山地城市隧道交通噪声分布特性实测

为了得到山地城市隧道内外汽车行驶噪声的幅值水平、分布特性和影响因素,在重庆市主城区的6条隧道采集汽车行驶噪声值,分析交通噪声沿隧道纵向的整体分布特性、洞口变化规律、车流量及振动减速标线等因素对隧道交通噪声的影响。结果表明:交通整体噪声幅值在隧道内部明显高于隧道外部,呈中间高两侧低的分布特性;交通噪声水平在隧道洞口内外存在明显差异,由隧道外至隧道内,噪声有明显提高,尤其是在距离洞口20 m开始迅速提高;隧道内外噪声水平会因车辆经过而增高,且隧道内的噪声提高明显高于隧道外,噪声值在隧道洞口处显著增加;另外,振动减速标线在一定程度上会小幅提高隧道内的噪声水平。

Field Investigation of Traffic Noise Distribution along Mountainous Urban Tunnels

To clarity the magnitude, distribution and influence factors of automobile noise along urban tunnels in mountainous cities, noise values were measured from six tunnels located in urban areas of Chongqing, China. The distribution characteristics of traffic noise along the driving direction of the selected tunnel and changing characteristic of traffic noise at tunnel portals were analyzed, as well as the effect of traffic flow and rumble markings on the traffic noise along the tunnel. The results show that the traffic noise amplitude measured inside the tunnel is significantly higher than that measured outside the tunnel, and the profiles of traffic noise are featured by high intermediate and low at two ends. Traffic noise changes significantly at tunnel portals, and the noise value obviously increases when the observation points is approaching to the tunnel portal, especially it increases rapidly at the location of 20m away from the tunnel entrance. The noise level inside and outside the tunnel will increase due to the passing vehicles, and the noise level inside the tunnel is obviously higher than that outside the tunnel. Moreover, noise value is more significant at tunnel entrance, and the rumble markings can slightly improve the noise level in the tunnel to a certain extent.