高速公路声影区判别及噪声预测值修正探讨

Discussion on the Discrimination of Acoustic Shadow Zone of Expressway and Modification of Noise Prediction Values

以某拟建高速公路项目典型路段作为研究对象,对高路堤、低路堑的声影区、声照区进行判别,并计算声影区引起的附加衰减量,对交通噪声预测值予以修正。高路堤段声影区引起的交通噪声附加衰减量达到8～13.7dB(A),低路堑段声影区引起的交通噪声附加衰减量达到8～17.6 dB(A)。结果表明,道路沿线交通噪声污染程度受高路堤、低路堑声影区影响显著。在道路交通噪声预测计算过程中,应重视高路堤、低路堑声影区引起的附加衰减量,以使预测结果真实、可靠。该研究可为全面、准确地进行道路交通噪声的预测评价提供参考和借鉴。

Taking a typical section of a proposed expressway project as a research object,this paper corrects the values of noise prediction based on the discrimination of acoustic shadow zone and acoustic radiation area of high-filled subgrade and cutting subgrade,as well as the calculation of attenuation caused by acoustic shadow zone.The additional attenuation of traffic noise caused by acoustic shadow zone of high-filled subgrade reaches 8~13.7 dB(A),and the other of cutting subgrade reaches 8~17.6 dB(A).The results show that the level of traffic noise pollution along the road is significantly affected by t acoustic shadow zone of of high-filled subgrade and cutting subgrade.In the calculation of road traffic noise prediction,we should pay attention to the additional attenuation caused by acoustic shadow zone,so as to make the prediction true and reliable.This paper can provide reference for comprehensive and accurate prediction and evaluation of road traffic noise.