Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Analysis of Influencing Factors on Strength Characteristics of Cemented Sand

고결모래의 강도특성에 대한 영향요인 분석

  • Lee, Moon-Joo (Dept. of Civil, Environmental, and Architectural Engrg., Korea Univ.) ;
  • Choi, Sung-Kun (Dept. of Civil, Environmental, and Architectural Engrg., Korea Univ.) ;
  • Choo, Hyun-Wook (Dept. of Civil, Environmental, and Architectural Engrg., Korea Univ.) ;
  • Cho, Yong-Soon (Dept. of Civil, Environmental, and Architectural Engrg., Korea Univ.) ;
  • Lee, Woo-Jin (Dept. of Civil, Environmental, and Architectural Engrg., Korea Univ.)
  • 이문주 (고려대학교 건축.사회환경공학과) ;
  • 최성근 (고려대학교 건축.사회환경공학과) ;
  • 추현욱 (고려대학교 건축.사회환경공학과) ;
  • 조용순 (고려대학교 건축.사회환경공학과) ;
  • 이우진 (고려대학교 건축.사회환경공학과)
  • Published : 2007.12.31
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Abstract

The effects of sitting pressure(${\sigma_{sit}}'$) during cementation, relative density and particle characteristics on the cohesion intercept due to cementation bonds and the confining stress inducing the breakage of cementation bonds ${p_i}'_{(BP)}$ are investigated from drained shear tests on the cemented sands confined under the isotropic stress up to 400 kPa. It was observed from the experimental results that the cemented sands, with the same density and gypsum content, show similar values of cohesion intercept and ${p_i}'_{(BP)}$, regardless of ${\sigma_{sit}}'$. Although the cohesion intercept and ${p_i}'_{(BP)}$ of cemented sands are observed to increase with increasing relative density and cementation level, the relative density appears to have more significant effect on ${p_i}'_{(BP)}$ than the cohesion intercept does. From analysing the test results of three different sands, it is shown that the smaller the particle size the larger the cohesion intercept and ${p_i}'_{(BP)}$, due to the increased number of contact points between the particles.

본 연구에서는 고결시 상재구속압(${\sigma_{sit}}'$), 상대밀도, 그리고 입자특성이 고결모래의 점착력과 고결결합 파괴구속압(${p_i}'_{(BP)}$)에 미치는 영향을 검토하기 위하여 400kPa 까지의 구속압으로 압밀된 고결모래에 대한 배수전단시험을 실시하였다. 시험결과 동일 상대밀도와 석고함유율로 고결된 모래의 점착력과 ${p_i}'_{(BP)}$는 ${\sigma_{sit}}'$에 관계없이 동일하게 결정되어, ${\sigma_{sit}}'$이 고결모래의 강도특성에 미치는 영향은 상대적으로 적은 것으로 나타났다. 반면, 상대밀도나 고결정도가 증가할수록 고결모래의 점착력과 ${p_i}'_{(BP)}$는 증가하였으며, 상대밀도가 점착력에 미치는 영향보다 ${p_i}'_{(BP)}$에 미치는 영향이 더 큰 것으로 나타났다. 또한 입자특성이 다른 세 종류의 모래시료에 대한 결과를 분석한 결과, 시료 입경이 작을수록 입자사이의 접촉점이 증가하여 점착력과 ${p_i}'_{(BP)}$가 크게 결정되었다.

Keywords

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