公路隧道内降噪优化设计

Design optimization for reducing noise inside highway tunnels

为有效降低公路隧道内噪声污染,提高隧道内降噪设计的经济性,从声音传播途径角度进行公路隧道内降噪优化设计.在1∶10缩尺模型中对修正的相干模型和不相干模型理论预测值与实测值进行对比,表明修正的相干模型能准确地对长空间声场交通噪声进行预测.采用修正的相干模型对吸声材料的多种布设方式、布设位置和布设数量进行研究,结果表明:长空间降噪设计中需连续铺设吸声材料,但铺设的位置不受限制;在地面和某一侧边墙连续布设70%长度的吸声材料即可达到较好的降噪效果,而无须在100%范围内布设.研究结果对提高公路隧道内的吸音降噪效果和节约建筑材料提供了理论基础.

In order to effectively reduce noise pollution in highway tunnels and improve the economic effect of noise reduction,design optimization for reducing noise is studied from the angle of sound transmission route.The comparison between the measurement and the prediction of the modified coherent model and the incoherent model is carried out in a scale model of one tenth,and the results indicate that the modified coherent model can accurately predict the traffic noise transmission in long enclosure.Researches on different patterns,locations and amounts of the absorption materials indicate that continuous collocation absorption materials in long enclosure are required but the location is unrestricted.An amount of 70% coverage,instead of 100%,along the ground and one of the vertical wall is enough to achieve preferable effect.The research provides a theoretical basis for improving noise reduction effect and saving construction materials inside highway tunnels.