级分别降低6~11dB(A)和17~21dB(A)。道床吸音板能进一步降低高架桥上轨旁噪声和高架桥外噪声，与仅安装近轨声屏障的工况相比，相同列车运行速度下高架桥上最大瞬时A计权时域声压级又降低了14~17dB(A)；高架桥外上述同一测点处500Hz和800~1000Hz频段的噪声，采用道床吸音板措施后使得A计权频域声压级分别降低7~8dB(A)和5~7dB(A)。
Abstracts:
［Objective］ To reduce the impact of elevated lines in urban rapid rail transit on environmental noise, multiple noise-reduction measures such as near-track sound barriers and ballast bed sound-absorbing panels are adopted. On-site measurements and analyses should combine with on-site operating conditions to verify the effectiveness of trackside noise reduction measures in reducing environmental noise. ［Method］ In the case study of the already operating Line S1 of Wenzhou Urban Rapid Rail Transit, the environmental noise in the viaduct section of this line is measured on site. The noise reduction effects of near-track sound barriers and ballast bed sound-absorbing panels for the environmental noise under different train running speeds are compared and analyzed, and the influence characteristics of different noise reduction measures on the viaduct section noise are explored. ［Result & Conclusion］ The near-track sound barrier reduces the maximum instantaneous A-weighted time-domain sound pressure level (hereinafter abbreviated as “A-weighted level”) on the viaduct inner and outer sides by approximately 20 to 21 dB(A). At the position 7.5 meters away from the track center line and 7.5 meters above the rail surface, the A-weighted level in the 500 Hz and 800-1 000 Hz frequency bands are respectively reduced by 6 to 11 dB(A) and 17 to 21 dB(A). The ballast bed sound-absorbing panels can further reduce the trackside noise on and outside the viaduct. Compared with the working conditions where only the near-track sound barriers are installed, when using the sound-absorbing panels, the maximum instantaneous A-weighted level on the viaduct is further reduced by 14 to 17 dB(A) with the same train running speed, and the A-weighted level is reduced by 7 to 8 dB(A) and 5 to 7 dB(A) respectively for the noise in the 500 Hz and 800 - 1 000 Hz frequency bands at the same measuring point outside the viaduct.
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