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2025 Vol.41, Issue 1 Preview Page
Estimation of Debris Flow Impact Pressure Using Numerical Analysis

수치해석을 활용한 토석류 충격압 산정

Hosung Shin1*
,
Gyu-Hwan Choi2
신 호성1*
,
최 규환2
1Member, Prof., Dept. of Civil & Environmental Engrg., Univ. of Ulsan
2Member, Korea Rural Community Corporation
1정회원, 울산대학교 건설환경공학부 교수
2정회원, 한국농어촌공사 차장
*Corresponding Author
28 February 2025. pp. 23-32
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Abstract

This study employs numerical simulations to develop a reliable formula for predicting the impact pressure exerted by debris flows on buildings. The simulations account for variations in terrain attributes and debris properties. The results indicate that an increased liquidity index reduces debris flow viscosity and friction angle, leading to higher approach velocity and impact pressure. Based on the numerical findings, multiple regression analyses are conducted to examine the relationship between approach velocity and impact pressure. The slope angle, slope height, volume, and liquidity index of the debris flow serve as independent variables. After applying logarithmic transformations, the goodness-of-fit and statistical significance of the model and regression coefficients are evaluated using F-tests and t-tests. The analyses reveal that the liquidity index and slope height are the most influential factors affecting approach velocity, while debris flow volume and the liquidity index primarily determine impact pressure. Estimation formulas for approach velocity and impact pressure, derived from the numerical results, demonstrate high goodness-of-fit and reliability. However, the model’s predictive stability decreases when analyzing debris flows with a low liquidity index. The findings of this study provide a crucial foundation for debris flow mitigation design and the development of strategies to minimize structural damage.

Keywords
Debris flow
Impact pressure
Numerical analysis
Multiple regression analyses

본 연구는 수치해석 결과를 이용하여 토석류가 건물에 작용하는 충격압을 신뢰성 있게 예측할 수 있는 추정식을 개발하는 것이다. 이를 위해, 지형조건과 토석류 특성의 변화를 반영한 수치해석을 수행하였다. 액성지수 증가로 인한 토석류의 점성과 마찰각 감소는 접근 속도와 충격압의 증가시키는 것으로 나타났다. 수치해석 결과로 산정된 토석류의 접근 속도와 충격압에 대한 다중회귀분석을 수행하였다. 사면 경사각, 사면 높이, 토석류 유발량, 그리고 액성지수를 독립변수로 사용하였다. 변수들에 로그 변환을 적용한 후, F-검정과 t-검정을 통해 모델과 회귀계수의 적합도 및 통계적 유의성을 검증하였다. 다중회귀분석 결과, 액성지수와 사면 높이가 접근 속도에 가장 큰 영향을 미치는 주요 변수로 확인되었으며, 토석류 유발량과 액성지수는 충격압에 가장 큰 영향을 미치는 요인으로 분석되었다. 수치해석 결과를 바탕으로 도출된 충격압 및 접근 속도 추정식은 높은 적합도와 신뢰성을 보였다. 다만, 액성지수가 낮은 토석류(LI=1.3)의 경우, 모델의 예측 안정성이 저하되는 것으로 나타났다. 본 연구 결과는 토석류 방재 설계와 구조물 피해 저감 대책 수립을 위한 기초 자료로 활용될 수 있다.

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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 :1
  • Pages :23-32
  • Received Date : 2025-01-22
  • Revised Date : 2025-02-01
  • Accepted Date : 2025-02-01
  • DOI :https://doi.org/10.7843/kgs.2025.41.1.23
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