温度力和列车动载共同作用下无缝线路稳定性试验研究

Study and Experimentation on the Stability of CWR Track Under the Combined Action of Temperature Force and Moving Train

本文介绍铁道部科学研究院铁建所在环形试验基地,进行温度力和列车动载共同作用下稳定性试验,这一试验获得了描述无缝线路产生“弹动”现象的失稳过程特征曲线。试验模拟车辆转向架之间轨排浮起,测定了道床横向阻力以及轨温昼夜变化,无缝线路在具有初始弯曲的地方所产生的横向累积变形,运用试验资料,进行计算,编制我国无缝线路稳定性允许温差表,供推广应用。

The paper presents the experiments sponsored by the Railway Engineering Research Institute of the Academy at the loop testing track on the subject of stability of continuous welded rail track under the combined action of temperature force and moving train. The characteristic curve showing the course of bouncing on track buckling was obtained. The floating portion of the track between the two bogies of a freight ear was modelled for the measurement of the lateral ballast resistance and the accumulated la-teral displacement at the misaligned track portion due to day and night temperature fluctuation was also measured. By computation with the test data, a table of temperature rise allowance ensuring stability of CWR track was compiled. The table will be useful for safe upkeep of CWR track in China.