基于离散元法的聚氨酯固化道床力学特性

Mechanical Properties of Polyurethane Ballast Bed Based on Discrete Element Method

摘要:

提出了一种基于黏接力链单元的聚氨酯固化道床数值仿真分析方法，并在此基础上对聚氨酯固化道床与普通散体碎石道床在循环荷载作用下的力学性能进行了对比分析.结果表明，聚氨酯固化道床能够通过减小道床残余变形、改善道砟颗粒间接触状态的方式起到延缓道床累积沉降的目的；聚氨酯材料在延缓道床累积沉降的同时，也会导致轨枕的动位移增大.

Abstract:

A discrete element method(DEM) model of polyurethane ballast bed based on bonding force chain unit was proposed in this paper, based on which, a comparative analysis between common ballast bed and polyurethane ballast bed under cyclic loading was conducted. The results show that polyurethane can lessen the ballasts bed cumulative settlement by reducing the residual deformation and improving the contact status of ballasts. Besides, polyurethane can also increase the dynamic displacement of the sleeper.