开展400 km/h 高速铁路噪声影响研究是践行"交通强国"战略的有力举措.为研究400 km/h 高速铁路噪声特性及辐射源强,获取现有直立式声屏障在速度400 km/h条件下降噪效果及适应性,采用有限元模型进行仿真计算,模拟计算400 km/h高速铁路噪声源强并进行组成分析,对高速铁路通用的直立式声屏障降噪效果、耐久性、安全性等进行分析研究,对目前直立式声屏障适应性提出实施建议.研究表明:高速列车以速度400 km/h运行时,距离铁路外轨中心线25 m、轨上3.5 m处,桥梁段总声级为97.8 dB(A),路基段总声级为96.7 dB(A),气动噪声大于轮轨噪声;提出现有直立式声屏障在速度400 km/h条件下插入损失为2.7～8.9 dB(A);在安全方面,提出立柱底部螺栓养护年限;针对目前铁路直立式声屏障通用图适用性进行分析,提出结构安全优化建议.研究结果可指导400 km/h 高速铁路噪声影响分析及直立式声屏障设计工作.
Noise Reduction Performance and Safety of Vertical Sound barriers for 400 km/h High Speed Railways
Conducting studies on the noise impact of 400 km/h high speed railways serves as an efficient approach to implementing the strategy of"building China's strength in transport".Finite element models were used for simulation and calculation to investigate the noise characteristics and radiation source intensity of 400 km/h high speed railways and determine the noise reduction performance and adaptability of existing vertical sound barriers at a train speed of 400 km/h.The noise source intensity of 400 km/h high speed railways was simulated and calculated and composition analysis was carried out,and analysis and study were conducted on the noise reduction performance,durability,and safety of vertical sound barriers commonly used for high speed railways,putting forward suggestions on the adaptability of existing vertical sound barriers.The study shows that if a high speed train runs at a speed of 400 km/h,the total sound pressure level is 97.8 dB(A)in the bridge section and 96.7 dB(A)in the earthworks section 25 m from the centerline of the outer rail and 3.5 m above the rail,and the aerodynamic noise is greater than the wheel-rail noise.An insertion loss of 2.7～8.9 dB(A)was proposed for existing vertical sound barriers at a train speed of 400 km/h.In terms of safety,the maintenance period of bolts at the bottom of posts was proposed.An analysis was conducted on the applicability of general drawings of existing vertical sound barriers for railways.Furthermore,suggestions were proposed to optimize structural safety.The results can guide the noise impact analysis and design of vertical sound barriers for 400 km/h high speed railways.
400 km/h high speed railwaytotal sound pressure level of noisevertical sound barriernoise reduction by sound barrieraerodynamic noisewheel-rail noise
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