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흡수응력에 기반한 유효응력에 의한 실제 잔류토 사면 붕괴의 해석
오세붕(Oh Seboong),盧寧(Lu Ning),박영목(Park Young Mog),이준석(Lee Junsuk) 대한토목학회 2012 대한토목학회논문집 C Vol.32 No.3
진주 잔류토 사면의 실제 붕괴사례에 대한 해석을 수행하였다. 강우시 침투로 인하여 불포화층에서 유효응력과 전단 강도가 감소하여 안전율이 저하된다. 본 연구에서는 함수특성곡선을 이용하여 흡수응력에 기반한 유효응력을 산정하였다. 대상 현장에서 채취한 시료로부터 함수특성곡선, 투수계수, 전단강도와 관련한 불포화 물성들을 획득하였다. 실제 강우에 대한 불포화층의 침투해석을 수행하고 사면 지층의 간극수압 분포를 구할 수 있었다. 유한요소 응력장에서 탄성해석으로 지층내 전응력을 계산하고 활동면에 작용하는 전단응력의 분포를 계산하였다. 활동면에 작용하는 흡수응력 및 유효응력을 산정하여 전단강도를 평가할 수 있었다. 이로부터 강우에 따른 안전율을 계산하였으며, 실제 강우에 의하여 사면이 활동이 일어나는 것을 모의할 수 있었다. 또한 활동면에서 흡수응력이 증가하고 유효응력이 감소하는 동시에 전단강도가 감소하는 것을 추적할 수 있었다. 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.
이영휘,오세붕,박영목,우문정 圓光大學校 環境建設硏究所 2000 環境建設論文集 Vol.9 No.-
The shear strength characteristics of the residual soils and the sedimentary rocks such as the shale, the sandstone, the siltstone and the mudstone deposited in the Taegu-Kyongbuk area are evaluated from a series of direct shear test for undisturbed residual soils and triaxial compression test for intact rock specmens. The new sampler has been devised to obtain the undisturbed residual soil sample for the direct shear test. The triaxial compression tests for several types of the intact rock core(NX size) have been conducted and the material constants. 'm' and 's' to fit for the empirical failure criterion of Hoek-Brown(1980) were denyed from the regression analysis. A correlation between the uniaxial compressive strength of rock specimens and the other properties such as the Schmidt rebound value, the point load index, the P-wave velocity and the water absorption ratio and so on, are also made and the regression equations are proposed. In addition the measured strength parameters of the residual soil and the material constants of the rock considering the RMR(Bieniawski, 1974) for the jointed rock mass are applied to the actually failed slope. The results of analyses show that the observed failure surface in the field is coincided with the expected failure surface with the minimum factor of safety from the limit equilibrium analysis.