Relationship between Stiffness and Shear Strength of Normally Consolidated Clay using Triaxial Compression Tests and Shear Wave Measurements

삼축압축시험과 전단파 계측을 이용한 정규압밀 점성토의 강성도와 전단강도의 상관관계

  • Oh, Sang-Hoon (Dept. of Civil Engineering, Kyung-Hee University) ;
  • Kim, Hak-Sung (Dept. of Civil Engineering, Kyung-Hee University) ;
  • Kim, Eun-Jung (Dept. of Civil Engineering, Kyung-Hee University) ;
  • Park, In-Beom (Dept. of Civil Engineering, Kyung-Hee University) ;
  • Mok, Young-Jin (Dept. of Civil Engineering, Kyung-Hee University)
  • Published : 2008.10.10

Abstract

Thanks to a new in-situ seismic probe, using bender elements and penetration scheme, a simple linear relationship between undrained shear strength(Cu) and shear wave velocity(Vs) was obtained. This priceless relationship is worthy to be illuminated further in ideal laboratory environment. To avoid sampling disturbance effect, special consolidation cylinders were used to make normally consolidated specimens from kaolinite suspension. The undrained shear strengths of the specimens were measured using unconsolidated undrained triaxial compression tests. Also shear wave velocity measurements were performedprior to shearing the same specimens, using the bender elements installed in the base pedestal and the top cap of the triaxial compression cell. The Cu-Vs relationship is fairly linear and supports the linear trend of clayey silt obtained using field testing. Also the classic density-shear modulus relationship for soft clay proposed by Hardin and Black(1969) was once more verified hereby.

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