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Research Article

Analysis of Undrained Shear Strength Characteristics According to Fine Content of Mixed Soil

혼합토의 세립분 함유율에 따른 비배수전단강도 특성 분석

Jae-Hwi Kim1
,
Chan-Young Park2
,
Seung-Joo Lee3
,
YoungSeok Kim4
,
Da-Bin Kwon5
,
Ja-Yong Choi5
,
Soon-Joo Choi6
,
Yong-Seong Kim7*
김 재휘1
,
박 찬영2
,
이 승주3
,
김 영석4
,
권 다빈5
,
최 자용5
,
최 순주6
,
김 용성7*
1Member, Researcher, Korea National Park Service, 22 Hyeoksin-ro, Wonju-si, Gangwon-do 26466, Republic of Korea
2Member, Ph.D Candidate, Department of Regional Infrastructure Engineering, Kangwon National Univ., 1 Kangwondaehak-gil, Chuncheon, Gangwon-do 24341, Republic of Korea
3Member, Researcher, Korean Peninsula Infrastructure Research Center, Department of Construction Policy Research, Korea Institute of Civil Engineering and Building Technology, 283 Goyang-Daero, Ilsanseo-Gu, Goyang-Si, Gyeonggi-Do 10223, Republic of Korea
4Member, Senior Research Fellow, Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology, 283 Goyang-Daero, Ilsanseo-Gu, Goyang-Si, Gyeonggi-Do 10223, Republic of Korea
5Member, Master Student, Department of Regional Infrastructure Engineering, Kangwon National Univ., 1 Kangwondaehak-gil, Chuncheon, Gangwon-do 24341, Republic of Korea
6Member, Ph.D Candidate, Department of Regional Infrastructure Engineering, Kangwon National Univ., 1 Kangwondaehak-gil, Chuncheon, Gangwon-do 24341, Republic of Korea
7Member, Professor, Department of Regional Infrastructure Engineering, Kangwon National Univ., 1 Kangwondaehak-gil, Chuncheon, Gangwon-do 24341, Republic of Korea
*Corresponding Author
30 March 2025. pp. 101-111
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Abstract

In this study, in order to present the content of the converted fine particles of the sand-clay mixed soil, indoor and non-drain triaxial compression tests were conducted by adjusting the content and relative density of various fine particles. Relative density was adjusted by using the dry deposition method, and the specimen was prepared at various mixing ratios by adjusting the ratio of sand and clay to 0-100%, and the test results compared and analyzed the void ratio, the skeletal void ratio, shear strength, and maximum axis stress. As a result of the study, it was confirmed that the shear strength decreased as the fine particle content increased, and it was confirmed that the void ratio, the skeletal void ratio, and the shear strength all showed similar behavior to clay in the fine particle content of 20% or more. Therefore, it is not considered appropriate to uniformly apply the soil classification criteria of sandy soil and viscous soil, and it is judged that it is necessary to prepare a reasonable soil classification standard including the content of the converted fine particles as various studies on the mixed soil continue in the future.

Keywords
Sandy soil
Clay
Triaxial compression test
CIU
Shear strength

본 연구에서는 모래-점토 혼합토의 전환 세립분 함유율을 제시하기 위해 다양한 세립분 함유율과 상대밀도를 조정하여 실내 시험 및 비배수 삼축압축시험을 수행하였다. 건조퇴적법을 활용하여 상대밀도를 조정하였으며, 모래와 점토의 비율을 0~100%로 조정하며 다양한 혼합비율로 공시체를 제조하였고, 시험 결과를 통해 간극비 및 골격 간극비와 전단강도 및 최대 축차응력을 비교·분석하였다. 연구 결과 세립분 함유율이 증가할수록 전단강도가 감소하는 것을 확인하였으며, 세립분 함유율 20% 이상에서 간극비와 골격 간극비, 전단강도 모두 점토와 유사한 거동을 나타내는 것을 확인하였다. 따라서 현재 사질토와 점성토의 토질분류 기준을 획일적으로 적용하는 것은 적절하지 않은 것으로 판단되며, 향후 혼합토에 대한 다양한 연구가 지속되어 전환 세립분 함유율을 포함한 합리적인 흙 분류 기준 마련이 필요할 것으로 판단된다.

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Information
  • Publisher :Korean Geosythetics Society
  • Publisher(Ko) :한국지반신소재학회
  • Journal Title :Journal of the Korean Geosynthetics Society
  • Journal Title(Ko) :한국지반신소재학회 논문집
  • Volume : 24
  • No :1
  • Pages :101-111
  • Received Date : 2025-02-10
  • Revised Date : 2025-03-11
  • Accepted Date : 2025-03-17
  • DOI :https://doi.org/10.12814/jkgss.2025.24.1.101
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