Proceedings of the Korean Geotechical Society Conference (한국지반공학회:학술대회논문집)

Korean Geotechnical Society (한국지반공학회)
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Disturbance Effects of Field $V_S$ Probe

현장 전단파 속도 프로브의 교란효과

  • Yoon, Hyung-Koo (Department of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Lee, Chang-Ho (Department of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Lee, Woo-Jin (Department of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Lee, Jong-Sub (Department of Civil, Environmental and Architectural Engineering, Korea University)
  • 윤형구 (고려대학교 건축.사회환경공학과) ;
  • 이창호 (고려대학교 건축.사회환경공학과) ;
  • 이우진 (고려대학교 건축.사회환경공학과) ;
  • 이종섭 (고려대학교 건축.사회환경공학과)
  • Published : 2008.03.28
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Abstract

The shear wave velocity ($V_s$) has been commonly used to evaluate the dynamic properties of soil. The field $V_s$ probe (FVP) was already developed to assess the shear stiffness of a soft clay. The objective of this study is to investigate the disturbance effects of the FVP due to the penetration. The laboratory tests are conducted in a large-scale consolidometer (calibration chamber). The reconstituted clay is mixed at the water content of 110% using a slurry mixer. The FVP and down-hole test are carried out every 1cm interval to compare the data. In addition, two square rods with transducers are also implemented to get the reference value. The shear waves evaluated by the FVP, dow-hole tests, and reference rods are closely matched. This study suggests that the disturbance effect of the FVP due to the penetration into the soft clay soils is small enough and the $V_s$ evaluated by the FVP reflects well the in-situ characteristics. Furthermore, the combination of the FVP and down-hole test shows the possibility of hybrid equipment.

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