Changes in the Number of Rail Gauge Crimes after Laying Geosynthetics under the Sleeper Base

Abstract

Purpose: To consider the effect of laying geosynthetic materials in the foot-plate on the geometry of the rail track. Methods: The paper uses methods for evaluating the geometry of the rail track by track measuring cars. For the extra-curricular high speed line St. Petersburg — Moscow and for the heavy-duty line Moscow — Smolensk — Minsk, the parameters of the rail track geometry were evaluated for sections with geosynthetic materials and con-trol sections laid in the construction of the base. The summative indicator of the geometry state was the indicator of the reduced amount of deviations (PSO). Results: In the first year or two after repair, regardless of the pres-ence of geosynthetic material, the stabilization of the track is proceeding at the same pace and by the third year of operation, the level of PSO is on av-erage 4.9 pcs/km. Further, the standard design shows an increase in PSO, and by the 6th year reaches a value of 6.9 pcs/km, and then decreases, which is explained by the average repair during this period. For the rail track with geosynthetic material, the level of PSO is steadily decreasing and by the 7th — 10th year reaches a value of 3.45 pcs/km. After the fourth year of opera-tion, the average score for sections reinforced with geomaterials is no more than 85% of the average score for sections of the track without reinforce-ment. Practical significance: Stabilization of the track base with geosynthet-ic materials makes it possible to achieve uniformity of precipitation in the longitudinal axis of the path, which naturally will not lead to a significant distortion of the longitudinal profile and of course will reduce the cost of the current maintenance of the rail track by reducing the number of track rea-ligning by about half.