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目的了解声屏障建设前后学校声环境的控制效果。方法对铁路声屏障建设前后学校声环境监测昼间、夜间1 h等效声级(Leq)、最大噪声级(Lmax)。结果声屏障建设后昼间、夜间Leq分别降低2.5~11.1和11.9~22.9 dB(A);昼间、夜间L max分别降低0.0~0.2和13.0~15.1 dB(A);昼间降噪效果不明显,但监测结果均符合国家标准;夜间降噪效果明显,但监测结果均不符合国家标准。结论声屏障建设后铁路噪声仍然对学校环境造成一定影响,声屏障降噪效果有待进一步提高。
Objective To understand the control effect of school acoustic environment before and after construction of sound barrier. Methods Before and after the construction of railway sound barrier, the acoustic environment of school was monitored for 1 h equivalent sound level (Leq) and maximum noise level (Lmax) at daytime and night time. Results After noise barrier construction, Leq decreased by 2.5-11.1 and 11.9-22.9 dB (A) at daytime and nighttime, respectively, and L max decreased by 0.0-0.2 and 13.0-15.1 dB (A) at daytime and nighttime respectively. The daytime noise reduction effect was not significant Obvious, but the monitoring results are in line with national standards; night noise reduction effect is obvious, but the monitoring results are not in line with national standards. Conclusion After the construction of noise barrier, the railway noise still has a certain impact on the school environment, and the sound barrier noise reduction effect needs to be further improved.