摘要:研究目的:轨道板与自密实混凝土层间的离缝是服役过程中CRTS m型板式无砟轨道结构的典型病害 之一。本文根据CRTS m型板式无砟轨道结构的受力特点，通过建立有限元力学分析模型，提出一种抑制轨 道板与自密实混凝土层离缝的“T”型门型筋加密方案。研究结论:（1）负温度梯度荷载作用是导致板边离缝的主要原因，而列车荷载和正温度梯度荷载耦合作 用是导致板中和轨下离缝的主要原因；（2)无离缝时，门型筋加密后轨道板与自密实混凝土层界面竖向最大 拉应力降低80% ; 3)有离缝时，门型筋加密后离缝处界面竖向拉应力显著降低87% ;（4) “ T”型门型筋加密 方案有利于提高轨道板与自密实混凝土层界面竖向拉裂的安全系数，降低界面离缝的发生概率，减缓离缝区 域的扩展速度，提高服役过程中轨道结构的耐久性；（5)该研究成果对于优化CRTS m型板式无砟轨道的结构 设计具有参考价值。

Abstract ： Research purposes ： The gap between slab and self - compacting concrete is one of the typical diseases for CRTS m slab ballastless track structure under service condition. This paper established finite element mechanical analysis model of track structure according to the CRTSm slab track structure characteristics, and an “T” type reinforce scheme of door type steel was proposed. Research conclusions:(1) The negative temperature gradient load is the main reason of the production of the gap in the edge of the slab，and the coupling effect of the train and positive temperature gradient load is the main reason of the production of the gap in the middle of the slab. (2) When non - gap of the interlayer appears，the vertical maximum tensile stress of interface is reduced by 80% after reinforce door type steel. ( 3 ) When gap of the interlayer appears, the vertical maximum tensile stress of interface is reduced by 87% after reinforce door type steel. (4) A “T” type reinforce scheme of door type steel is conducive to improve the safety factor of interface is shattered. It can also reduce the probability of the occurrence of gap between the slab and self compacting concrete，slow down the expansion rate of the isolated region，and improve the durability of track structure under the course of service. (5) The research is useful to optimal designs of CRTS m slab ballastless track structure.