Journal of the Korean Geotechnical Society (한국지반공학회논문집)

Korean Geotechnical Society (한국지반공학회)
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Correlation between Casagrande Test and Fall Cone Test Methods and their Applicability in Ground Improvement

카사그란데방법과 원추관입시험방법의 상관관계와 지반개량제의 적용성에 대한 연구

  • Received : 2022.11.22
  • Accepted : 2023.02.19
  • Published : 2023.02.28
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Abstract

In this study, a classification and uniaxial compression test of soil was conducted on 15 collapsed sites to use ground improvement with excellent protection effect owing to the increase of localized heavy rain in Korea. The Casagrande method and fall cone test were performed on the field soil to derive an expression for comparing liquid limit and plastic limit values, soil classification, and correlation between each other. By deriving the optimal mixing ratio of the ground improvement agent using uniaxial compressive strength for each soil classification, the classification of the fine-grained soil was not clear owing to the proficiency difference and test error. However, after classifying using the fall cone test, it was possible to suggest a clear optimal mixing ratio.

본 연구에서는 국내 국지성 호우의 증가로 인한 피해의 보호효과가 탁월한 지반개량제를 표층개량공법에 활용하기 위해 붕괴된 15개소의 현장토를 대상으로 흙의 분류 및 일축압축시험을 진행하여 토질별 최적배합비를 제안하는 연구를 진행하였다. 현장토에 대해 Casagrande법과 원추관입시험법을 실시하여 액·소성한계값의 비교, 흙의 분류 및 서로의 상관관계에 대한 관계식을 유도하였다. 각각의 흙의 분류에 대해 일축압축강도를 이용하여 지반개량제의 최적 배합비를 도출한 결과, Casagrande법으로 분류한 경우 실험자의 숙련도 차이와 시험의 오차에 의해 세립토의 분류가 명확하지 않았지만, 원추관입시험법으로 분류하였을 때 명확한 최적 배합비를 제안할 수 있었다.

Keywords

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