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http://dx.doi.org/10.7843/kgs.2013.29.10.57

Dynamic Change of Stresses in Subsoil under Concrete Slab Track Subjected to Increasing Train Speeds  

Lee, Tae-Hee (Graduate Student, Dept. of Civil Eng., Kyung Hee Univ.)
Choi, Chan-Yong (Korea Railload Research Institute)
Nsabimana, Ernest (Graduate Student, Dept. of Civil Eng., Kyung Hee Univ.)
Jung, Young-Hoon (Dept. of Civil Eng., Kyung Hee Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.29, no.10, 2013 , pp. 57-66 More about this Journal
Abstract
Societal interest on a faster transportation demands an increase of the train speed exceeding current operation speed of 350 km/h. To trace the pattern of variations in displacements and subsoil stresses in the concrete slab track system, finite element simulations were conducted. For a simple track-vehicle modeling, a mass-point system representing the moving train load was developed. Dynamic responses with various train speeds from 100 to 700 km/h were investigated. As train speeds increase the displacement at rail and subsoil increases nonlinearly, whereas significant dynamic amplification at the critical velocity has not been found. At low train speed, the velocity of elastic wave carrying elastic energy is faster than the train speed. At high train speed exceeding 400 km/h, however, the train speed is approximately identical to the elastic wave velocity. Nonlinearity in the stress history in subsoil is amplified with increasing train speeds, which may cause significant plastic strains in path-dependent subsoil materials.
Keywords
Critical velocity; Dynamic analysis; Train speed; Concrete Slab Track; Nonlinearity;
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Times Cited By KSCI : 1  (Citation Analysis)
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