چكيده به لاتين
Abstract
The railway lines and its infrastructure are the largest railways capital, with a significant percentage of their annual budget being spent on their maintenance. In the meantime, the use of new methods to fix defects and maintaining the initial geometric shape of the lines, has a significant effect on earning revenue and a direct cost savings, and in addition, it can increase the safety factor for the movement of trains. For this reason, the railways must be carefully evaluated and monitored for their correct and safe operation.
Various factors can contribute to improving the geometric quality of the railways. One of the technologies that can make a difference in this is the use of the UPS under Traversal (USP). To investigate this, the effect of using this material was evaluated using numerical simulation and field test results. In this study, a linear modeling of the PLAXIS 2D software was performed for numerical evaluation of elastic pads under traverse. Based on the results obtained from the model analysis, the increase in the modulus of elasticity of the USP (hardening of the pad) will reduce the displacement of the line components. Also, reducing the thickness of the pad will reduce the line displacement and decrease the elasticity of the USP.
In the next step, in order to investigate the effect of USP on the changes in the geometric indices of the railway line, the midstream-spa block was selected from the north-east. By examining the area below, the graph of the variation of the geometric parameters of the line as well as the standard deviation (SD) of the parameters of the changes were studied before the installation of the USP, as well as in successive turns after the installation of USP. The results demonstrate the positive impact of using USPs on improving the geometric quality of the line.
Keywords: Railway Ballasts, Elastic Pads under Traverse (USP), Linear Geometric Parameters, Geometric Standard Deviation Index.
