以遂渝铁路古家垭口隧道为研究对象,旨在研究时速200 km/h以下的隧道噪声特性.通过现场实测与结果分析,得到遂渝铁路CRH1A型和CRH1B型等两种不同类型的动车组列车通过古家垭口隧道洞口时的时域、频谱等噪声特性,并且发现列车进、出隧道导致的微气压波历时都约为50 s,波动周期约为1.7 s,频率主要在0.05 Hz~4 Hz,各测点最大声压级频率都在1.25 Hz.以列车通过时间段的等效声压级为评价量,总结其噪声衰减规律,对于今后开展环境影响评价工作具有一定的参考价值.
With the Gujiayakou tunnel of Sui-Yu railway as the object, the tunnel noise characteristics with the train traveling below 200 km/h were analyzed. After the in-situ measurement test and result analysis, the noise characteristics in time-domain and frequency-domain of the CRH1A and CRH1B type trains were obtained when they travelling through the entrance and exit of the Gujiayakou tunnel. It was found that the micro pressure wave caused by the travelling of the trains through tunnel can continue for about 50 s with fluctuation period about 1.7 s and the main frequency in 0.05 Hz-4 Hz range. The frequencies of the maximum sound pressure level are all 1.25 Hz at different measurement points. The noise attenuation low was summarized by using the equivalent sound pressure level as the index for evaluation. This work has a certain reference value for environmental impact assessment in future.