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以连霍高速宝天段为研究对象,监测分析现有声屏障保护下沿线19个噪声敏感点噪声影响现状,结果显示昼间和夜间噪声差值最大为9.8dB,最小为3.9dB,平均昼夜声压值差为6.7dB;单因子指数昼间19个噪声敏感点中5%达到1.0,37%达到0.9,3所学校噪声污染指数分别为0.8、0.8、0.9,夜间16个噪声敏感点中31%达到1.0,79%达到0.9,夜间噪声影响更为突出。并根据pcu与dB关系、敏感点距路中心线距离和路基高差,针对性地提出种植降噪绿化带、加高及改进声屏障类型等降噪措施。
Taking the Lian-Huo Expressway Bao-Tian section as the research object, the noise impact status of 19 noise-sensitive points along the existing sound barrier is monitored and analyzed. The results show that the maximum difference between daytime and nighttime noise is 9.8dB and the minimum is 3.9dB. The pressure difference was 6.7dB. The single-factor index reached 5% of the 19 noise-sensitive spots during the day, reaching 1.0 and 37% reaching 0.9. The noise pollution indexes of the three schools were 0.8, 0.8 and 0.9 respectively. Among the 16 noise-sensitive spots at night, 31 % Reached 1.0, 79% reached 0.9, the impact of noise at night is more prominent. Based on the relationship between pcu and dB, the distance between the sensitive point and the center of the road and the height of the subgrade, the noise reduction measures such as planting noise reduction green belt, raising and improving the type of sound barrier are put forward.