厦深铁路广东段环境边界噪声预测浅析

Forecast of the Ambient Noise in the Boundary of XiamenShenzhen Railway Segment in Guangdong Province

分别根据实际监测和国内修正模式计算预测厦深铁路广东段沿线环境边界噪声,探讨铁路环境边界噪声的预测方法.结果表明：根据实际监测计算预测,噪声水平昼间为47.98 dB（A）～66.81 dB（A）,夜间为42.59 dB（A）～54.64 dB（A）;列车时速200 km/h 时,昼间和夜间噪声级分别低于限值14.82 dB（A）和13.17 dB（A）;根据国内修正模式的计算预测,噪声水平昼间为56.12 dB（A）～72.60 dB（A）,夜间为42.89 dB（A）～59.38 dB（A）;列车时速200 km/h 时,昼间和夜间噪声级分别低于限值6.09 dB（A）和9.31 dB（A）;由国内修正模式计算预测沿线边界噪声等效声级时,桥梁测点因“二次噪声”所产生的4.0 dB（A）修正值有所偏大,建议为1.5 dB（A）;本条铁路线边界噪声预测中根据国内修正模式计算预测的沿铁路线边界噪声等效声级较实际监测计算预测值大,昼间大6.0 dB（A）左右,夜间大3.0 dB（A）左右.

The prediction method based on the actual monitoring and the domestic correction mode was discussed. The ambient noise in the boundary of Xiamen-Shenzhen railway segment in Guangdong province was calculated and forecasted. The results show that (1) In the calculation and the prediction of actual monitoring, the noise levels of daytime and at night are 47.98 dB(A)-66.81 dB(A) and 42.59 dB(A)-54.64 dB(A) respectively. Besides, the noise levels of daytime and at night are below the limits of 14.82 dB(A) and 13.17 dB(A) respectively when the train travels at 200 km/h speed. (2) In the calculation and prediction of the domestic correction mode, the noise levels of daytime and at night are 56.12 dB(A)-72.60 dB (A) and 42.89 dB(A)-59.38 dB (A) respectively. Besides, the noise levels of daytime and at night are below the limits of 6.09 dB(A) and 9.31 dB(A) respectively when the train travels at 200 km/h speed. (3) The corrected value of the noise level 4.0 dB(A) at the bridge measurement point generated by the secondary noise is overlarge in the calculation and prediction of the domestic correction mode, and the suggestion value is 1.5 dB(A). (4) The equivalent sound levels of the boundary noise along the railway predicted by the domestic correction mode are 6.0 dB(A) and 3.0 dB(A) in daytime and at night respectively which are larger than those by the actual monitoring.