Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Relative Density and Stress-Dependent Failure Criteria of Marine Silty Sand Subjected to Cyclic Loading

반복하중을 받는 해양실트질 모래의 상대밀도에 따른 응력기반 파괴기준

  • Ko, Min Jae (Dept. of Civil and Environmental Engrg., Pusan National Univ.) ;
  • Son, Su Won (Dept. of Civil and Environmental Engrg., Pusan National Univ.) ;
  • Kim, Jin Man (Dept. of Civil and Environmental Engrg., Pusan National Univ.)
  • 고민재 (부산대학교 사회환경시스템공학과) ;
  • 손수원 (부산대학교 사회환경시스템공학과) ;
  • 김진만 (부산대학교 사회환경시스템공학과 토목공학전공)
  • Received : 2016.12.30
  • Accepted : 2017.01.19
  • Published : 2017.01.31
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Abstract

An experimental study has been conducted by using the Cyclic Direct Simple Shear apparatus to evaluate the influence of average and cyclic shear stresses on the undrained shear failure behavior of marine silty sand considering various relative densities. The obtained results show that despite using different relative densities, similar trends were gained in the cyclic shear deformation. Moreover, the cyclic shear deformation is affected mainly by the average and cyclic shear stresses. The number of cyclic loads for failure is significantly affected by the cyclic shear stress ratio and relative density, and is less affected by the average shear stress ratio. The proposed three-dimensional stress-dependent failure contour can be used effectively to assess the soil shear strength considering various relative densities in the design of foundation used for offshore structures.

반복단순전단시험기를 이용하여 해양실트질 모래의 상대밀도 변화에 따른 비배수전단파괴 거동에 대해 평균전단응력과 반복전단응력이 미치는 영향을 평가하였다. 시험결과 반복전단 변형모드는 상대밀도가 달라지더라도 유사한 양상을 보였으며, 평균전단응력과 반복전단응력으로부터 큰 영향을 받았다. 파괴에 필요한 반복하중 횟수는 반복전단응력비, 상대밀도, 그리고 평균전단응력비의 순서로 좌우되는 것으로 나타났다. 본 논문에서는 조밀한 지반과 느슨한 지반에서 상대밀도 변화에 따른 응력기반 파괴경로의 변화를 2차원과 3차원으로 제시하였으며, 3차원 파괴선도는 조밀한 지반 조건에 대해서만 한정된 한계점을 보완하여 지반의 상대밀도에 따라 반복전단응력비, 평균전단응력비, 반복하중 횟수 등의 설계 조건을 결정 할 수 있는 아주 유용한 설계도구로 활용 가능하다.

Keywords

References

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