中文摘要：

CRTSⅠ型板式无砟轨道的CA砂浆产生伤损后,容易形成轨道板板底脱空,造成轨道刚度局部突变,不利于轨道结构受力和行车安全。通过对框架型板式轨道砂浆层伤损进行现场试验,评估砂浆伤损对轨道系统动力特性的影响。基于轮轨系统动力学原理,建立车辆-框架型板式轨道垂向耦合振动模型,研究分析不同形式、尺寸的砂浆伤损对轮轨系统动力特性的影响。现场试验和理论研究表明：宽度小于0.2 m 的砂浆伤损对行车的影响有限,列车轴重对砂浆伤损的影响明显；轨道板端砂浆伤损形式对轮轨系统振动的影响较大,当砂浆伤损沿纵向宽度超过0.6 m时,车辆和轨道系统各部件动力响应明显增大；从动力学的角度出发,砂浆伤损沿轨道纵向宽度不宜超过0.6 m,沿轨道横向宽度不宜超过0.2 m。

英文摘要：

After damaging CA mortar of CRTSⅠslab track,voids beneath the track slab are easy to form, which causes local mutations of track stiffness and detrimentally affects the carrying capacity of the track structure and traffic safety.In this paper,damages to CA mortar for the frame type slab track were tested on site;the effect of mortar damages to vertical vibration performance of the rail system was evaluated.On the principle of dynamics of the wheel-rail system,the finite element model of vertical coupling vibrations of the vehicleframe type slab track system was established to study the influence of mortar damages of different forms and sizes on vertical dynamic characteristics of the wheel-rail system.Site tests and theoretical study show as follows：Mortar damages with a width less than 0.20 m has limited impact on traffic,and the effect of the axle load of train on mortar damages is prominent;mortar damages at adj acent slab ends have comparatively great influence on vibrations of the wheel-rail system;when the longitudinal width of mortar damages exceeds 0.60 m,dynamic responses of all constituent parts of the vertical＆ rail system were significantly intensified;from the point of dynamics,the longitudinal width of mortar damages should not be more than 0.6 m whereas the transverse width of mortar damages should not be more than 0.2 m.