• Title/Summary/Keyword: Pradel & Raad model

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A Study of Stability Analysis on Unsaturated Soil Slopes Considering Rainfall (강우를 고려한 불포화 토사사면의 안정해석 연구)

  • Kim, Khi-Woong;Kim, Bum-Joo;Park, Jeong-Jun
    • Journal of the Korean Geosynthetics Society
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    • v.7 no.4
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    • pp.9-18
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    • 2008
  • Shallow slope failures in residual soil during periods of prolonged infiltration are common in Korea. This study examines an infinite slope analysis to estimate the influence of infiltration on surficial stability of slopes by the limit equilibrium method. Approximate method which is based on the Green-Ampt model have been considered to evaluate the likelihood of shallow slope failure which is induced by a particular rainfall event that accounts for the rainfall intensity and duration for various return periods. Pradel & Raad method which is devised to predict the depth of wetting front to decomposed granite soil slopes having measured soil-water characteristic curves. To compare the results with those obtained from the Pradel & Raad method, a series of numerical analysis using SEEP/W were carried out. It was found that the stability analysis of unsaturated soils calculated by using the soil-water characteristic curve of decomposed granite soils was found to be a proper analysis for shallow slope failures due to rainfall.

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Surficial Stability Evaluation of Homogeneous Slopes Considering Rainfall Characteristics (강우특성을 고려한 사면의 표면파괴에 대한 안정성 평가)

  • 조성은;이승래
    • Journal of the Korean Geotechnical Society
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    • v.16 no.5
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    • pp.107-116
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    • 2000
  • 강우에 의한 얕은 사면파괴는 우리 나라에서 흔히 볼수 있는 사면파괴의 형태이다. 본 연구에서는 재현기간에 따른 강우강도와 지속시간을 고려한 한계평형법에 의하여 이러한 얕은 사면파괴의 가능성을 평가하기 위함 방법에 대하여 논의하였다. 이를 위해 일차원 침투모델인 Green-Ampt 모델에 바탕을 둔 두 방법을 고려하였다. 즉 침투능에 따른 침투깊이를 산정하는 Pradel과 Raad의 방법과 일정한(uniform) 강우강도가 작용할 경우 폰딩(ponding)에 대해 해를 주는 Mein과 Larson의 방법을 고려하여 함수특성이 알려진 화강풍화토사면에 적용하였다. 연구결과에 의하며 Pradel과 Raad 방법은 실제 적용된 강우강도가 아닌 침투능을 바탕으로 침투깊이를 산정하므로 Mein과 Larson 방법에 비해 보수적인 사면안정 해석결과를 예측한다.

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