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2025 Vol.35, Issue 4 Preview Page

Research Article

Evaluation of Three-Dimensional Slope Stability Under Varying Pore Pressure Ratios Using Scoops3D

Scoops3D를 활용한 간극수압비 변화에 따른 3차원 사면 안정성 평가

Kounghoon Nam1
,
Youngkyu Lee2
,
Sungsu Lee3
,
Gyo-Cheol Jeong4
,
Jongtae Kim5*
남 경훈1
,
이 영규2
,
이 승수3
,
정 교철4
,
김 종태5*
1Researcher, Fire Insurers Laboratories of Korea
2Principal Researcher, Fire Insurers Laboratories of Korea
3Professor, Department of Civil Engineering, Chungbuk National University
4Emeritus Professor, Department of Earth and Environmental Sciences, Gyeongkuk National University
5CEO, Nature and Tech Inc.
1방재시험연구원 전문위원
2방재시험연구원 책임연구원
3충북대학교 토목공학부 교수
4국립경국대학교 지구환경과학과 명예교수
5㈜자연과기술 대표이사
*Corresponding Author
31 December 2025. pp. 731-744
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Abstract

We evaluated three-dimensional slope stability quantitatively under varying pore-water pressure ratios using Scoops3D. The analysis revealed that the global minimum factor of safety (FOS) was 1.325 under dry conditions (ru = 0), indicating a relatively stable state, but decreased nonlinearly with increasing pore-water pressure to 0.536 at ru = 0.6. At the same time, the volume of the potential sliding mass increased from 501 to 1,305 m3, approximately 2.6 times larger, implying a reduction in effective stress and a deepening of the failure surface caused by elevated pore-water pressure. Our results demonstrate that even in areas where borehole investigation is difficult, a combination of seismic refraction surveys and Scoops3D analysis can effectively identify slope instability zones in a rational manner. Furthermore, the proposed approach can serve as a fundamental framework for predicting the potential occurrence of debris flows in channels prior to rainfall events and for reasonably estimating pre-failure debris-flow volumes.

Keywords
Scoops3D
three-dimensional slope stability
pore pressure ratio
seismic refraction survey

본 연구는 Scoops3D를 활용하여 간극수압비 변화에 따른 사면의 3차원 안정성을 정량적으로 평가하였다. 분석 결과, 전역 최소 안전율(global minimum safety factor, FOS)은 건조 상태(ru = 0)에서 1.325로 비교적 안정한 상태를 유지하였으나, 간극수압이 증가함에 따라 비선형적으로 감소하여 ru = 0.6에서 0.536으로 나타났다. 이와 동시에 잠재 미끄럼체의 체적은 501 m3에서 1,305 m3로 약 2.6배 증가하였으며, 이는 간극수압 상승으로 인한 유효응력 감소와 사면 내부 파괴면의 심부 확장을 의미한다. 분석 결과는 시추조사가 어려운 지역에서 탄성파 탐사 및 Scoops3D를 활용하여 사면 취약 구간을 합리적으로 도출할 수 있음을 보여주었다. 또한, 제시된 접근법은 강우 전 단계 계류부 지역에서 토석류 발생 가능성을 예측하고, 사면 붕괴 전 토석류 체적을 합리적으로 산정하기 위한 기초자료로 활용될 수 있다.

키워드
Scoops3D
3차원 사면 안정성
간극수압비
굴절법 탄성파 탐사
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Information
  • Publisher :Korean Society of Engineering Geology
  • Publisher(Ko) :대한지질공학회
  • Journal Title :The Journal of Engineering Geology
  • Journal Title(Ko) :지질공학
  • Volume : 35
  • No :4
  • Pages :731-744
  • Received Date : 2025-10-30
  • Revised Date : 2025-12-03
  • Accepted Date : 2025-12-22
  • DOI :https://doi.org/10.9720/kseg.2025.4.731
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