Study on the Measurement of Liquid Limit Using a Penetration Resistance of Small Cone in Clay Soil

소형콘의 관입저항력을 이용한 점토의 액성한계측정에 관한 연구

  • Son, Moorak (Dept. of Geotechnical Engrg., Daegu Univ.) ;
  • Lee, Jaeyong (Dept. of Geotechnical Engrg., Daegu Univ.)
  • 손무락 (대구대학교 토목공학과) ;
  • 이재용 (대구대학교 토목공학과)
  • Received : 2016.03.15
  • Accepted : 2016.09.19
  • Published : 2016.10.31


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.


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