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Effectiveness of Reinforcement for Transitional Zone between Tunnel and Earthwork Using the Large Sleeper  

Choi, Chan-Yong (한국철도기술연구원 철도구조연구실)
Lee, Jin-Wook (한국철도기술연구원 철도구조연구실)
Kim, Hun-Ki (한국철도기술연구원 철도구조연구실)
Publication Information
Journal of the Korean Society for Railway / v.13, no.2, 2010 , pp. 214-221 More about this Journal
Abstract
The transitional zone between tunnel and earthwork is one of the most vulnerable areas site for railway lines and because of differential settlement due to different stiffness of each supporting layer, it has to conducted a maintenance work constantly. In this study, it is conducted to compare the effect of reinforcement by wheel load and displacement of the sleepers after existing sleepers are replaced with the large sleepers for 20m long in-field transitional zone. Also, numerical parametric study using multi-layer elastic method has been performed to compare rail force, settlement and stresses of ballast while varying size and space of the sleeper. The field test and numerical results show that replacing the large sleepers improves about 10% of total settlement and coefficient of wheel force than conventional sleepers. Effectiveness of improvement is about 9.3%, 4%, 14.5% for rail seat force, settlement of sleepers and ballast pressure respectively with size of sleepers.
Keywords
Transitional zone; Wheel load; Displacement; Large sleeper;
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Times Cited By KSCI : 3  (Citation Analysis)
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