Abstract
This paper highlights recent laboratory studies at Emperor Alexander I St. Petersburg State Transport University, using large-scale cylindrical triaxial apparatus, which helped quantify the geogrid performance in railway ballast. The triaxial shear strength tests were conducted on ballast with and without geogrid. Effect of geogrid layers quantity on the ballast stress-strain behaviour were studied. The experimental results indicate that the geogrids have improved ballast bearing capacity up to 25%.
Highlights
Ballast and soil of the railway roadbed-working zone are in a complex stress state under three-axis compression caused by the influence of rolling stock, natural factors and forces from its own weight
It is necessary to study the main relationships between the stresses and strains of stabilized soil under three-axis compression to create the methods for calculating the deformation and strength appeared in the roadbed
A large-scale ballast tests were carried out using a large cylindrical three-axis compression device with a natural particle size sample
Summary
Ballast and soil of the railway roadbed-working zone are in a complex stress state under three-axis compression caused by the influence of rolling stock, natural factors and forces from its own weight. The analysis of the conducted studies of ballast materials mechanical properties shows the increasingly important role of the materials strength and deformation characteristics accurate determination under three-axis compression [1,2,3]. These parameters are used in a number of modern applied software packages for sleeper bearing behaviour calculations and modelling as input data [4,5,10]. With the ratio of sample height to diameter at least 2 To overcome this problem, a large-scale ballast tests were carried out using a large cylindrical three-axis compression device with a natural particle size sample
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