한국지반공학회논문집 (Journal of the Korean Geotechnical Society)

  • 제32권6호
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  • Pages.27-40
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  • 2016
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  • 1229-2427(pISSN)
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  • 2288-646X(eISSN)
한국지반공학회 (Korean Geotechnical Society)
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울산 산사태 위험지역의 강우 침투 안정성 평가

Slope Stability Assessment on a Landslide Risk Area in Ulsan During Rainfall

  • 김진욱 (울산대학교 건설환경공학부) ;
  • 신호성 (울산대학교 건설환경공학부)
  • Kim, Jinwook (Dept. of Civil & Environmental Engrg., Univ. of Ulsan) ;
  • Shin, Hosung (Dept. of Civil & Environmental Engrg., Univ. of Ulsan)
  • 투고 : 2016.04.12
  • 심사 : 2016.06.03
  • 발행 : 2016.06.30
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초록

기존의 강우에 의한 사면붕괴 기준들은 지형학적 특성, 임상특성, 불포화 지반 조건 등을 반영하지 않아 사면 파괴 예측 지표로 활용하기에는 많은 문제점을 가지고 있다. 본 연구에서는 강우패턴, 지형학적 특성(경사, 토심), 공학적 특성(불포화 지반 특성), 임상특성(식생 뿌리에 의한 영향, 수목하중) 등을 반영할 수 있는 불포화 사면 안정성 해석 방법을 제안하였다. 뿌리보강과 수목하중을 고려하지 않는 사면의 안전율 평가는 안전율을 과다 평가하는 것으로 나타났다. 제안된 안정성 해석 방법에 의하여 강우에 의한 불포화사면의 안전율에 대한 데이터베이스를 구축하고, 이를 GIS와 연계하여 울주군 산사태위험 지정지역에 적용하여 강우에 대한 사면 위험성을 정량적으로 분석하였다. 산사태위험지역은 강우에 의한 사면의 안전율이 낮거나, 대부분 안전율 감소가 급격하게 발생한 지점의 하류에 위치하고 있음을 알 수 있다.

Conventional warning criteria for landslides due to rainfall in broad regions have limitations, because they did not have proper reflection of topography, forest physiognomy, and unsaturated soil properties, et al. This study suggested a new stability model for unsaturated slope analyses during rainfall, considering rainfall pattern, geomorphological characteristics (slope angle, soil depth), engineering properties of unsaturated soils, and tree surcharge and root reinforcement. Stability analysis not considering root reinforcement and tree surcharge tends to over-predict a factor of safety in unsaturated slopes. Developed slope stability model was used to build database on the factor of safety in unsaturated slopes during rainfall, and it was integrated with GIS to do quantitative risk analysis in landslide risk areas specified in Ulju. Landslide risk areas were located at downstream of the point with sudden drop in safety factor, as well as at regions with low safety factor during rainfall.

키워드

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피인용 문헌

  1. Regression Equations for Estimating Landslide-Triggering Factors Using Soil Characteristics vol.10, pp.10, 2016, https://doi.org/10.3390/app10103560