Analysis of Subgrade Vibration and Dynamic Stress of Heavy Haul Railway with High Embankment based on ZL-TNTLM Program

Abstract

Aiming at the high embankment section of heavy-load Railway, a finite element model of dynamic response of subgrade structure under train load is established, and ZL-TNTLM program is used to apply load excitation. The results show that the dynamic stress on the top of the roadbed is a single peak curve under heavy train load, and the peak value of the vertical acceleration vibration changes obviously under heavy train load, and presents a periodic change With the increase of the train speed, the dynamic pressure stress of the track bed and the foundation bed does not increase obviously with the increase of the train speed, but fluctuates and changes slowly; the dynamic stress and the vertical acceleration in the roadbed attenuate non-linearly along the depth direction The attenuation of acceleration is greater than dynamic stress along the direction of subgrade depth. The results are of theoretical and engineering significance for revealing the dynamic stress and vertical acceleration mechanism of heavy-haul railway subgrade under the change of high-speed train speed.