Discrete Element Study on Macro and Micro Characteristics of Tri-geogrid Reinforced Ballast Interface
To study the macro and micro mechanical responses to the geogrid-ballast interface under the pull-out load,this paper established the pull-out test numerical model of the tri-geogrid reinforced ballast based on the discrete element numerical simulation.The development of the strain of the geogrid axial force and the geogrid segment was revealed,and the evolution of the normal contact force between particles in the statistical region was analyzed by fitting.The results showed that the pull-out load was mainly borne by the front transverse rib and the macro mechanical characteristics between particles were determined by the contact force and anisotropy evolution between the ballast.
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