持续高温下CRTS Ⅲ型板式轨道温度翘曲试验研究OA

In order to study the temperature warping effect of CRTS Ⅲ slab ballastless track under continuous high temperature environment,the field test method was used to monitor the temperature and strain of track slab for a long time.Based on the monitoring data,the temperature distribution law of the track slab under continuous high temperature was studied,and the temperature warping effect of the track slab was analyzed.The results show that the temperature of the track slab shows a wave-like upward trend in the continuous high temperature environment.Among them,the bottom surface temperature lags behind the top surface temperature,the phase difference is about 1.5～4 h,and the positive temperature gradient time in the plate is greater than the positive temperature gradient time at the edge of the plate.Under the positive temperature gradient load,the curvature is positive,and the track slab is arched;under the negative temperature gradient load,the curvature is negative,and the track slab warps downward.The linear function relationship between the warping curvature of the track slab and the vertical temperature gradient is fitted.The fitting coefficient R2 is above 0.85,and the temperature strain change value and the warping curvature value increase with the increase of the vertical temperature gradient.The research results can provide experimental basis and data support for the temperature warping deformation of CRTS Ⅲ slab ballastless track under continuous high temperature environment,and provide important guarantee for ensuring the safe,stable and efficient operation of high-speed railway.