Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Evaluation of Cementation Effect of Jeju Coastal Sediments

제주연안 퇴적층의 고결 평가

  • Lee, Moon-Joo (School of Civil, Environmental, and Architectural Engrg., Korea Univ.) ;
  • Kim, Jae-Jeong (School of Civil, Environmental, and Architectural Engrg., Korea Univ.) ;
  • Shim, Jai-Beom (Samsung C&T Corporation) ;
  • Lim, Chai-Geun (RGEO Engrg. & Construction) ;
  • Lee, Woo-Jin (School of Civil, Environmental, and Architectural Engrg., Korea Univ.)
  • 이문주 (고려대학교 건축.사회환경공학부) ;
  • 김재정 (고려대학교 건축.사회환경공학부) ;
  • 심재범 (삼성물산 토목사업본부 토목ENG팀) ;
  • 임채근 (알지오이엔씨) ;
  • 이우진 (고려대학교 건축.사회환경공학부)
  • Published : 2009.11.30
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Abstract

The Jeju sand was sampled from the beach in Jeju Island and its basic properties were analyzed. The cementation effect of Jeju coastal sediments was evaluated from in-situ tests such as SPT, CPT, and the Suspension-PS test. It was shown from test results that the Jeju sand has high extreme void ratios due to the angularity of grains and the intra-particle voids of hollow particles, similar to typical calcareous sands. From cone penetration test in the calibration chamber, it was found that the cone resistance($q_c$)-relative density($D_R$)-vertical effective stress(${\sigma}_v'$) relation of Jeju sand almost matches that of high compressible quartz sand. However, the $q_C-D_R-{\sigma}_v'$ correlation suggested for uncemented Jeju sand overestimates the relative density of coastal sediments of Jeju Island due to the cementation effect. From the analysis of the relation of cone resistance, N value, and small strain shear modulus measured in-situ, it seems reasonable to assume that the coastal sediment of Jeju Island is a naturally cemented one.

본 연구에서는 제주특별자치도 강정항 인근 해역에서 채취한 해사의 기본특성을 분석하고, 실내 챔버시험으로부터 미고결 제주해사의 콘선단저항-상대밀도-연직구속압의 관계를 결정하였다. 또한 현장 표준관입시험, 콘관입시험, Suspension-PS 검층을 수행하여 제주인근 해역 퇴적층의 고결가능성을 평가하였다. 시험결과, 제주해사는 입자의 각진 정도가 크고 입자표면과 내부에 공극이 발달하여 최대, 최소간극비가 큰 탄산염 모래의 특성을 가지고 있었으며, 큰 압축성을 가진 규산염 모래와 유사한 콘선단저항 분포를 나타내었다. 그러나 미고결 제주해사의 $q_c-D_R-{\sigma}_v'$ 관계는 제주인근 해역 퇴적층의 상대밀도를 과대평가하였다. 관입시험(CPT, SPT) 결과와 Suspension-PS 시험에 의한 미소변형전단탄성계수를 비교한 결과, 제주인근 해역의 퇴적층은 고결 가능성이 매우 높은 것으로 확인되었다.

Keywords

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