Open AccessRESEARCH OF RAILWAY AGGREGATE SUB-BALLAST MIXTURE PROPERTIES / GELEŽINKELIO POBALASTINIO SLUOKSNIO IŠ UŽPILDŲ MIŠINIO SAVYBIŲ TYRIMAS
Author(s) -
Deividas Navikas,
Henrikas Sivilevičius
Publication year - 2016
Publication title -
mokslas - lietuvos ateitis
Language(s) - English
Resource type - Journals
eISSN - 2029-2341
pISSN - 2029-2252
DOI - 10.3846/mla.2015.818
Subject(s) - ballast , gradation , engineering , drainage , mathematics , geotechnical engineering , electrical engineering , computer science , ecology , computer vision , biology
Railway sub-ballast layer is a connecting layer between the ballast and other track layers. This layer must ensure even load distribution into the subgrade, drainage surface water, prevent materials of layers mixing. Ensuring these properties allows to extend the explotation of all railway road construction and geometrical parameter of road maintenance. This article analyzes investigated railway sub-ballast mixture properties from large sample sizes (n = 49): gradation, water permeability and density statistical parameters. The regression equation showing the relationship between the fully percent passing through sieves averages and standard deviations is presented. Her coefficient of determination (R2 = 0.909). The minimum number of representative samples of these three properties research is determined. Irregularity in most cases of water permeability (ν = 88,3%), depending on the laboratory tests methodology errors, is indicated