DOI QR코드

DOI QR Code

OCR evaluation of cohesionless soil in centrifuge model using shear wave velocity

  • Cho, Hyung Ik (Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Sun, Chang Guk (Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Jae Hyun (Department of Infrastructure Safety Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Kim, Dong Soo (Department of Civil Engineering, Korean Advanced Institute of Science and Technology)
  • 투고 : 2017.06.21
  • 심사 : 2018.01.08
  • 발행 : 2018.07.20

초록

In this study, a relationship between small-strain shear modulus ($G_{max}$) and overconsolidation ratio (OCR) based on shear wave velocity ($V_S$) measurement was established to identify the stress history of centrifuge model ground. A centrifuge test was conducted in various centrifugal acceleration levels including loading and unloading sequences to cause various stress histories on centrifuge model ground. The $V_S$ and vertical effective stress were measured at each level of acceleration. Then, a sensitivity analysis was conducted using testing data to ensure the suitability of OCR function for the tested cohesionless soils and found that OCR can be estimated based on $V_S$ measurements irrespective of normally-consolidated or overconsolidated loading conditions. Finally, the developed $G_{max}$-OCR relationship was applied to centrifuge models constructed and tested under various induced stress-history conditions. Through a series of tests, it was concluded that the induced stress history on centrifuge model by compaction, g-level variation, and past overburden load can be analysed quantitatively, and it is convinced that the OCR evaluation technique will contribute to better interpret the centrifuge test results.

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과제정보

연구 과제 주관 기관 : Korea Institute of Geoscience and Mineral Resources (KIGAM), National Research Foundation of Korea (NRF)

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