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Influence of moisture content on shear behavior of differently aged ballast mixture

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Pubblicato in:E3S Web of Conferences vol. 642 (2025)
Autore principale: Bhardwaj, Sparsh
Altri autori: Ishikawa, Tatsuya, Nakamura, Takahisa
Pubblicazione:
EDP Sciences
Soggetti:
Fines
Plastic deformation
Field tests
Moisture content
Suction
Shear strength
Matric suction
Drainage
Compression tests
Mechanical properties
Aging
Mixtures
Field investigations
Railroad ballast
Attrition
Water content
Triaxial compression tests
Railway tracks
Environmental
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Abstract:Ballasted tracks are the most common railway tracks worldwide, consist of coarse aggregates (19-63 mm) that facilitate drainage. Over time, ballast particles degrade due to train-induced attrition and abrasion, generating fines that clog voids and reduce drainage efficiency. Increased moisture further leads to cyclic plastic deformation. This study examines the mechanical behavior of differently aged ballast mixture under monotonic triaxial compression tests in three moisture conditions viz. air-dried, saturated, and unsaturated (matric suction= 5 kPa) to study the mechanical behavior of in-situ railroad ballast. Field investigations on Indian Railways show that tracks typically contain 80-90% clean ballast (CB) and 10-20% aged ballast (AB). A test mixture (MIX 1) with 90% CB and 10% AB was used to analyse shear behavior. Results reveal that aging significantly weakens shear strength, especially in saturated and unsaturated conditions, highlighting that both aging and moisture negatively affect ballast performance, making drainage and stability are crucial for track integrity.
ISSN:2555-0403
2267-1242
DOI:10.1051/e3sconf/202564203003
Fonte:Engineering Database