| Title |
Analysis of an Actual Slope Failure in the Residual Soil by Suction Stress Based Effective Stress |
| Authors |
오세붕(Oh, Seboong) ; 노영(Lu, Ning) ; 박영목(Park, Young Mog) ; 이준석(Lee, Junsuk) |
| DOI |
https://doi.org/10.12652/Ksce.2012.32.3C.113 |
| Keywords |
불포화토;유효응력;흡수응력;침투;사면안정 unsaturated soils;effective stress;suction stress;infiltration;slope stability |
| Abstract |
An actual slope failure was analyzed in residual soils at Jinju. Due to rainfall infiltration, the safety factor decreases in the unsaturated layers, since the effective stress and shear strength decrease. In this study, the effective stress is based on suction stress using soil water retention curve. Unsaturated properties were evaluated on soil water retention curve, hydraulic conductivity and shear strength with samples from the site. After infiltration analysis of unsaturated flow under the actual rainfall, the distribution of pore water pressure could be calculated in the slope layers. In the stress field of finite elements, an elastic analysis calculated total stress distribution in the layers and also shear stresses on the slip surface using elastic model. On the slip surface, suction stress and effective stress evaluated the shear strength. As a result, the factor of safety was calculated due to rainfall, which could simulate the actual slope failure. In particular, it was found that the suction stress increases and both the effective stress and the shear strength decrease simultaneously on the slip surface. |