Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Stress-Dependent Failure Criteria for Marine Silty Sand Subject to Cyclic Loading

반복하중을 받는 해양 실트질 모래의 응력기반 파괴기준

  • Ryu, Tae Gyung (Dept. of Civil and Environmental Engrg., Pusan National Univ.) ;
  • Kim, Jin Man (Dept. of Civil and Environmental Engrg., Pusan National Univ.)
  • 류태경 (부산대학교 사회환경시스템공학과) ;
  • 김진만 (부산대학교 사회환경시스템공학과 토목공학전공)
  • Received : 2015.07.01
  • Accepted : 2015.10.13
  • Published : 2015.11.30
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Abstract

An experimental study has been conducted to evaluate the effects of average and cyclic shear stresses on the undrained failure behaviors of dense marine silty sand by using the Cyclic Direct Simple Shear apparatus. The results show that when the average shear stress ratio is zero, symmetric cyclic shear deformation is the major component of deformation, and permanent shear deformation is relatively small. On the other hand, when the average shear stress ratio is larger than zero, asymmetric permanent shear deformation is the major component, and cyclic shear deformation does not change much as the number of cyclic loads increases. The average shear stress ratio has less effects on the number of cyclic loads needed to fail, as compared with the cyclic shear stress ratio. The proposed stress-dependent failure contour can effectively be used to assess the cyclic shear strength of soil beneath the foundation for the design of offshore structures.

반복단순전단시험기를 사용하여 조밀한 해양실트질 모래의 비배수 파괴거동에 대한 평균전단응력과 반복전단응력의 영향을 평가하였다. 시험결과는 평균전단응력비가 0인 경우는 비교적 좌우 대칭형태의 반복전단변형률이 주된 변형모드였으며 영구전단변형률은 상대적으로 작게 발생하였다. 평균전단응력비가 0이상인 경우는 반복횟수가 증가함에 따라 주로 한 방향으로 영구전단변형률이 증가하고 반복전단변형률은 거의 변화가 없었다. 평균전단응력비는 응력-변형률 거동에 상당한 영향을 보였으나, 파괴에 필요한 반복하중횟수 등에 대한 영향이 반복전단응력비에 비해 상대적으로 적었다. 본 논문에서 제안한 응력기반 파괴기준은 해양구조물 설계 시 기초 하부 지반의 반복전단강도를 평가하는 데 효과적으로 사용될 수 있다.

Keywords

References

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