Effect of hydraulic anisotropy on soil–water characteristic curve

Priono,; Rahardjo, Harianto; Chatterjea, Kalyani; Leong, Eng Choon; Wang, Jing‐Yuan

doi:10.1016/j.sandf.2016.02.006

Cited by 14 publications

(16 citation statements)

References 16 publications

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“…For each type of specimen, VL orientation had a higher water coefficient of permeability compared to HL specimen. This observation is in agreement with study by Priono et al (2016Priono et al ( , 2017. In addition, hydraulic anisotropy value of specimen 1 is lower than those of specimens 2 and 3.…”

Section: Resultssupporting

confidence: 93%

“…Figures 7 to 9 also indicated that the hydraulic anisotropy values are relatively constant throughout application of matric suction and are similar to the value measured during the saturated condition for each specimen. These results are in agreement with the results from Priono et al (2016Priono et al ( , 2017 and Ursino et al (2000).…”

Section: Resultssupporting

confidence: 92%

“…For a given specimen, the SWCCs obtained from laboratory data are comparable regardless of HL or VL orientations. These results are in line with the study by Priono et al (2016) where SWCC is a scalar variable and it is not dependent on the direction of soil layering. Permeability functions of specimens 1, 2 and 3 are presented in Figures 7, 8 and 9, respectively.…”

Section: Resultssupporting

confidence: 92%

“…Hydraulic anisotropy represents the permeability ratio in parallel and perpendicular direction to soil layering as designated as kparallel/kperpendicular (Bear and Cheng, 2010), where high ratio value implies higher flow rate in parallel direction. Past study by Priono et al (2016) showed that both unsaturated and saturated coefficients of permeability parallel to the flow direction are greater than the respective values perpendicular to the flow direction. Priono et al (2017) also observed that the SWCC of unsaturated soils is almost identical regardless of its layering.…”

Section: Introductionmentioning

confidence: 90%

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

Rahardjo

Satyanaga

2019

JGS Special Publication

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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.

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Section: Resultssupporting

confidence: 93%

Section: Resultssupporting

confidence: 92%

Section: Resultssupporting

confidence: 92%

Section: Introductionmentioning

confidence: 90%

See 2 more Smart Citations

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

Rahardjo

Satyanaga

2019

JGS Special Publication

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“…With reference to hydraulic properties of soil, anisotropy is described as the ratio of water coefficients of permeability on major to minor axis of soil (Basak 1972;Mualem 1986;Bear and Cheng 2010;Priono et al 2016). The major axis indicates the direction which is parallel to the layering of soil whereas the minor axis indicates the perpendicular direction to the layering.…”

Section: Introductionmentioning

confidence: 99%

Laboratory investigation on hydraulic anisotropy behavior of unsaturated soil

et al. 2017

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Hydraulic anisotropy behavior of unsaturated soil has not been fully investigated. Direct laboratory measurement and indirect determination of hydraulic anisotropy under a drying condition were carried out on statically compacted specimens having different initial conditions. Direct measurement of permeability was carried out using an unsaturated triaxial permeameter whereas indirect determination of permeability was performed through statistical estimation via a measured drying soil–water characteristic curve (SWCC). In this research, two orientations — specifically horizontal-layering (HL) and vertical-layering (VL) orientations — were prepared for a given specimen from statically compacted homogeneous sand–kaolin. The results from both direct measurement and indirect determination of hydraulic anisotropy were in good agreement. Hydraulic anisotropy under an unsaturated condition was found to be similar with that in a saturated condition. Moreover, hydraulic anisotropy was reflected in the ratio of transient time during the direct measurements of HL and VL specimens at high matric suctions. In contrast, in the indirect method, hydraulic anisotropy was reflected in the ratio of equalization time during SWCC tests at matric suctions higher than the air-entry value of the soil.

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