Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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An Experimental Study on the Strength of Deep Mixing Specimen According to the Stabilizer Content

안정재 혼합비에 따른 심층혼합 시료의 압축강도에 관한 실험적 연구

  • 박춘식 (창원대학교 공과대학 토목공학과) ;
  • 김종환 (창원대학교 공과대학 토목공학과) ;
  • 김정주 (대림토건) ;
  • 백진술 (경상남도 감사관실)
  • Received : 2013.10.04
  • Accepted : 2014.01.06
  • Published : 2014.01.31
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Abstract

In this study, laboratory test was carried out on uniaxial compressive strength by making 320 specimens in total, which were divided into two groups considering the curing time of 7 and 28 days for 80 cases mixed with stabilizers of 8%, 10%, 12%, 14% of 20 cases of clayey, sandy, and gravel mixed ground conditions to understand laboratory strength characteristics of deep mixing specimen for field application in various ground conditions. As a laboratory result, all specimen showed a clear tendency to have uniaxial compressive strength increase as the curing time and the stabilizer mixing ratio increased, and the strength increments depending on the age by ground types were, around 40.0% for clayey and gravel mixed grounds, 48.4% for sandy grounds which was the highest, and for the increment of stabilizers, around 37.0% for grounds with mixing ratio less then 14%, and 49.6% when the ratio was 14% which was the highest. Also, with sandy grounds, it showed a tendency to have a constant amount of strength increment as the stabilizer mixing ratio increased, for clayey mixed grounds, the strength increment tendency seemed to be similar to gravel mixed grounds. Due to these tendencies, it is concluded that we are able to propose a stabilizer mixing ratio for various ground conditions.

본 연구에서는 다양한 지반조건에서 현장적용을 위한 심층혼합시료의 실내강도특성 파악을 위하여 점토질, 모래질, 자갈질의 지반조건 20가지 경우에 8%, 10%, 12%, 14%로 안정재 혼합한 80가지 경우에 대하여 7일 및 28일 양생기간별로 두 개씩 총 320개의 공시체를 제작하여 일축압축강도에 대한 실내시험을 수행하였다. 실내시험 결과 모든 공시체는 양생기간과 안정재 혼합비가 증가함에 따라 일축압축강도가 증가하는 경향이 뚜렷하게 나타났으며, 재령에 따른 강도증가는 지반종류별로는 점토질과 자갈질 지반에서는 약 40.0%, 모래질 지반에서는 48.4%로 가장 크게 나타났고, 안정재 증가에 따라서는 혼합비가 14% 미만에서는 약 37.0%, 14%일 때 49.6%로 가장 크게 나타났다. 또한 모래질 지반은 혼합비 증가에 따라 강도증가가 점차적으로 커지는 경향을 보였으며, 점토질 지반과 자갈질 지반은 유사한 경향을 보였다. 이러한 경향에 의해 다양한 지반조건에 따른 심층혼합공법 강도 배합비를 제안할 수 있다.

Keywords

References

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