有砟轨道框架纵向阻力试验研究

Research purposes: The longitudinal resistance of track bed reflects the ability of track bed to limit the longitudinal displacement of track and directly affects the stability of track. In order to further study the longitudinal resistance characteristics of ballast track panel, this paper established a full-scale model, carried out a series of tests to get the longitudinal resistance and displacement curve of the track, to explore the influence of the number of sleepers, sleeper crib fullness and sleeper spacing on the longitudinal resistance, and summarized and proposed measures to enhance the longitudinal resistance.

Research conclusions:(1) With the increase of the number of sleepers, the longitudinal resistance increases, but the average longitudinal resistance to each sleeper decreases. (2) The ballast crib fullness has a great influence on the longitudinal resistance of the track panel. When the crib ballast change from zero to full, the longitudinal resistance increases by 83.2%. (3) The sleeper spacing has a significant effect on the longitudinal resistance. When the sleeper spacing decreases from 600 mm to 500 mm, the longitudinal resistance increases by 12.27%. (4) The research results can be applied to the design, construction and maintenance of ballasted tracks, which can be used as a reference for improving the stability of ballast bed.