基于DEM-MBD联合仿真的车致有砟道床破碎分析

DEM-MBD Co-simulation-based Breakage Analysis of Ballasted Bed Caused by Train Movement

摘要:

为分析车致有砟道床破碎，建立有砟轨道DEM-MBD联合仿真模型，分析列车荷载对道床稳定性的影响及道床内不同位置、不同形状道砟的破碎规律。结果表明：列车荷载作用后，道床横向阻力下降14.82%；枕下深度0.21m内，承轨槽正下方道砟较枕心正下方更易破碎；枕下深度0.12~0.24m内的道砟破碎率最高，为12.5%；砟肩道砟基本未破碎；片状道砟较常规状、针状道砟更易破碎；在运营的有砟轨道线路上，应减少片状道砟含量且重点关注枕下深度0.24m内的道砟破碎情况。

Abstract:

In order to analyze the breakage of ballasted track caused by train movement， the discrete element method-multibody dynamics(DEM-MBD) co-simulation model of ballasted track was established to analyze the influence of train load on the stability of ballasted track and the breakage law of ballasts on different positions in different shapes on ballasted bed. The results show that after train load， the lateral resistance of track bed decreases by 14.82 %； in the depth of 0. 21m below the sleeper， the ballast below the rail ditch tends to be broken rather than that below the sleeper center； the highest broken rate of ballast is 12.5 % when ballast is at the depth of 0.12~0.24m below the sleeper； the ballast at the shoulder is basically unbroken； flat ballast is more easily broken than normal and long ballast； in the operation of ballasted track lines， the content of flat ballast should be reduced and the ballast breakage at the depth of 0.24m below the sleeper should be paid much attention to.