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http://dx.doi.org/10.7782/JKSR.2012.15.5.476

Evaluation of Dynamic Properties of Crushed Stones Used as Reinforced Trackbed Foundation Materials Using Midsize Resonant Column Test apparatus  

Lim, Yujin (Department of Civil, Environmental and Railroad Engineering, PaiChai University)
Lee, SeongHyeok (Korea Railroad Research Institute)
Lee, Jinwoog (Korea Railroad Research Institute)
Cho, Hojin (Department of Civil, Environmental and Railroad Engineering, PaiChai University)
Publication Information
Journal of the Korean Society for Railway / v.15, no.5, 2012 , pp. 476-484 More about this Journal
Abstract
In this study, a mid-size RC test apparatus equipped with analyzing program is developed that can test samples up to D=10cm diameter and H=20cm height which is larger than usual samples of D=5cm and H=10cm used mostly in practice. Thus, crushed stones with larger grains up to 38mm in diameter used mostly in Korea as reinforced trackbed materials in track construction could be considered effectively than conventionally used RC apparatus for evaluation of the dynamic properties of the materials by using the newly developed RC apparatus. The RC test apparatus was designed and assembled based on the concept of fixed-free fixity conditions and driving mechanism proposed by Stokoe. Using the developed RC test apparatus, three types of representative crushed reinforced trackbed materials were tested in order to get the dynamic properties of the materials such as $G/G_{max}$ reduction curves and damping ratio D. For comparison purpose, a small RC test apparatus has been used to test the same materials.
Keywords
Mid-size resonant column test; Dynamic properties; Shear modulus; Reinforced trackbed materials; Damping ratio;
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