The Influence of Sand Composition on Railway Track Pumping and Deformation in Winter Period

Abstract

The current standards for the effective pore diameter in geotextile materials both in Russia and in other countries have been determined by the techniques using natural sands of certain composition. However, particles that fall into geotextiles from railway ballast differ in form from natural sands. Thus, the existing requirements for the diameter of geotextile filtration passages need to be corrected. The calculation methodology for determining the possibility of colmated layers in sands is described. The requirements for the size of geotextile filtration passages preventing them from colmatage and ensuring the preservation of their filtration properties within the required limits throughout the standard service life are presented. In case of non-compliance with the requirements for sands, colmated layers will occur in them, which will lead in pumping.