Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Shear Wave Velocity Estimation of Railway Roadbed Using Dynamic Cone Penetration Index

동적 콘 관입지수를 이용한 철도노반의 전단파속도 추정

  • Hong, Won-Taek (School of Civil, Environmental and Architectural Engrg., Korea Univ.) ;
  • Byun, Yong-Hoon (Dept. of Civil and Environmental Engrg., Univ. of Illinois at Urbana-Champaign) ;
  • Choi, Chan Yong (High Speed Research Division, Korea Railroad Research Institute) ;
  • Lee, Jong-Sub (School of Civil, Environmental and Architectural Engrg., Korea Univ.)
  • 홍원택 (고려대학교 건축사회환경공학부) ;
  • 변용훈 (일리노이대학교 사회환경공학과) ;
  • 최찬용 (한국철도기술연구원 고속철도연구본부) ;
  • 이종섭 (고려대학교 건축사회환경공학부)
  • Received : 2015.07.30
  • Accepted : 2015.09.30
  • Published : 2015.11.30

Abstract

Elastic behavior of the railway roadbed which supports the repeating dynamic loads of the train is mainly affected by the shear modulus of the upper roadbed. Therefore, shear wave velocity estimation of the uniformly compacted roadbed can be used to estimate the elastic behavior of the railway roadbed. The objective of this study is to suggest the relationship between the dynamic cone penetration index (DCPI) and the shear wave velocity ($V_s$) of the upper roadbed in order to estimate the shear wave velocity by using the dynamic cone penetration test (DCPT). To ensure the reliability of the relationship, the dynamic cone penetration test and the measurement of the shear wave velocity are conducted on the constructed upper roadbed. As a method for measurement of the shear wave velocity, cross hole is used and then the dynamic cone penetration test is performed at a center point between the source and the receiver of the cross hole. As a result of the correlation of the dynamic cone penetration index and the shear wave velocity at the same depths, the shear wave velocity is estimated as a form of involution of the dynamic cone penetration index with a determinant coefficient above 0.8. The result of this study can be used to estimate both the shear wave velocity and the strength of the railway roadbed using the dynamic cone penetrometer.

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Acknowledgement

Supported by : 국토교통부

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