基于车辆-轨道耦合动力学理论，针对30 t 轴重货车和重载铁路轨道结构，研究了新、旧扁疤作用下的轮轨动力作用特征，并对两种扁疤形式的最大允许限值提出了相应的建议。结果表明：新扁疤作用下，轮轨垂向力会出现典型的高频作用力和低频作用力，根据英国铁路轮轨冲击力的限值标准，新扁疤长度的最大允许限值建议采用37 mm；旧扁疤作用下，轮轨垂向力不再出现高频作用力和低频作用力，代之以最大轮轨作用力出现，结合美国铁路工程协会关于动荷载系数2.0的标准和轮重减载率0.8的限值，旧扁疤长度最大允许限值建议采用45 mm。%This paper presents an investigation on the effect of wheel flats on wheel/ rail dynamic interac-tion and the allowable limit of wheel flats in heavy - haul railway of 30 - ton axle load on the basis of the vehicle - track coupled dynamics. Results show that high frequency force P1 and low frequency force P2 would be occur under the condition of newly formed wheel flat,whereas they would not appear instead of the maximum force Pmax under the condition of rounded wheel flat. Finally,the suggested allowable limit length of the wheel flats should be within 37 mm for newly formed wheel flat based on the standards of P1 and P2 stipulated by British Railway and within 45 mm for rounded wheel flat according to an assumed im-pact factor of 200% proposed by AREMA and an limit of 0. 8 for the rate of wheel load reduction.
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