复合轨枕道床横向阻力增强方法

为解决复合轨枕道床横向阻力不足的问题,基于复合轨枕材料和结构,提出横向阻力增强方案。采用3D扫描技术生成道砟颗粒模板库,构建轨枕-道床离散元三维模型,模拟分析了各种纹理复合轨枕对道床横向阻力的分担规律及其增强效果,并从细观层面分析了轨枕与道砟颗粒相互作用机理。结果表明:与普通条形复合轨枕相比,A1型,A2型,A3型,A4型,A5型纹理复合轨枕道床横向阻力可分别提高9.3%～11.4%,17.8%～23.6%,27.4%～32.0%,16.6%～21.8%,17.7%～21.2%;在复合轨枕与道砟接触表面设置纹理可增强轨枕表面与道砟颗粒之间的咬合,有效增大轨枕底面与道砟颗粒接触数目及轨枕侧面与道砟颗粒间平均接触力,提高枕底及枕侧阻力。

A Method for Reinforcing Ballast Bed Lateral Resistance of Composite Sleepers

In order to solve the problem of insufficient ballast bed lateral resistance of composite sleeper and based on the material and structure of composite sleeper,a scheme to enhance lateral resistance was proposed.The ballast particle template library was generated by 3D scanning technology,and the discrete element 3D model of sleeper-ballast bed was constructed.The sharing law and enhancement effect of various texture composite sleepers on the lateral resistance of ballast bed was simulated and analyzed,and the interaction mechanism between sleeper and ballast particles were analyzed from the micro level.The results show that compared with ordinary strip composite sleepers,the lateral resistance of A1,A2,A3,A4 and A5 texture composite sleepers can be increased by 9.3%~11.4%,17.8%~23.6%,27.4%~32.0%,16.6%~21.8%and 17.7%~21.2%respectively.Setting texture on the contact surface between the composite sleeper and ballast can enhance the occlusion between the sleeper surface and the ballast particles,effectively increase the contact number between the sleeper bottom surface and the ballast particles,enhance the average contact force between the side of the sleeper and the ballast particles,and improve the resistance of the sleeper bottom and the sleeper side.