Track lateral stability tests performed in CEDEX Track Box and their modelling
DOI:
https://doi.org/10.24849/j.geot.2017.140.01Keywords:
railway, lateral stability tests, laboratory, modellingAbstract
Some track lateral stability tests were performed in CEDEX Track Box (CTB) with the aid of a special tool built for that purpose that pushes away the sleeper while its movement is recorded. The lateral resistance of the sleeper is due to three mechanisms: the friction in the sleeper base with the ballast, the friction in the sleeper lateral faces with the ballast and the passive and active resistances of ballast in the sleeper shoulders. To quantify those mechanisms according to Soil Mechanic laws, the ballast shear strength was previously determined in large direct shear tests (in a 1x1x1 m shear box). The large size of that test equipment makes it possible to test ballast in its real size. Furthermore, in some of those tests the ballast was fouled with fine and uniform sand to reproduce the effect of adverse environmental conditions (e.g. a sand storm) in desert high speed lines.
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