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2026 Vol.27, Issue 5
Development of Permeable Grout for Slope Reinforcement and Evaluation of Performances

사면 보강용 투수성 그라우트의 개발 및 성능 평가

Yunjin Kim1
,
Mugeon Kim2
,
Younguk Kim3*
김 윤진1
,
김 무건2
,
김 영욱3*
1M.S Student, Dept. of Civil and Environmental Engineering, Myongji University
2M.S Student, Dept. of Civil and Environmental Engineering, Myongji University
3Professor, Dept. of Civil and Environmental Engineering, Myongji University
*Corresponding Author
1 May 2026. pp. 5-14
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Abstract

The increasing frequency and intensity of extreme and localized rainfall events due to climate change have elevated the risk of slope failure caused by infiltration-induced pore water pressure buildup. Conventional cementitious grouts used for slope reinforcement are effective in enhancing mechanical strength; however, their low permeability can block subsurface drainage and reduce slope stability during rainfall. To address this limitation, this study developed a permeable grout with controlled internal pore structure to secure drainage capacity. Foam content was selected as the primary design variable, and stabilized foam and porous aggregates were incorporated to regulate pore formation within the grout matrix. The permeability, mechanical performance, and workability of the developed grout were systematically evaluated through laboratory experiments. The results showed that increasing the contents of foam and porous aggregates significantly improved porosity and permeability, achieving drainage performance comparable to natural slope soils. However, excessive pore formation decreased compressive strength, indicating a trade-off between permeability and structural stability. Considering the required compressive strength and flowability criteria, the optimal mixture range was identified as 3–5 % foam with no more than 10 % porous aggregate. The proposed permeable grout is expected to serve as an effective slope reinforcement material under rainfall conditions.

Keywords
Permeable grout
Slope reinforcement
Permeability
Compressive strength
Workability

최근 기후변화로 인해 극한 및 국지성 강우의 빈도와 강도가 증가하면서 침투수에 의한 간극수압 상승으로 사면 붕괴 위험이 증대되고 있다. 기존 사면 보강용 시멘트계 그라우트는 역학적 강도 증진에는 효과적이나, 낮은 투수성으로 인해 지중 배수 흐름을 차단하여 강우 시 사면 안정성을 저하시킬 수 있는 한계를 가진다. 이를 개선하기 위해 본 연구에서는 내부 공극 구조를 제어하여 배수 기능을 확보한 투수성 그라우트를 개발하였다. 기포 첨가량을 주요 설계 변수로 설정하고, 안정화된 기포와 다공질 골재를 활용하여 공극 구조를 조절하였다. 개발된 그라우트의 투수성, 역학적 성능 및 시공성을 실내 실험을 통해 체계적으로 평가하였다. 실험 결과, 기포와 다공질 골재 첨가량이 증가할수록 공극률과 투수계수가 유의하게 증가하여 자연사면 토층과 유사한 배수 성능을 확보할 수 있었다. 반면 과도한 공극 형성은 압축강도를 저하시켜 투수성과 구조적 안정성 간의 상충 관계가 나타났다. 요구 압축강도 기준과 유동성 조건을 종합적으로 고려한 결과, 기포 3–5 % 및 다공질 골재 10 % 이하 배합이 최적 범위로 도출되었다. 본 연구에서 제안한 투수성 그라우트는 강우 시 지중 배수를 촉진하면서도 초기 구조적 안정성을 유지할 수 있는 사면 보강 재료로 활용 가능할 것으로 기대된다.

키워드
투수성 그라우트
사면 보강
투수 성능
압축강도
시공성
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Information
  • Publisher :Korean Geo-Environmental Society
  • Publisher(Ko) :한국지반환경공학회
  • Journal Title :Journal of the Korean Geo-Environmental Society
  • Journal Title(Ko) :한국지반환경공학회 논문집
  • Volume : 27
  • No :5
  • Pages :5-14
  • Received Date : 2026-02-24
  • Revised Date : 2026-02-26
  • Accepted Date : 2026-03-12
  • DOI :https://doi.org/10.14481/jkges.2026.27.5.5
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