Effects of mica content on hydraulic anisotropy of unsaturated soil

2016 ◽  
pp. 1675-1683
Author(s):  
H Rahardjo ◽  
E Leong ◽  
K Chatterjea
Keyword(s):  
Unsaturated Soil ◽  
Hydraulic Anisotropy

scholarly journals Laboratory investigation on hydraulic anisotropy behavior of unsaturated soil

2017 ◽  
Vol 54 (7) ◽  
pp. 1034-1046 ◽  
Author(s):  
Priono ◽  
Harianto Rahardjo ◽  
Kalyani Chatterjea ◽  
Eng-Choon Leong
Keyword(s):  
Direct Measurement ◽  
Unsaturated Soil ◽  
Initial Conditions ◽  
Characteristic Curve ◽  
Transient Time ◽  
Indirect Determination ◽  
Direct Measurements ◽  
Hydraulic Anisotropy ◽  
Unsaturated Condition

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.

Vapor Transport in Unsaturated Soil.

1997 ◽  
Author(s):  
Leonard W. Lion ◽  
Brent Alspach ◽  
Jason Gilbert ◽  
Sean Lorden
Keyword(s):  
Unsaturated Soil ◽  
Vapor Transport

Soil Strength Reduction Method Induced by Variation of Water Content

2012 ◽  
Vol 170-173 ◽  
pp. 847-852
Author(s):  
Peng Ming Jiang ◽  
Zhong Lei Yan ◽  
Peng Li
Keyword(s):  
Slope Stability ◽  
Unsaturated Soil ◽  
Unsaturated Soils ◽  
Characteristic Curve ◽  
Strength Reduction ◽  
Actual State ◽  
Soil Slope ◽  
Simple Method ◽  
The Common ◽  
The Stability

As the complexity of unsaturated soil theory, and it must have a long test period when we study the unsaturated soils, so the conventional design analysis software does not provide such analysis, so we can imagine that such a slope stability analysis does not accurately reflect the actual state of the slope. Based on the known soil moisture content，this paper use the soil water characteristic curve and strength theory of unsaturated soil to calculate the strength reduction parameters of soil which can calculate the stability of the soil slope when using the common calculation method. It is noticeable that this method can be extended and applied if we establish regional databases for this simple method, and these databases can improve the accuracy of the calculation of slope stability.

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