重庆地铁各型声屏障综合降噪效果研究  

Study on Comprehensive Noise Reduction Effect of Various Types of Noise Barriers in Chongqing Metro

作　　者：张书豪 刘剑梅 吴姣姣 钟姗 贺玉龙 ZHANG Shuhao;LIU Jianmei;WU Jaojiao;ZHONG Shan;HE Yulong(CISDI Chongqing Environmental Consult Co.,Ltd.,Chongqing 401120,China;Faculty of Geoscience and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]中冶赛迪重庆环境咨询有限公司,重庆401120 [2]西南交通大学地球科学与环境工程学院,成都611756

出　　处：《噪声与振动控制》2024年第4期252-257,共6页Noise and Vibration Control

摘　　要：通过在重庆地铁各型声屏障的实际设置区段,对距外轨中心线7.5 m处的近轨声场和敏感建筑处进行同步噪声测试,分析数据并建立符合实际的重庆地铁声屏障降噪效果预测模型,并通过实测和模拟的方法研究重庆地铁各型声屏障的综合降噪效果。结果表明:对敏感建筑整体降噪效果最好的为顶部设置消声百叶的全封闭声屏障,敏感建筑处的噪声为56.4~61.1 dB(A),整体降噪效果最差的为2.5 m直立式声屏障,敏感建筑处的噪声为67.8~73.2 dB(A);使用单一线声源模式模拟全封闭声屏障降噪结果与实测误差较大,需在模型中通过添加结构噪声源等方式进行修正;利用修正后的预测模型,预测得出的降噪效果与实测结果具有较好的吻合性,各型声屏障中对近轨声场以及敏感建筑处降噪效果均最好的为顶部设置消声百叶的全封闭声屏障,实测降噪效果为4.9~15.9 dB(A),模拟得出降噪效果为7.7~17.1 dB(A)。Synchronous noise test is carried out on the near-track sound field 7.5 m away from the center line of outer rail and the sensitive building in the actual section of various sound barriers in Chongqing metro.The data are analyzed and the prediction model for analyzing noise reduction effect of sound barriers in Chongqing Metro is established,and the comprehensive noise reduction effect of various sound barriers in Chongqing Metro is studied through measurement and simulation.The results show that the anechoic louvered fully enclosed sound barrier has the best overall noise reduction effect,and the corresponding overall noise at the sensitive point of sensitive buildings is 56.4-61.1 dB(A);the 2.5 m upright sound barrier has quite poor overall noise reduction effect,and the corresponding overall noise at the sensitive point of sensitive buildings is 67.8-73.2 dB(A).Another finding is that the simulation result with the use of a single line source model in the case of fully enclosed sound barrier has a larger error in comparison with the actual measurement data,which needs to be corrected by adding a structural noise source and so on.Using the modified prediction model,the predicted noise reduction results are in good agreement with the measured results.Among various sound barriers,the best noise reduction effect for near-track sound field and sensitive buildings is from the fully enclosed sound barrier with muffler louvers at the top,and the measured and the simulated noise reduction effects are 4.9-15.9 dB(A)and 7.7-17.1 dB(A)respectively.

关 键 词：声学 地铁噪声 声屏障 消声百叶 降噪效果 

分 类 号：X593[环境科学与工程—环境工程]