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Article · Japanese Geotechnical Society Special Publication · April 30, 2019

Effect of grain-size distribution on hydraulic anisotropy of unsaturated soils

Harianto Budi Rahardjo, Alfrendo Satyanaga

Alfrendo Satyanaga Nio
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Abstract

As slope failures induced by rainfall are universal problems, especially in areas covered by residual soils, slope preventive system is necessary to avoid casualties. One effectively-proven alternative method is capillary barrier system (CBS) which utilizes the principles of unsaturated soil mechanics to minimize rainwater infiltration into soil layer. Previous studies indicated that the efficiency of CBS could be enhanced further by incorporating different hydraulic conductivities in two different directions. This study investigated hydraulic anisotropy by using two different types of soil layering, horizontal-layering (HL) and vertical-layering (VL), with two main soil compositions such as sandy silt and silty sand. The hydraulic anisotropy ratio observed in this study was then correlated with various soil properties, such as percentages of fines, dry density, plastic limit and liquid limit in order to find the relationship between hydraulic anisotropy ratio and soil properties. This study showed that percentages of fines and dry density of soils exhibit non-linear relationship with hydraulic anisotropy ratio, while plastic limit and liquid limit of soils exhibit linear relationship with hydraulic anisotropy ratio.

Soil and Unsaturated FlowGeotechnical Engineering and AnalysisGroundwater flow and contamination studieshydraulic anisotropyunsaturated soilgrain size distribution

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