CAJ | 학술논문

在段河坝堆积层滑坡体不同地层开展了野外双环渗水试验,并利用野外高密度电法探测不同地层含水状态.结果表明：堆积层黄土渗透系数为1.90×10?4～2.25×10?3 cm/s,最大渗透深度约为1.55 m；风化千枚岩层渗透系数为2.87×10?5 cm/s,为相对隔水层.室内颗粒分析试验分析表明导致两者渗透差异的原因主要是不同粒组含量、密度等,通过高密度电法试验得到风化千枚岩层含水率很高.推测造成堆积层滑坡降雨致滑的主要原因并非是大气降水在堆积层缓慢下渗,而是沿坡积黄土层和风化千枚岩内部裂缝、落水洞等优势通道下渗,在风化千枚岩层滞留,使其含水量增加,抗剪强度降低,导致斜坡内部发生变形.
재단하패퇴적층활파체불동지층개전료야외쌍배삼수시험,병이용야외고밀도전법탐측불동지층함수상태.결과표명：퇴적층황토삼투계수위1.90×10?4～2.25×10?3 cm/s,최대삼투심도약위1.55 m；풍화천매암층삼투계수위2.87×10?5 cm/s,위상대격수층.실내과립분석시험분석표명도치량자삼투차이적원인주요시불동립조함량、밀도등,통과고밀도전법시험득도풍화천매암층함수솔흔고.추측조성퇴적층활파강우치활적주요원인병비시대기강수재퇴적층완만하삼,이시연파적황토층화풍화천매암내부렬봉、낙수동등우세통도하삼,재풍화천매암층체류,사기함수량증가,항전강도강저,도치사파내부발생변형.
An in-situ double-ring infiltration test and electrical resistivity tomography method were carried out in the different strata of the Duanheba landslide and the research indicated that the infiltration rate of the colluvial loess was 1.90×10?4–2.25×10?3 cm/s, and the most infiltration height was 1.55 m. The infiltration rate of the weathered phyllite, which was a relative confining bed, was 2.87×10?5 cm/s. An indoor granulocytic test indicated that the main causes of infiltration rate differences were the content and density of soil with different diameters. The electrical resistivity tomography method showed that the weathered phyllite had a high moisture content. The main cause of colluvial landslides sliding under rainfall was that the rainfall was infiltrated into a landslide along the preferential pathway such as a crack and sink in the colluvial soil and the weathered phyllite, then the perched water formed in the weathered phyllite;therefore the moisture content of the weathered phyllite increased, the shear strength reduced and the deformation occurred inside the slope.