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http://dx.doi.org/10.7843/kgs.2018.34.2.55

Stiffness Characterization of Subgrade using Crosshole-Type Dynamic Cone Penetrometer  

Hong, Won-Taek (School of Civil, Environmental and Architectural Engrg., Korea Univ.)
Choi, Chan Yong (Advanced Infrastructure Research Team, Korea Railroad Research Institute)
Lim, Yujin (Dept. of Civil, Environmental and Railroad Engrg., Paichai Univ.)
Lee, Jong-Sub (School of Civil, Environmental and Architectural Engrg., Korea Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.34, no.2, 2018 , pp. 55-63 More about this Journal
Abstract
In order to support the load of the train with enough stiffness, a study on an effective method for the characterization of the stiffness of the compacted subgrade is required. In this study, the crosshole-type dynamic cone penetrometer (CDCP) is used for the stiffness characterization of the subgrade along the depth. For the application of the CDCP test, three points of compacted subgrades are selected as the study sites. For the study sites, CDCP test, in-situ density test, and light falling weight deflectometer (LFWD) test are conducted. As the results of CDCP tests, shear wave velocity profiles are obtained by using the travel times and the travel distances of the shear waves along the depth. In addition, maximum shear modulus ($G_{max}$) profiles are estimated by using the density of the subgrades and the shear wave velocity profiles. The averaged maximum shear moduli at each testing point are highly correlated with the dynamic deflection moduli ($E_{vd}$) determined by LFWD tests. Therefore, a reliable stiffness characterization of the subgrade can be conducted by using CDCP tests. In addition, because CDCP characterizes the stiffness of the subgrade along the depth rather than a representative value, CDCP test may be effectively used for the stiffness characterization of the subgrade.
Keywords
Crosshole-type dynamic cone penetrometer; Light falling weight deflectometer; Maximum shear modulus; Shear wave velocity; Subgrade;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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