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2023 Vol.22, Issue 3 Preview Page

Research Article

Evaluation of Mechanical Characteristics and Concentration Target Layer Applicability of Silty Sand by Fines Content

실트질 모래의 세립분 함유율에 따른 역학적 특성 및 압밀 대상층 적용성 평가

Jung-Meyon Kim1
,
Min-Seo Kang2
,
Jong-Joo Kim2
,
Seung-Joo Lee3
,
Young-Seok Kim4
,
Chan-Young Park5
,
Yong-Seong Kim6*
김 정면1
,
강 민서2
,
김 종주2
,
이 승주3
,
김 영석4
,
박 찬영5
,
김 용성6*
1Member, Ph.D., Department of Regional Infrastructure Engineering, Kangwon National Univ., 1 Kangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, Republic of Korea
2Member, Ph.D. Candidate, Department of Regional Infrastructure Engineering, Kangwon National Univ., 1 Kangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, Republic of Korea
3Member, Research, Korean Peninsula Infrastructure Special Committee, Korea Institute of Civil Engineering and Building Technology, 283 Goyangdae-Ro, Ilsanseo-Gu, Gyeonggi-Do 10223, Republic of Korea
4Member, Senior Research Fellow, Northern Infrastructure Specialized Team, Korea Institute of Civil Engineering and Building Technology, 283 Goyangdae-Ro, Ilsanseo-Gu, Gyeonggi-Do 10223, Republic of Korea
5Member, Ph.D. Student, Department of Regional Infrastructure Engineering, Kangwon National Univ., 1 Kangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, Republic of Korea
6Member, Professor, Department of Regional Infrastructure Engineering, Kangwon National Univ., 1 Kangwondaehak-gil, Chuncheon-si, Gangwon-do 24341, Republic of Korea
*Corresponding Author
30 September 2023. pp. 37-46
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Abstract

In this paper, the physical properties, stress deformation and strength characteristics, density and permeability characteristics of silty sand (SM) by fines content were analyzed through indoor tests. also based on the results of the indoor tests, a compact analysis was performed according to the content of SM, and the applicability of SM ground to the compacted target layer was evaluated by comparing it with the measurement data of the actual problem site. As a result of indoor tests and compression analysis, SM changed its mechanical properties from sandy soil to viscous soil when the fine particle content was 35% or higher, and using field measurement data, SM was found to have a higher compression tendency than direct subsidence. Therefore, the mechanical characteristics of SM above Fc 35% are considered to be similar to that of viscous soil, which is different from the compression characteristics of the tendency of immediate subsidence to conventional sandy soil, so it is necessary to present the mechanical characteristics of SM through further research. The research findings highlight the importance of considering consolidation settlement in silty sand (SM) when evaluating soft soil conditions. These findings can aid in revising criteria for assessing weak ground conditions by providing essential engineering property data based on varying fines content in silty sand.

Keywords
Silty sand(SM)
Fines content rate
Mechanical characteristics
Soft ground
Concentration

본 연구에서는 실내시험을 통하여 통일분류법(USCS)상 세립질 모래인 실트질 모래(SM)의 세립분 함유율(Fc)에 따른 물리적 특성, 응력 변형 및 강도 특성, 압밀 및 투수 특성을 분석하였다. 또한 실내시험 결과를 바탕으로 세립분 함유율별 SM으로 이루어진 지반에 대한 압밀해석을 실행하고 실제 문제가 발생한 연약지반 개량 현장의 계측자료와 비교 분석하여 연약지반 설계 시 압밀대상층에 대한 SM지반의 적용성 평가를 수행하였다. 실내시험 및 압밀해석 결과 SM은 사질토에서 점성토로의 역학적 특성 변환이 세립분 함유율이 35%이상일 때 이루어졌으며, 현장 계측자료를 이용하여 고찰한 결과 Fc 35% 이상일 경우 SM은 즉시침하보다 압밀침하 경향이 높았으며, 이는 기존의 연약지반 설계기준에서 제시한 SM의 특성과 상이한 결과로 판단된다. 따라서 Fc 35% 이상의 SM에서의 역학적 특성은 점성토와 유사한 것으로 사료되며 이는 기존의 사질토에 대한 즉시침하 경향의 압축특성과는 상이하므로 추후 지속적인 연구를 통한 SM의 역학적 특성 제시가 필요하다. 본 연구 결과 연약지반 판정 시 SM의 압밀침하 발생을 고려해야 할 필요가 있는 것으로 판단되며 추후 연약지반 판정 기준 개정에 도움이 될 수 있도록 실트질 모래의 세립분 함유율에 따른 공학적 특성에 대한 기초자료를 제공하였다.

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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 : 22
  • No :3
  • Pages :37-46
  • Received Date : 2023-05-30
  • Revised Date : 2023-07-18
  • Accepted Date : 2023-07-26
  • DOI :https://doi.org/10.12814/jkgss.2023.22.3.037
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