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Impacts of Rainfall Events and Distribution on Unsaturated Soil Slope Analysis

불포화 토사사면 해석에 대한 강우사상과 분포의 영향

Jae-Hong Kim1
,
Ho-Kyum Kim2
,
Byeongsu Kim3
,
Seong-Wan Park4*
김 재홍1
,
김 호겸2
,
김 병수3
,
박 성완4*
1Member, Assistant Prof., Dept. of Civil Engrg., Dongshin Univ.
2Member, Prof., Dept. of Civil & Environment Engrg., Dankook Univ.
3Member, Master of Eng., Dept. of Civil & Environment Engrg., Dankook Univ.
4Member, Assistant Professor, Dept. of Environmental & Civil Engrg., Okayama Univ., Japan
1동신대학교 토목공학과 조교수
2단국대학교 토목환경공학과 교수
3단국대학교 토목환경공학과, 공학석사
4일본 오카야마대학교 환경이공학부 조교수
*교신저자. *Corresponding Author. 
31 January 2016. pp. 35-43
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Abstract

The time distribution of rainfall is one of the most important considerations for evaluating soil slope stability. In order to study the rainfall-induced slope failure, the rainfall pattern has generally been assumed as uniform rainfall intensity for rainfall duration. However, it should be noted that the time distribution of the design rainfall method has a significant effect on the soil slope instability. The study implemented Mononobe, Huff, and uniform method as three types of time distribution method of the design rainfall to estimate the factor of safety of soil slopes by rainfall duration. As a result, the difference of soil suction and unsaturated hydraulic properties in a soil by rainfall pattern was found through the application of an appropriate time distribution method to numerical simulation for rainfall-induced slope stability.

Keywords
Unsaturated soil slope
Soil-water characteristic curve
Huff method
Mononobe method
Rainfall distribution

사면 안정성을 평가하기 위해서는 강우의 시간적 분포가 매우 중요한 영향을 끼친다. 강우로 발생하는 사면붕괴를 해석하기 위해서는 강우패턴을 일반적으로 일정한 형태로 가정하고 해석을 수행한다. 그러나 강우의 시간적분포를 적용하는 설계방법은 사면의 불안정성을 평가하기에 중요한 요소이다. 본 연구에서는 강우에 의한 사면파괴를 계산하기 위해 강우의 시간적 분포는 Mononobe 방법과 Huff 4분위 방법을 적용하였다. 그 결과, 표층으로부터의 습윤대 깊이의 차이를 보였으며, 사면의 안전율 계산에서도 강우의 시간적분포가 영향을 끼치고 있음을 확인하였다.

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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 : 32
  • No :1
  • Pages :35-43
  • Received Date : 2015-11-23
  • Accepted Date : 2015-12-30
  • DOI :https://doi.org/10.7843/kgs.2016.32.1.35
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