某城市地铁典型线路地下站台噪声现状分析

为研究某城市地铁地下站台噪声现状及特点，选取某城市地铁某3条线路的T站、W站、N站、H站、S站、C站、P站和F站8个地下站台进行测量，并对噪声测量结果进行分析。结果显示: 完全封闭安全门和无安全门比较站台噪声LAeq减小7dB左右；半封闭安全门与无安全门比较站台噪声LAeq减少4dB左右；全封闭安全门与半封闭安全门比较站台噪声LAeq减小3dB左右。在站台中间位置测量进出站声值基本相同。在站台车尾和车头位置测量，进出站声值不同。列车在整个进站过程中，车尾位置测点测量LAeq声值最大，列车在整个出站过程中，车头位置测点测量LAeq声值最大。同时对车站背景噪声来源进行了初步分析，并提出降低站台本底噪声的建议。

Analysis on noise status of underground platform in a typical line of urban metro

In order to study the status and characteristics of noise in underground platform of urban metro, eight underground platforms in three metro lines, the T platform ,the W platform, the N platform ,the H platform ,the S platform ,the C platform，the P platform and the F platform were selected, and the noise data were measured and analyzed. The results showed that the LAeq is reduced by 7dB with totally enclosed safety door than that without safety door, the LAeq is reduced by 4dB with half enclosed safety door than that without safety door, and the LAeq is reduced by 3dB with totally enclosed safety door than that with half enclosed safety door. When train is coming in or going out, the noise levels in the middle of the platform are the same, and the noise levels measured in the train head and train tail positions on the platform are different. The LAeq measured in the train tail position is the maximum when the train is coming in, and The LAeq measured in the train head position is the maximum when the train is going out. The sources of background noise on the platform was preliminarily analyzed, and the suggestions to reduce background noise of the platform were put forward.