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2025 Vol.41, Issue 5 Preview Page
Evaluation of Hydrophobic and Mechanical Behavior of Hydrophobized Jumunjin Sand

소수화 처리된 주문진 표준사의 소수성 및 역학적 거동 특성 평가

Yeong-Ung Han1
,
Jin-Hyung Kim2
,
Jae-Hyun Kim3
,
Seong-Wan Park4
,
Byeong-Su Kim5*
한 영웅1
,
김 진형2
,
김 재현3
,
박 성완4
,
김 병수5*
1Member, Graduate Student, Dept. of Civil and Environmental Engineering, Dankook Univ.
2Member, Graduate Student, Dept. of Civil and Environmental Engineering, Dankook Univ.
3Member, Associate Prof., Dept. of Civil Engineering, Kangwon National Univ.
4Member, Prof., Dept. of Civil and Environmental Engineering, Dankook Univ.
5Member, Associate Prof., Dept. of Civil and Environmental Engineering, Dankook Univ.
1정회원, 단국대학교 토목환경공학과 석사과정
2정회원, 단국대학교 토목환경공학과 석사과정
3정회원, 강원대학교 건축토목환경공학부 부교수
4정회원, 단국대학교 토목환경공학과 교수
5정회원, 단국대학교 토목환경공학과 부교수
*Corresponding Author
31 October 2025. pp. 99-107
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Abstract

As a countermeasure for preventing slope collapse caused by the infiltration of rainfall into the ground, hydrophobic ground materials can be applied as a water-proofing layer inside slopes. In this study, to obtain basic research data, Jumunjin standard sand was first hydrophobized and its hydrophobicity was evaluated. In the evaluation of the water infiltration head (WIH) for determining the hydrophobicity, the water-proofing performance of the sand was indicated by WIH = 10.24 cm H2O, the water drop penetration time was more than 3,600 s, and the contact angle was 134.6°, indicating that the material exhibits high hydrophobicity and water-proofing capability. A direct shear test was also performed to determine the mechanical characteristics of the hydrophobic Jumunjin sand, where the internal friction angles of the hydrophilic and hydrophobic materials were 40.3° and 32.3°, respectively (approximately 20% reduction). Therefore, for future application of hydrophobic barriers, the slope stability should be evaluated comprehensively, considering local strength reductions and the effect of blocking rainwater infiltration across the entire slope.

Keywords
Hydrophobicity
Impervious layer
Shear strength
Slope stability
Water-repellent soil

국내의 사면 붕괴는 대부분 집중호우 시기에 발생한다. 본 연구는 강우 침투로 인한 사면 안정성 문제에 대응하기 위한 공법으로, 소수성 지반재료를 차수층으로 적용할 때의 공학적 특성을 평가했다. 소수성 주문진사는 소수성 평가를 위한 Water infiltration head(WIH) 시험에서 WIH = 10.24 cmH2O, Water drop penetration time(WDPT) 시험에서 3,600초 이상의 침투 저항, 그리고 접촉각 측정 시험에서 134.6°를 나타냈다. 또한 소수성 주문진사의 역학적 특성 파악을 위해 직접전단시험을 실시하여 친수성과 소수성 재료의 내부마찰각이 각각 40.3°과 32.3°가 얻어졌고 약 20% 감소한다는 것을 확인했다. 이러한 소수성 재료의 차수 성능 증가와 전단강도 저하 특성은 향후 소수성 차수층의 공학적 적용 시, 국부적인 강도 감소와 사면 전체의 강우 침투 차단 효과를 종합적으로 고려한 안정성 평가가 필요함을 시사한다.

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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 : 41
  • No :5
  • Pages :99-107
  • Received Date : 2025-08-11
  • Revised Date : 2025-09-11
  • Accepted Date : 2025-09-12
  • DOI :https://doi.org/10.7843/kgs.2025.41.5.99
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