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Research Article

Infinite Slope Stability Analysis based on Rainfall Pattern in Ulleung-do

울릉도지역 강우패턴을 고려한 무한사면 안정성 해석

Chung-Ki Lee1
,
Seong-Woo Moon1
,
Hyun-Seok Yun1
,
Yong-Seok Seo1*
이 충기1
,
문 성우1
,
윤 현석1
,
서 용석1*
1Department of Earth and Environmental Sciences, Chungbuk National University
1충북대학교 지구환경과학과
* 교신저자* Corresponding Author
March 2018. pp. 11-24
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Abstract

The purpose of slope stability analysis is to predict the location and occurrence time considering the rainfall, topographic and soil characteristics, etc. In this study, infinite slope stability analysis considering the time distribution characteristics of the daily maximum rainfall was conducted using a model that combines a digital terrain model and a groundwater flow model. As the results of slope stability analysis, 69.1~70.0% of Fs < 1 cells are in the range of slope angle 20~50° and Fs < 1 starts to appear in 2 hours for Q1 model, 5 hours for Q2, 7 hours for Q3 and 6 hours for Q4. Furthermore, the maximum number of Fs < 1 cells appear in 6 hours for Q1 model, 12 hours for Q2, 16 hours for Q3 and 20 hours for Q4, and the area of Fs < 1 is 14.3% for Q1 model, 15.0% for Q2, 15.6% for Q3, and 16.3% for Q4.

Keywords
landslide
Huff’s method
rainfall pattern
temporal groundwater change model
infinite slope stability analysis

사면 안정해석의 목적은 강우, 지형 및 토질 특성 등을 고려하여 발생 위치와 발생 시간을 예측하는 것이다. 본 연구에서는 수치지형 모델, 지하수위 변화를 반영하는 집수모델, 무한사면 안정해석 모델을 결합한 모델을 이용하여 울릉도 산지를 대상으로 Huff 4분위법의 강우패턴에 따라 시간대별로 변화하는 지하수위를 고려한 사면 안정해석을 실시하고, 그 결과를 정량적으로 분석하였다. 해석 결과 사면의 경사가 20~50° 범위일 때 안전율 1.0 이하의 셀이 전체의 69.1~70.0로 가장 넓게 분포하였으며, 강우 지속시간이 1분위(Q1)의 경우 2시간, 2분위(Q,2) 5시간, 3분위(Q3) 7시간, 4분위(Q4) 6시간부터 안전율 1.0 이하의 셀이 나타나기 시작한다. 또한, 안전율 1.0 이하의 셀이 최대로 나타나는 강우 지속시간은 1분위의 경우 6시간, 2분위 12시간, 3분위 16시간, 4분위 20시간으로 나타났으며, 분위별 안전율 1.0 이하 면적은 각각 14.3%, 15.0%, 15.6%, 16.3%로 나타났다.

키워드
산사태
허프(Huff)의 4분위법
강우패턴
집수모델
무한사면 안정성 해석
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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 : 28
  • No :1
  • Pages :11-24
  • Received Date : 2018-01-08
  • Revised Date : 2018-02-23
  • DOI :https://doi.org/10.9720/kseg.2018.1.011
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