Influences of ballast gradation on railway ballast bed dynamic characteristics based on Laser Scanning and Discrete Element Method

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (5) : 127-133.

XU Yang1,2,GAO Liang1,2,CAI Xiaopei1,2,HOU Bowen1,2,ZHAO Yunzhe1,2

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Abstract

Ballast gradation has obviously an influence on ballast bad’s dynamic performances.The three-dimensional laser scanning technique was used to capture and analyze shape features of ballasts bere.Based on the reconstructed results of ballast shape,a construction method of ballast discrete element model was proposed.Then,a ballast box numerical model with cyclic loading was established.The influence laws of ballast gradation on ballast bed dynamic settlement under high-speed and heavy-haul railway conditions were studied with the numerical model,the microscopic ballast bed settlement mechanism was analyzed as well.The results showed that the railway ballast bed has different degradation mechanisms under different operation conditions,the relative motion between ballasts is the main reason for the settlement of heavy-haul railway ballast bed; for high-speed railway,the settlement of ballast bed is influenced by the rotation of ballast particles as well.Thus,it was suggested that different railway conditions should adopt different ballast gradation curves in the design code.

Key words

railway ballast bed / ballast gradation / discrete element method / ballast bed degradation / dynamic response

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XU Yang1,2,GAO Liang1,2,CAI Xiaopei1,2,HOU Bowen1,2,ZHAO Yunzhe1,2. Influences of ballast gradation on railway ballast bed dynamic characteristics based on Laser Scanning and Discrete Element Method[J]. Journal of Vibration and Shock, 2017, 36(5): 127-133

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