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.
