چكيده به لاتين
Abstract :
Using CWR tracks has many benefits such as Increase in riding comfort, reduction of noise and decrease in maintenance cost, due to removal of the rail joints in tracks. Additionally, using this type of tracks results in increase in lateral forces, which boosts the possibility of buckling and lateral movement of the track, especially in the arches, which are considered the major disadvantages of this method.
In one hand, in the ballast layer, ballast corrosion resulting from the traffic of the rolling stock during the period of operation and on the other hand, the penetration of the fine grains from the bed, surface spillage, wind, etc, changes the grading in the ballast. With the change in the grading, the study of behavior of the ballast in the face of large lateral loads caused by temperature and instability of wagons, is inevitable. Lack of investigation of this behavior in the technical literature of lateral resistance and the ballast fouling caused us to study the lateral behavior of the track with contaminating the ballast in different levels and the combined effects of moisture with it altogether. in order to do this by choosing clay fouling as fine grain and sand as coarse grain and contaminating the ballast layer up to 5%, 10%, 15% and 20% with these fouling materials and by changing the moisture of every level of fouling up to 5%, 10%, 15% and 20%, we studied the combined effects of fouling, the type of fouling and the moisture altogether. In the laboratory tests carried out, using the results of the single tie push test, we concluded that increased moisture has an opposite effect on the lateral resistance. Whereas an increase in the amount of fouling of the samples increases the amount of the lateral resistance. Moreover, with an increase in the fouling of the sample, the lowering effect of moisture on the lateral resistance will be lowered.
Keywords: Lateral resistance, Fouling index, Ballast contamination, Clay, Sand, Moisture, Single tie push test, STPT.
