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2024 Vol.40, Issue 1 Preview Page
Soil-Water Characteristic Curves for Drying and Wetting Processes in Granite-Weathered Soil Based on Variations in Fine Contents

세립분 함량을 고려한 국내 화강풍화토의 건조 및 습윤 함수특성곡선 분석

Sangbeen Lee1
,
Jae-Eun Ryou2
,
Jinuk Seo3
,
Jongwon Jung4*
이 상빈1
,
유 재은2
,
서 진욱3
,
정 종원4*
1Member, Combined MS-Ph.D Student, Dept of Civil Engrg, Chungbuk National Univ.
2Member, Ph.D Candidate, Dept of Civil Engrg, Chungbuk National Univ.
3President, Korea Construction Institute
4Member, Prof., Dept. of Civil Engrg., Chungbuk National Univ.
1정회원, 충북대학교 토목공학과 석박사통합과정
2정회원, 충북대학교 토목공학과 박사과정
3비회원, 한국건설연구소(주) 대표이사
4정회원, 충북대학교 토목공학부 교수
*Corresponding Author
29 February 2024. pp. 47-54
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Abstract

In current slope stability analysis techniques, slope stability is evaluated based on the saturated-soil theory. However, soil-water characteristics change frequently depending on the climate. Therefore, because the saturated soil theory has limitations, the application of the unsaturated soil theory is necessary for slope stability. It is also important to evaluate the engineering properties of unsaturated soil because the capillary absorption capacity is reduced due to heavy rain, thereby causing a reduction in slope stability. In this study, soil-water characteristic tests were performed using four samples with different fine contents (0%, 10%, 20%, and 30%) using granite-weathered soil in domestic production areas. In particular, to consider the previously conducted drying process as well as the evaluation of stability due to heavy rain on the actual slope, a wetting process was conducted, in which the water content was increased. In addition, the van Genuchten (1980) model, which is the most consistent theoretical equation for the experiment, was used with various theoretical equations, and the parameters were analyzed according to the fine content of the granite-weathered soil for the drying and wetting processes.

Keywords
Fine contents
Granite-weathered soil
Soil-water characteristic curve
Unsaturated soil
van Geunchten model

기존의 사면안정해석은 포화토 이론에 기반하여 비탈면 안정성에 대한 평가가 진행되었다. 그러나 자연 지반은 기후에 따라 함수 특성이 변화하기 때문에 포화토 이론은 한계가 있어 불포화토의 특성을 고려한 안정해석 연구가 필요하다. 또한, 실제 불포화토 지반은 호우로 인해 모관흡수력이 감소하여 사면 안정성의 저감을 유발하기 때문에 이에 대한 공학적 특성을 평가하는 것이 중요한 실정이다. 본 연구에서는 국내 산지에 내포된 화강풍화토를 활용하여 세립분 함량을 0%, 10%, 20%, 30%로 구분한 4가지 시료를 통해 흙-함수 특성 시험을 수행하였으며, 특히 건조과정 뿐만 아니라 실제 사면에서 호우로 인한 안정성 평가를 고려하기 위해 함수비를 증가시키는 습윤과정을 진행하였다. 또한, 다양한 이론식을 적용하여 실험에 가장 일치하는 이론식인 van Genuchten(1980) 모델을 활용하였으며, 건조과정과 습윤과정에 대한 화강풍화토의 세립분에 따른 파라미터를 분석하였다.

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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 : 40
  • No :1
  • Pages :47-54
  • Received Date : 2024-01-17
  • Revised Date : 2024-02-04
  • Accepted Date : 2024-02-04
  • DOI :https://doi.org/10.7843/kgs.2024.40.1.47
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