Effect of cement asphalt mortar disease on dynamic performance of slab track

Abstract

According to the analysis theory of spatial vibration of high-speed train and slab track system, the effect of voided slab induced by deteriorations of cement asphalt mortar (CAM) layer, such as felt invalidation, dehiscence, embrittlement and cataclasm, etc, on vibration responses of the slab track was studied. The results show that, compared to the normal work condition of the CAM, the slab accelerations increase by ten times and the slab displacements increase by twenty times during the action of the voided slab induced by the CAM deterioration. The pressures between rails and slabs increase rapidly and the tensile forces appear. With the increase of velocity, the other dynamic responses of the system increase rapidly. Thus, the CAM deteriorations should be strictly controlled during the slab track maintenance.