A Flexible Wall Permeameter for the Determination of the Water Permeability Function in Unsaturated Soils

2011 ◽  
Vol 34 (5) ◽  
pp. 103595
Author(s):  
L. D. Suits ◽  
T. C. Sheahan ◽  
M. P. H. Moncada ◽  
T. M. P. de Campos ◽  
G. Steger
Keyword(s):  
Water Permeability ◽  
Unsaturated Soils ◽  
Permeability Function ◽  
Flexible Wall

Use of instantaneous profile and statistical methods to determine permeability functions of unsaturated soils

2009 ◽  
Vol 46 (7) ◽  
pp. 869-874 ◽  
Author(s):  
Henry Krisdani ◽  
Harianto Rahardjo ◽  
Eng-Choon Leong
Keyword(s):  
Statistical Method ◽  
Unsaturated Soils ◽  
Pore Water Pressure ◽  
Direct Method ◽  
Water Pressure ◽  
Residual Soils ◽  
Profile Method ◽  
Permeability Function ◽  
Direct And Indirect Methods

This paper presents the determination of permeability functions by direct and indirect methods. The direct method used in this study was the instantaneous profile method, while the indirect method used was the statistical method. The instantaneous profile method was adopted to calculate permeability functions of residual soils used in laboratory slope models. Pore-water pressure measured using tensiometers along the slope models and independently measured soil-water characteristic curves (SWCCs) were used for the instantaneous profile calculation. To obtain a continuous permeability function, the instantaneous profile results were then fitted using the statistical method.

A flexible wall permeameter for measurements of water and air coefficients of permeability of residual soils

2003 ◽  
Vol 40 (3) ◽  
pp. 559-574 ◽  
Author(s):  
Agus Setianto Samingan ◽  
Eng-Choon Leong ◽  
Harianto Rahardjo
Keyword(s):  
Flow Rate ◽  
Unsaturated Soils ◽  
Temperature Fluctuations ◽  
Air Permeability ◽  
Matric Suction ◽  
Residual Soils ◽  
Volume Changes ◽  
Flexible Wall ◽  
Drying And Wetting Cycles ◽  
Suction Flow

This paper describes the development of a flexible wall permeameter apparatus for measuring the water and air coefficients of permeability of residual soils. Water and air coefficients of permeability were obtained for both the drying and wetting cycles for residual soils using the flexible wall permeameter. Volume changes of the soil specimens during unsaturated consolidation and during the water and air permeability measurements were also monitored. Factors that influence the measurements, such as hydraulic and pneumatic gradients and temperature fluctuations are described and discussed in this paper. The developed flexible wall permeameter was found to be capable of measuring water and air coefficients of permeability as low as 10–12 m/s.Key words: flexible wall permeameter, permeability, residual soils, unsaturated soils, matric suction, flow rate.

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