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为了评价LOS声屏障在噪声水平超标较小与住户较少地区的应用效果,对美国印第安纳州I-465高速公路新型LOS声屏障试验段进行噪声测试与TNM分析,研究了路面类型、车辆速度、交通量、降噪系数、声屏障高度与声屏障延长对LOS声屏障降噪水平的影响,评价了LOS声屏障应用效果,提出了关键设计参数。研究结果表明:LOS声屏障适用于噪音水平超标较小与住户较少的地区;路面类型对降噪效果影响较大,将水泥混凝土路面更换为密级配沥青混凝土路面与开级配沥青混凝土路面可以明显提高降噪幅度和降噪有效率;采用限速方法降低噪音并不明显,不推荐采用限速的方法提高声屏障降噪效果;LOS声屏障设计时,设计降噪幅度宜大于6.7dBA,最低高度应大于路面行驶的大型车辆高度,最大高度不超过6.6m,最佳高度由设计年限内降噪效果模拟分析确定。
In order to evaluate the effectiveness of LOS sound barrier in noise level exceeding the standard and less households, the noise test and TNM analysis of the new LOS sound barrier test section of I-465 Freeway in Indiana, USA were conducted. The effects of pavement type, vehicle speed, The effects of traffic volume, noise reduction coefficient, sound barrier height and sound barrier prolongation on noise reduction of LOS sound barrier are evaluated, and the application effect of LOS sound barrier is evaluated. The key design parameters are proposed. The results show that the LOS sound barrier is suitable for the areas where the noise level is too small and the household area is relatively small. The type of pavement has a great influence on the noise reduction effect. The replacement of the cement concrete pavement with the dense graded asphalt pavement and the open graded asphalt pavement can The noise reduction rate is obviously improved and the noise reduction efficiency is obviously improved. It is not obvious to use the speed limit method to reduce the noise. It is not recommended to use the speed limit method to improve the sound barrier noise reduction effect. When designing the LOS sound barrier, the designed noise reduction range should be larger than 6.7 dBA, The minimum height should be greater than the height of a large vehicle traveling on the road. The maximum height shall not exceed 6.6m. The optimum height shall be determined by simulation analysis of the noise reduction effect within the design life.