Influence of Impact Manual Tamping Operation on Effect of Action and Quality Status of Ballasted Bed
Manual tamping operation,as one of the important ways to achieve daily maintenance of small sections of rail lines,can effectively improve the geometric shape of the track,alleviate the unevenness of the line,and ensure the safe-ty of train operation.However,currently,the maintenance work of manual tamping devices mainly relies on the practical engineering experience of on-site workers,without relevant theoretical research.To study the working mechanism of the manual tamping device for ballast bed,based on the discrete element method(DEM)-multi-body dynamics(MBD)coupling method,this paper established a simulation model of the coupling of the manual tamping device-sleeper-ballast bed to conduct lateral resistance tests on site before and after the manual tamping operation to verify the reliability of the model,and to analyze the impact of manual tamping operation on the contact force of ballast particles and the compact-ness of the ballast bed.The results show that manual tamping operation can reduce the lateral resistance of the ballast bed by 19.51％,and weaken the lateral stability of the ballast bed.During the inserting stage,there will be significant changes in the distribution of contact forces between the ballast,with the distribution of horizontal plane contact forces changing from approximately circular to elliptical,and the distribution of longitudinal plane contact forces changing from semicircular to bouquet shaped.The contact relationship between particles is constantly changing,with a new stable transmission relationship gradually established.The tamping operation will force the ballast particles to move,reducing the compactness of the sleeper box and the ballast shoulder.Therefore,after the manual tamping operation,the ballast particles at the sleeper box should be filled in time,and the ballast at the shoulder should be tamped.
万方数据
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