Abstract：Abstract：Research purposes：The noise source between high-speed railway and normal railway differs significantly, which hinders the sound barrier from working effectively in high-speed railway. Based on the noise source characteristics of high-speed railway, with reference to one ground section of the Wuhan-Guangzhou high-speed railway, a dual-source mode to study the noise reduction effect of high-speed railway sound barrier was established. Under different source modes, simulation analysis on the noise reduction effect of 3-meter vertical noise barrier was carried out.
Research conclusions：Compared simulation results with measured results, the calculated sound pressure level of dual-source mode is closer to the measured one, while the result of single-source mode is lower, the deviation is 8 dBA. Under the single-source mode, the insertion loss of sound barrier is about 10.7 dBA～13.1 dBA, which is significantly higher than the measured one. The noise of railway clearance is higher than 70 dBA, to improve the ecological environment of the railway line, many reasonable optimization methods of sound barrier were proposed. The dual-source mode which considered the pantograph-catenary noise can provide reliable reference for the design and application of high-speed railway sound barriers.
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