1.College of Civil Engineering,Beijing Jiaotong University，Beijing 100044，China;
2.Beijing Engineering and Technology Research Center of Rail Transit Line Safety and Disaster Prevention,Beijing 100044,China
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.
徐旸1,2，高亮1,2，蔡小培1,2，侯博文1,2，赵云哲1,2. 基于激光扫描法的铁路道砟级配对道床动力特性影响的离散元研究[J]. 振动与冲击, 2017, 36(5): 127-133.
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. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(5): 127-133.
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