京沪高速铁路不同线路形式噪声暴露研究

Study on Noise of Different Lines in Beijing-Shanghai High-speed Railway

高速铁路以其运营量大、车速快、时间准、安全快捷的优势适应现代社会经济发展的新需求,已经成为我国发达地区城市间主要的客流交通运输方式,在高速铁路快捷的给人民群众提供便利的出行时,其在运行过程中对铁路沿线两边环境造成了严重的噪声污染。选取京沪高铁安徽段为研究对象,研究高速铁路运行期间不同型号高速列车的噪声传播途经以及变化规律,分别按照高架、路基、路堑三种不同线路形式噪声衰减进行分析。结果表明:高速列车通过高架线路的1h等效声级噪声值先随距离增大后减小,在30m处噪声值较大,随后随距离增大而减小;单车声暴露级的衰减规律与单车通过声级和1h等效声级的衰减规律基本相似。高速列车通过路基线路的1h等效声级衰减规律与桥梁线相比衰减趋势比较一致,但未明显出现桥梁段的先增大后减小的趋势;单车通过等效声级的衰减总体趋势随距离增大而减小。高速列车通过路堑线路的1h等效声级的衰减随着距离增加,与路基形式基本相似,但未出现高架的先增加后减小的情况;路堑的单车通过等效声级在距离衰减规律与路基基本相似,但其衰减更快。

High-speed railway with its operation,fast speed,high volume time accurate,safe and fast advantage to adapt to the new requirements of modern social and economic development,has become a major passenger flow between developed areas in our country city transportation way.When the high-speed railway provides convenient transportation to the people,it causes serious noise pollution to the environment along the railway line during the operation.This paper selects the Anhui section of Beijing-Shanghai high-speed railway as the research object.This paper studies high speed railway running different types of high-speed train noise transmission route and change law of respectively according to three different elevated,roadbed,cutting line in the form of noise attenuation.Results showed that：The equivalent sound level noise value of the high-speed train through the 1 hof the elevated line decreases first with the distance.And the noise value at 30 mis large then decreases with the increase of distance.The attenuation law of the acoustic emission level of the bicycle is basically similar to the attenuation of the equivalent sound level of the bicycle through the sound level and 1 h.The attenuation of 1 hequivalent sound attenuation of high speed trains is consistent with that of the bridge line.But it is not obvious that the first increase of the bridge segment decreases.The overall trend of the attenuation of the bicycle by the equivalent sound level decreases with the distance.The attenuation of the 1 hequivalent sound level of the high-speed train through the cutting line increases with the distance,which is basically similar to the subgrade form.But it does not show the condition that the elevated first increases and then decreases.The distance attenuation law is similar to the subgrade by the equivalent sound level.But its attenuation is faster.