基于强度折减法的重载铁路路基边坡稳定性三维模型分析

摘要

China's railway embarks on an upgrade of axle load to existing heavy haul lines,yet the greater load poses challenges to the stability of the subgrade slope.In this light,the paper applies the strength reduction method to the T hree-dimensional analysis on slope stability,and compared the results arrived with that from the limit equilibrium method ( M-P method) and T wo-dimensional strength reduced method.Statistic shows that the approach is reliable and can be used in further study.In the meantime,the paper discovers that enforcement measures need to be taken beforehand to ensure the operation safety of the heavy haul train.%既有线开行大轴重列车是发展重载铁路的重要途径，但提高轴重会影响路基边坡的稳定性。将强度折减法应用于重载铁路路基边坡稳定性的三维分析，并与传统极限平衡法和二维强度折减法计算结果进行了对比，表明基于强度折减法的重载铁路路基边坡稳定性三维有限元分析是可行的。采用三维强度折减法分析了列车轴重对路基边坡稳定性的影响，结果表明在既有线上开行大轴重列车将降低路基边坡的稳定性，应事先对薄弱路段进行加固，以保证行车安全。