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Abstract: cement asphalt mortar (CAM) softening is a common phenomenon that results from ageing and rain soaking when a high-speed railway is in service. CAM softening seriously affects vehicle operation safety and track dynamics. In this paper, a 3D coupling dynamic model of a vehicle and a China railway track system I (CRTS-I) slab track is developed. By using the proposed model, the wheel-rail contact forces, derailment coefficient, wheelset loading reduction ratio, and the track displacements are calculated to study the influences of CAM softening on the dynamic characteristics of a vehicle-track system. A track-subgrade finite difference model is developed to study the effect of CAM softening on track damage. The results show that track interface shear failure develops when the CAM softening coefficients reach 10–100. The CAM softening coefficient should not be less than 1000, otherwise a high-speed running vehicle may risk derailment.

Cement asphalt mortar (CAM) is vastly used in the structure of high-speed railroad system, serving as a cushion layer between the slab and concrete base. In practice, deterioration and even failure of CAM layer often occur seriously after some years of service. As an organic-inorganic composite material, many factors, including rain soaking, fatigue are involved in the deterioration process of CAM. This paper is focusing on the effect of CAM softening on the vehicle operation and track damage by using the developed coupling dynamic model. The topic of this paper is highly relevant to the high-speed railway practice and the findings are very highly valuable for understanding the risk of CAM deterioration in the whole high-speed railway system.

沥青混凝土砂浆层软化对车辆行驶安全性和轨道动力特性的影响

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