Influence of the Compactness on the Mechanical Properties of Ballasted Track

Abstract

Compactness is one of the indexes to measure ballast stability, and the dynamic stabilization operation parameters change with the initial ballast compactness. To improve the operation efficiency of the dynamic stabilization unit, a coupling model of dynamic stabilization unit-ballast was established by using the discrete element-finite element coupling method. The single-factor method was adopted to study the influence of different initial compactness on the mechanical characteristics of ballasted bed during the dynamic stabilization unit operation. The dynamic stabilization unit test rig was built to verify the rationality of the simulation model. Through simulation and experimental verification, the results show that the ballast lateral resistance increases with initial compactness and the ballast vertical displacement decreases with increasing compactness. When the sleeper is in the left and right pole position, the ballast particle force angle under the sleeper is 35°, and the ballast force error in the left and right pole position is reduced by 14.2% when the compactness is 0.654.