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Analysis of Shear Modulus(G)-Shear Strain(γ)-Degree of Saturation(S) Characteristics of Compacted Subgrade Soil used as Railway Trackbed

다짐된 궤도 흙노반 재료의 전단탄성계수(G)-전단변형률(γ)-포화도(S) 관계특성 분석

  • Choi, Chan Yong (Korea Railroad Research Institute) ;
  • Lee, Seong Hyeok (Korea Railroad Research Institute) ;
  • Lim, Yu Jin (Department of Civil, Environmental and Railroad Engineering Paichai University) ;
  • Kim, Dae Sung (Department of Civil, Environmental and Railroad Engineering Paichai University) ;
  • Park, Jae Beom (Department of Civil, Environmental and Railroad Engineering Paichai University)
  • Received : 2014.12.17
  • Accepted : 2015.02.17
  • Published : 2015.04.30

Abstract

It is important to evaluate the stiffness characteristics of compacted subgrade soil under track that is loaded dynamically. Using a mid-size Resonant Column test apparatus, normalized shear modulus and shear modulus variation with changing of confining pressure were investigated with change of degree of saturation (DOS). From an analysis of the test results, it was verified that the maximum shear modulus decreased with increases of DOS. However, normalized shear modulus increased with increases of DOS. Using the test results, a relation of G~${\gamma}$~DOS can be constructed and characterized. In the future, by performing tests with soils used as trackbed broadly in the field, a prediction model for DOS~G~${\gamma}$ can be proposed.

Acknowledgement

Supported by : 국토교통부

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