Establishment and mechanical performance analysis of manual tamping operation model for ballast bed
To study the mechanism of the effect of manual tamping operation on the quality state of the track bed,a simulation model of the manual tamping device-ballast bed was established based on the modeling method of coupling of discrete element and multi-body dynamics.The tamping process of workers was effectively simulated,and the correctness of the model was verified through on-site test results.The impact of manual tamping on the stiffness and contact state of the ballast bed was analyzed.The results show that manual tamping operation can reduce the stiffness of the ballast bed.After the operation,the support stiffness is 101.85 kN/mm,reducing by 28.48%,and the rebound stiffness is 206.77 kN/mm,reducing by 9.02%.During the tamping and vibrating stages,the contact state between the ballast changes,with the increasing number of contact between the sleeper and ballast particles,which is beneficial to filling the gaps under the sleeper.The coordination number of ballast gradually increases during the retracting stage,and the distribution of normal contact force tends to be uniform,which is conducive to the stability of ballast bed.The manual tamping operation effectively reduces the difference in contact status between the ballast in the surrounding area of the sleeper.
ballast bedmanual tamping devicediscrete elementcoupling algorithmcontact state
万方数据
维普
