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2016 Vol.32, Issue 10
Study on the Measurement of Liquid Limit Using a Penetration Resistance of Small Cone in Clay Soil

소형콘의 관입저항력을 이용한 점토의 액성한계측정에 관한 연구

Moorak Son1*
,
Jaeyong Lee2
손 무락1*
,
이 재용2
1Member, Prof., Dept. of Geotechnical Engrg., Daegu Univ.
2Graduate Student, Dept. of Geotechnical Engrg., Daegu Univ.
1정회원,대구대학교 토목공학과 교수
2비회원, 대구대학교 토목공학과 석사과정
*교신저자. *Corresponding Author. 
31 October 2016. pp. 5-15
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Abstract

This study investigated both water content and penetration resistance of small cone of various clay soils that were made of Kaolinite and Bentonite with different mixing ratios and compared the results with those of the existing dynamic (Casagrande test) and static (fall cone test) tests directly. The comparison showed that the water content at the inflection point on a curve of water content and penetration resistance was very similar to the liquid limit from a fall cone test. The penetration resistance of small cone at the inflection point was 0.2 kPa, and it was ascertained that the water content at the inflection point represents a liquid limit of clay soils. From the study results, it was found that the penetration resistance of 0.2 kPa with the small cone can be an indicator of the liquid limit of clay soils in practice. Finally a test procedure to measure the liquid limit of clay soil based on a penetration resistance of small cone was proposed

Keywords
Clay soil
Liquid Limit
Penetration resistance
Small cone
Casagrande test
Fall cone test

본 연구에서는 소형콘의 관입저항력을 이용한 점토의 액성한계를 측정하기 위하여 카올리나이트 점토와 벤토나이트 점토의 비율을 다양하게 혼합한 점토흙에 대하여 함수비와 소형콘의 관입저항력을 조사하고 기존의 동적(Casagrande 시험법) 및 정적(Fall cone 시험법) 액성한계 시험결과와 직접 비교하였다. 비교결과 다양한 점토흙의 함수비에 따른 관입저항력 관계곡선에서 변곡점이 형성된다는 것을 파악하였으며 이 때의 함수비가 정적액성한계(Fall cone)시험법에 의한 액성한계 값과 매우 유사함을 파악하였다. 변곡점이 형성된 점에서의 소형콘의 관입저항력은 약 0.2kPa로 나타났으며 이 때 의 함수비가 점토흙의 액성한계를 나타낸다는 것을 확인하였다. 이와 같은 연구결과를 토대로 향후 점토의 액성한계를 파악하는데 본 연구에서 조사된 0.2kPa의 소형콘의 관입저항력이 유용한 지표가 될 수 있다는 사실을 파악하였다. 또한 소형콘의 관입저항력을 이용한 액성한계 시험법을 제시하였다.

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Information
  • Publisher :The Korean Geotechnical Society
  • Publisher(Ko) :한국지반공학회
  • Journal Title :Journal of the Korean Geotechnical Society
  • Journal Title(Ko) :한국지반공학회 논문집
  • Volume : 32
  • No :10
  • Pages :5-15
  • Received Date : 2016-03-15
  • Revised Date : 2016-08-25
  • Accepted Date : 2016-09-19
  • DOI :https://doi.org/10.7843/kgs.2016.32.10.5
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