Through the test, it is found that the longitudinal attenuation rates of different pavements in the tunnel are as shown in Figure 4.7, and there are significant differences among the three pavements. The longitudinal attenuation rate of dense graded pavement is 0.076dB/m, that of single-layer drainage noise-reducing pavement is 0.100dB/m, and that of double-layer drainage noise-reducing pavement is 0.1316 dB/m.. It is concluded that in the same tunnel environment, the longitudinal attenuation rate of noise of dense graded pavement is the smallest, that of double-layer drainage and noise reduction pavement is the largest, and that of single-layer drainage and noise reduction pavement is in the middle. Therefore, the drainage noise reduction pavement can effectively improve the longitudinal attenuation rate of noise, so as to reduce tunnel noise and improve tunnel acoustic environment.
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