高架复合道路综合降噪措施对临街建筑降噪效果研究

Study on Noise Reduction Effect of Comprehensive Noise Reduction Measures of Elevated Roads on Adjacent Buildings

基于成都市二环高架复合道路临街建筑噪声垂向分布测试结果以及实验条件下的工程降噪措施降噪效果,采用Cadna/A软件模拟预测综合降噪措施对高架复合道路临街建筑的降噪效果。结果表明:纯电动公交对高架复合道路临街建筑的降噪效果仅为0~0.1 dB(A);OGFC路面主要降噪频段为交通噪声频段,对临街建筑的降噪效果不超过4.1 dB(A);等效高度3.5 m顶部弧形声屏障和等效高度1.5 m高透明折臂声屏障预测降噪效果分别为0~5.2dB(A)和0~2.5 dB(A),仅对声屏障声影区内的楼层有一定降噪效果,对低层和高层楼层降噪效果不明显;对声源和传播途径采用综合降噪措施后噪声水平依然较高时,可使用隔声窗保证临街建筑室内声环境质量。

The Cadna/A software is employed to study and predict the noise reduction effect of comprehensive noise reduction measures on buildings adjacent to the elevated complex roads. The prediction is based on the field measurement of the noise level of the buildings along the second ring elevated complex road in Chengdu, and the noise reduction performance of noise reduction measures under experimental conditions. Results show that the use of pure electric buses in the elevated complex road can only reduce the noise level of the street-facing buildings by 0-0.1 dB(A). While, the opengraded friction course(OGFC) pavement can mainly reduce the noise in traffic noise frequency band with a maximum noise reduction of 4.1 dB(A) for the street-facing buildings. Moreover, the curved top sound barrier with an equivalent height of3.5 m and the transparent folding arm sound barrier with an equivalent height of 1.5 m are predicted to reduce the floors noise within noise shadow zone only, with the noise reduction of 0-5.2 dB(A) and 0-2.5 dB(A), respectively. While these two types of sound barriers show little noise reduction effect on the lower and higher floors. Additionally, sound insulation windows can be used to ensure the indoor sound environment quality of the street-facing buildings when the noise level is still high after adopting the comprehensive noise reduction measures.