Prediction Model for Fatigue Life of Asphalt Concrete Waterproof Sealing Structure in High Speed Railway Subgrade Under Freeze-thaw Action
Taking the asphalt concrete waterproof sealing structure of high speed railway subgrade as the research object,fatigue tests and freeze-thaw cycle tests were designed considering the meteorological conditions in seasonally frozen soil areas to study the influence of freeze-thaw cycle on the evolution of its fatigue characteristic parameters.A fatigue life prediction model for asphalt concrete waterproof sealing structures in high speed railway embankments under freeze-thaw cycles was proposed by combining the action law of stationary values and freeze-thaw cycles.The reliability of this fatigue life prediction model was verified using the average value of the fatigue limit critical point.The results show that the curve between the rate of change in dissipated energy of asphalt concrete and the number of loading cycles shows three stages before and after freeze-thaw.The fatigue life of asphalt concrete waterproof sealing structures decreases with the increase of freeze-thaw cycles,and the reduction amplitude becomes larger and larger,resulting in significant damage to their fatigue resistance performance.After verification,the fatigue life prediction model for asphalt concrete waterproof sealing structures in high speed railway subgrade is accurate and reliable.
万方数据
维普
