Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Proposal of Predictive Equations of Normalized Shear Modulus and Damping Ratio Curves for Loose Medium Sand Reinforced by Vinyl Strip-cement

비닐스트립-시멘트로 보강된 느슨한 중간 모래의 정규화 전단탄성계수 및 감쇠비 곡선 산정식 제안

  • Kim, Jong-Min (Dept. of Civil and Environmental Engrg., Sejong Univ.)
  • 김종민 (세종대학교 건설환경공학과)
  • Received : 2021.11.16
  • Accepted : 2021.12.09
  • Published : 2021.12.31
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Abstract

In this study, predictive equations of the normalized shear modulus and the damping ratio curves for loose medium sands reinforced by vinyl strip-cement are proposed. Based on the results of a series of resonant-column tests (Yu, et al., 2018) conducted under the confining stresses of 15, 30, 60 kPa on sand specimens prepared with 40% relative density and reinforced by various contents of vinyl strip (0.0, 0.1, 0.3, 0.4%) and cement (0, 1, 2%), the equations estimating the normalized shear modulus and the damping ratio are proposed as functions of reinforcing conditions and confining stresses. The comparison between predicted and measured values of shear modulus and damping ratio shows a good agreement and the reliability of proposed predictive equations are validated by high R2-value greater than 0.9. Therefore, it is expected that the time and the cost required for constructing the normalized shear modulus and the damping ratio curves will be much reduced by using proposed equations in this study since those can easily be estimated without conducting resonant-column test.

본 연구에서는 비닐스트립-시멘트로 보강된 느슨한 중간 모래의 정규화 전단탄성계수 및 감쇠비 산정식을 제안하였다. 상대밀도 40%의 모래시편을 다양한 비닐스트립 혼합비(0.0, 0.1, 0.3, 0.4%)와 시멘트 혼합비(0, 1, 2%)로 보강한 후 15, 30, 60kPa의 구속압조건에서 수행한 공진주시험 자료(Yu, et al., 2018)를 분석하여 정규화 전단탄성계수와 감쇠비 산정식을 보강조건과 구속압조건의 함수로 제안하였다. 제안된 산정식을 적용한 결과와 시험결과를 비교한 결과 결정계수 0.9 이상의 높은 신뢰도를 보여주었다. 본 연구에서 제안된 산정식을 이용하면 비닐스트립-시멘트로 보강된 느슨한 중간모래의 전단탄성계수와 감쇠비를 공진주시험 수행없이 간단히 산정할 수 있어 시간과 비용이 절감될 것으로 기대한다.

Keywords

Acknowledgement

본 연구는 한국연구재단 기본연구지원사업(NRF-2010-0013408)의 지원에 의해 수행되었으며, 시험자료를 제공해 준 유정민 박사께 감사드립니다.

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