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Ground Improvement For Transport Infrastructure: Geosynthetic Inclusions For Enhanced Ballasted Rail Tracks, Buddhima Indraratna, Ngoc Trung Ngo, Fernanda Bessa Ferreira, Cholachat Rujikiatkamjorn
Ground Improvement For Transport Infrastructure: Geosynthetic Inclusions For Enhanced Ballasted Rail Tracks, Buddhima Indraratna, Ngoc Trung Ngo, Fernanda Bessa Ferreira, Cholachat Rujikiatkamjorn
Faculty of Engineering and Information Sciences - Papers: Part B
Given the increasing demand for trains to carry heavier loads, current Australian ballasted rail networks require a significant amount of upgrading. Railroad ballast is an unbounded granular material that displaces laterally when subjected to repeated train loading. During track operations, ballast deteriorates due to progressive breakage and the infiltration of fine particles or mud-pumping from the underneath layers (e.g., capping, subgrade), which decreases the shear strength, impedes track drainage and increases the deformation of ballasted tracks. Rail track substructures can be reinforced by geosynthetics to reduce lateral displacements and optimise overall track performance. This paper presents the current state-of-the-art knowledge …
Coupled Dem-Fem Analysis For Simulating Ballasted Rail Tracks, Ngoc Trung Ngo, Buddhima Indraratna, Cholachat Rujikiatkamjorn
Coupled Dem-Fem Analysis For Simulating Ballasted Rail Tracks, Ngoc Trung Ngo, Buddhima Indraratna, Cholachat Rujikiatkamjorn
Faculty of Engineering and Information Sciences - Papers: Part B
Ballasted tracks play an essential role in its economy through transporting freight and bulk commodities between major cities and ports, and carrying passengers, particularly in urban areas. Ballast usually consists of hard and strong angular particles, which are derived from high strength unweathered rocks. Ballast aggregates undergo gradual and continuing degradation under cyclic train loadings. In this study, the load-deformation responses of ballasted rail tracks subjected to cyclic loading are studied experimentally using a large-scale Track Process Simulation Apparatus (TPSA), and numerically through a coupled discrete-continuum approach, namely, coupled DEM-FEM. Laboratory tests are carried out to examine the deformation and …