A deep investigation into the mechanisms and factors producing …
WEBJan 1, 2023 · When enough moisture is present at the track surface, it forms a mud slurry during train operations that creates mud pumping, in which the mud slurry from fines surrounds the ties and pushes away the ballast particles.
Experimental assessment of geotextile serviceability lifetime as ...
WEBJun 30, 2019 · In this research, the main goal is investigation of the clogging phenomenon of geotextile, as a separator material between the ballast and subgrade of railway track. Firstly, a Slurry Pumping Simulator Apparatus (SPSA) has been developed.
The mechanism and effects of subgrade fluidisation under ballasted ...
WEBMay 28, 2020 · It was apparent that increasing the amount of slurry (i.e., mud pumping) inside the ballast reduced its friction and bearing capacity, as shown in the previous sections, and this led to an increase in the deformation of ballast track.
MUD PUMPING UNDER RAILTRACKS: MECHANISMS, ASSESSMENTS AND SOLUTIONS
WEBDec 1, 2019 · Increasing the thickness of ballast or renewing the subgrade (slurry) are expensive, but they are currently used in practice due to the simplicity and long-life effectiveness (Transport for NSW...
Remediation of Mud Pumping on a Ballasted Railway Track
WEBJan 1, 2016 · A combination of subgrade material moving into the ballast and ballast sinking into the soft subgrade, can lead to voiding below the sleepers, increased track deflection and erratic, localized, dynamic loads which exacerbate the problem. In most cases where clay/silt subgrades are present, mud pumping does not occur.
Shoulder ballast cleaning shows its worth - International Railway …
WEBMar 18, 2024 · Stephen Wilk, principal investigator with MxV Rail, explains how drainage improvement methods such as spot shoulder ballast cleaning may slow the deterioration of the track structure from mud spots and extend the time before full ballast replacement from undercutting is required.
A Deep Investigation into the Mechanisms and Factors Producing …
WEBNov 1, 2022 · Ballast degradation and mud pumping are common issues facing all railroads in which slurry within the ballast pumps up around the surface of the track during train operations. This often...
(PDF) The mechanism and effects of subgrade fluidisation under ...
WEBRailway ballast comprises unbounded discrete grains that are often used to form a load-bearing platform for tracks. Ballast degradation as trains pass over the tracks and infiltration of external fines including slurried (pumped) fine subgrade soils are two of the main reasons for ballast fouling.
Sustainability of the Ballasted Track – A Comprehensive Review on ...
WEBOct 28, 2018 · Nonetheless, ballast grains lose mass due to abrasion, which results in contamination of the layer and differential settlings of the track. Problems also emerge when the railway is constructed without sub-ballast, a blocking and filtering layer located between ballast and subgrade.
WEBGEOSNTHETICS IN RAILWAYS: Applications Beneflts causes the particles to form a slurry. As the ballast dilates, the slurry moves into the void. The slurry is then pumped upwards as the ballast contracts. This rapid, cyclical effect causes the mobile clay/ silt particles to be forced progressively up into the ballast.