城市轨道交通高架段直立式声屏障降噪效果测试与分析
王东方1徐鸿2尹镪2张斌3
Noise Reduction Effect Testing and Analysis of Vertical Sound Barriers in Elevated Urban Rail Transit Sections
WANG Dongfang1XU Hong2YIN Qiang2ZHANG Bin3
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作者信息:1.宁波市轨道交通集团有限公司，315101，宁波
2.中铁二院工程集团有限责任公司，610031，成都
3.华东交通大学轨道交通基础设施性能监测与保障国家重点实验室，330013，南昌
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Affiliation:1.Ningbo Rail Transit Group Co., Ltd., 315101, Ningbo, China
2.China Railway Eryuan Engineering Group Co., Ltd., 610031, Chengdu, China
3.State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure, East China Jiaotong University, 330013, Nanchang, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2025.03.047
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中图分类号/CLCN:U214.5
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栏目/Col:应用技术
摘要:
［目的］声屏障在城市轨道交通高架段普遍使用，但对其在运营状态下的实际降噪效果研究还极其有限，需对实际运营中的直立式声屏障的降噪效果以及相关的噪声分布特征规律进行研究。［方法］以宁波轨道交通1号线声屏障为工程背景，分别在2m、3m、4m高直立式声屏障不同高度处布置测点，监测列车通过测点时的噪声，并对各测点的声压级频谱、插入损失等声学特性进行分析。［结果及结论］列车运行产生的噪声能量分布频带较宽，源强点附近的噪声主频在500~800Hz之间，声屏障声影区内，测点位置越低，声屏障降噪效果越好；声屏障对高频噪声的降噪效果优于低频噪声；2m、3m和4m高直立式声屏障距轨道中心线7.5m处声影区噪声平均降低值分别为4.0dB(A)、6.7dB(A)和11.1dB(A)。
Abstracts:
［Objective］ Sound barriers are widely used in elevated sections of urban rail transit. However, studies on their actual noise reduction performance during operation remain limited. Therefore, it is necessary to investigate the noise reduction effectiveness of vertical noise barriers in real operation conditions and analyze the characteristics and distribution patterns of noise. ［Method］ Using the sound barriers of Ningbo Rail Transit Line 1 as the engineering background, measuring points are placed at different heights (2 m, 3 m, and 4 m) on vertical sound barriers. Noise levels are monitored as trains passing these points, and the acoustic characteristics such as sound pressure level spectrum and insertion loss are analyzed. ［Result & Conclusion］ The noise energy generated by train operation is distributed over a broad frequency range, with dominant frequencies between 500 Hz and 800 Hz near the primary noise sources. Within the acoustic shadow zone of the sound barriers, lower measurement points exhibit better noise reduction effects. The sound barriers are more effective at attenuating high-frequency noise than low-frequency noise. At a distance of 7.5 m from the track centerline, the average noise reduction values in the acoustic shadow zone for 2 m, 3 m, and 4 m high vertical sound barriers are 4.0 dB (A), 6.7 dB(A), and 11.1 dB(A), respectively.
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