快速高架复合道路近场交通噪声垂向分布

Vertical sound field on traffic noise from elevated complex road

采用Cadna/A环境噪声模拟软件建立了高架复合道路的基本模型,根据6种基本模拟情况进行了声场模拟,并把模拟结果与实测结果进行对比分析。结果表明,高架道路结构本身对地面道路、高架道路分别形成的声场有明显的遮挡作用,但对高架复合道路所形成的声场遮挡作用不明显;对于高架复合道路垂向声场,在低层段地面道路的影响大于高架道路,而在高层段高架道路的影响起决定作用;高架复合道路较地面道路的垂向声场最大值增加2.5 dB(A),位置上移6m;在高架道路上设置声屏障有一定降噪效果,但在高架复合道路的上层设置声屏障降噪效果不理想。

The model of the elevated complex road was established by using Cadna/A environmental noise simulation software. We simulated six basic situations of sound fields, and compared the simulation results with the measured ones. Results show that the structure of high road has obvious blocking effect on itself and the ground road,but little blocking effect is found on the elevated complex road. In lower vertical sound field, the ground road has greater effect than the elevated road,but in higher sound field,the elevated road palys a greater role. For elevated complex road,the maximum sound pressure level increases 2.5dB （A） and its position moves up by 6 m. The sound barrier built on the elevated road has the effect of noise reduction in some degree,but for the elevated complex road, the effect is limited.