Development and Application of Penetration Type Field Shear Wave Apparatus

관입형 현장 전단파 측정장치의 개발 및 적용

  • Lee, Jong-Sub (Dept. of Civil and Environmental Engrg., Korea Univ.) ;
  • Lee, Chang-Ho (Dept. of Civil and Environmental Engrg., Korea Univ.) ;
  • Yoon, Hyung-Koo (Dept. of Civil and Environmental Engrg., Korea Univ.) ;
  • Lee, Woo-Jin (Dept. of Civil and Environmental Engrg., Korea Univ.) ;
  • Kim, Hyung-Sub (Busan New Port North Terminal Project, Samsung Corporation)
  • 이종섭 (고려대학교 사회환경시스템공학과) ;
  • 이창호 (고려대학교 사회환경시스템공학과) ;
  • 윤형구 (고려대학교 사회환경시스템공학과) ;
  • 이우진 (고려대학교 사회환경시스템공학과) ;
  • 김형섭 (삼성물산 건설부문, 부산신항 북컨 2단계 현장)
  • Published : 2006.12.31


The reasonable assessment of the shear stiffness of a dredged soft ground and soft clay is difficult due to the soil disturbance. This study addresses the development and application of a new in-situ shear wave measuring apparatus (field velocity probe: FVP), which overcomes several of the limitations of conventional methods. Design concerns of this new apparatus include the disturbance of soils, cross-talking between transducers, electromagnetic coupling between cables, self acoustic insulation, the constant travel distance of S-wave, the rotation of the transducer, directly transmitted wave through a frame from transducer to transducer, and protection of the transducer and the cable. These concerns are effectively eliminated by continuous improvements through performing field and laboratory tests. The shear wave velocity of the FVP is simply calculated, without any inversion process, by using the travel distance and the first arrival time. The developed FVP Is tested in soil up to 30m in depth. The experimental results show that the FVP can produce every detailed shear wave velocity profiles in sand and clay layers. In addition, the shear wave velocity at the tested site correlates well with the cone tip resistance. This study suggests that the FVP may be an effective technique for measuring the shear wave velocity in the field to assess dynamic soil properties in soft ground.


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