Mechanism of ballast bed-bedding surface coupled deformation based on DEM

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (7) : 186-192.

GAO Liang 1, YIN Hao 1, XU Yang 1，Yang Guo-tao 1,2

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Abstract

A sleeper-ballast-bedding surface coupled model was established with DEM to simulate the coupled action mechanism of ballast-ballast, ballast-sleeper, and ballast-bedding surface based on realistic appearance of ballast. The track structure loads-bearing characteristics, elastic and plastic deformation mechanism, and ballast bed/ bedding surface’s proportion under the condition of high-speed operation were studied deeply based on the model verified. The results showed that the track contact force shaped like a frustum is passed down, it extends below the syncline as a bevel; there are mutual invason phenomena of ballast-bedding surface, the proportion of ballast bed settlement is 83.9%~86.8%; track vertical elastic and plastic deformations and the proportion of ballast bed settlement increase nonlinearly with increase in train speed and train axle loads; the effects of train speed on track vertical deformation exceed those of train axle loads.

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ballast bed / bedding surface / deformation mechanism / mechanical characteristics / discrete element method (DEM)

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GAO Liang 1, YIN Hao 1, XU Yang 1，Yang Guo-tao 1,2. Mechanism of ballast bed-bedding surface coupled deformation based on DEM[J]. Journal of Vibration and Shock, 2018, 37(7): 186-192

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