VISCO-ELASTIC MODEL FOR HIGH-FILLED EMBANKMENT UNDER CYCLIC LOAD

Aiming at the questions that it is possible for high-filled embankment to result in the large deformation under cyclic load and then to intensify the train and environment vibration, the stress in subsidence on high embankment is simplified to combined stress, and the visco-elastic model of high-filled embankment is established. Influences of the load parameters to the calculation model is discussed. The more high frequency is,the more short time is to the most stain in the first cycle. With decreasing the frequency of cyclic load, the time that strain reaches the most strain in the first cycle will increase and the long-term strain will increase too. the long-term strain which is linear function of the amplitude parameter of cyclic load will increase with the increase of amplitude parameter of cyclic load, and the increasing speed of it will decrease with the increase of frequency of cyclic load. The conclusions are helpful to evaluate the vibration characteristic of the subgrade of high-speed railway.