Experimental Study and Discrete Element Analysis on Mechanical Properties of Glued Ballast with Different Glue Consumption

The field test of the supporting stiffness of the glued ballast bed of high speed railway was carried out to obtain the data of the mechanical properties of the glued ballast bed with different glue consumption.The PFC3D was used to establish DEM model of glued ballast and the test data were used for parameter calibration and model validation.The supporting stiffness of the ballast bed with different glue consumption and the force chain,contact force and settlement of the ballast bed under the action of the train load were analyzed on the basis of the model.The results show that with the increase of glue consumption,the stiffness of the ballast bed presents a parabolic growth and the force chain area gradually expands.When the glue consumption increases from 0 to 43 kg/m3,the ballast bed contact tension and pressure values increase linearly.When the glue consumption reaches 43 kg/m3 and above,the pressure keeps stable and the tension keeps increasing.Compared with the ordinary ballast bed,the initial settlement of the glued ballast is smaller and easier to converge.The accumulated settlement of the glued ballast bed increases in function type growth with the increase of train load times and the greater the amount of glue,the easier it is to converge. © 2019, Department of Journal of the China Railway Society. All right reserved.