中文摘要：

轨道板与水泥乳化沥青砂浆离缝是CRTSⅡ型板式无砟轨道的主要伤损形式之一，水泥乳化沥青砂浆具有支承、缓冲、传载等作用，离缝将影响无砟轨道的变形与受力。基于弹性地基梁体理论和有限元方法，建立了路基上CRTSⅡ型板式无砟轨道有限元模型，分析在温度荷载和自重作用下不同离缝长度以及产生离缝后CA砂浆层参数对轨道结构的影响。结果表明：轨道板的翘曲位移及纵向应力均随着离缝长度增大而增加；当离缝长度超过1．95m时，轨道板的翘曲变形及纵向应力都急剧增大，建议轨道板与CA砂浆层离缝长度不宜超过1．95m。

英文摘要：

The debonding between the slab and emulsified asphalt cement mortar is one of the main failure modes of CRTS-Ⅱ slab track; the emulsified asphalt cement mortar plays the roles such as supporting, buffering and transferring the forces, so the debonding between the slab and CA mortar will have negative effects on stress state and deformation behaviors of ballastless track. In this paper, based on elastic foundation beam theory and finite element method, the finite element model of CRTS-Ⅱ slab track on railway subgrade was established. And then the influences on the track structure caused by different lengths of debonding and caused by the parameters of CA mortar after the debonding appeared were analyzed under the actions of both temperature load and self weight load. The results show that both the warping deformation and the longitudinal stress increase with the growth of the debonding length; if the debonding length exceeds 1.95 m, both the warping deformation and the longitudinal stress will increase sharply. So it is suggested that the debonding length between the slab and CA mortar should be controlled within 1.95 m.