Laboratory determination of Soil-Water Characteristic Curves for cracked soil

2010 ◽  
pp. 409-415 ◽  
Author(s):  
M Abbaszadeh ◽  
S Houston ◽  
C Zapata ◽  
W Houston ◽  
B Welfert ◽  
...  
Keyword(s):  
Soil Water ◽  
Characteristic Curves ◽  
Laboratory Determination ◽  
Soil Water Characteristic Curves ◽  
Cracked Soil

Soil-water characteristic curves of clays

2014 ◽  
Vol 51 (8) ◽  
pp. 869-883 ◽  
Author(s):  
Snehasis Tripathy ◽  
Mohd Yuhyi M. Tadza ◽  
Hywel Rhys Thomas
Keyword(s):  
Polyethylene Glycol ◽  
Water Content ◽  
Soil Water ◽  
Matric Suction ◽  
Degree Of Saturation ◽  
Chemical Analyses ◽  
Test Results ◽  
Characteristic Curves ◽  
Soil Water Characteristic Curves

The drying suction – water content soil-water characteristic curves (SWCCs) of three clays (MX80 bentonite, yellow bentonite, and Speswhite kaolin) were experimentally determined using axis-translation, vapour equilibrium, and osmotic techniques. The shrinkage paths of the clays were established from Clod tests. The suction – water content SWCCs in conjunction with the Clod test results enabled establishing the suction – degree of saturation SWCCs and further determination of the air-entry values (AEVs) of the clays. Chemical analyses of the polyethylene glycol (PEG) solutions in the osmotic tests revealed an imbalance of the osmotic suctions between the expelled and the retained salts on either side of semi-permeable membranes. A decrease in the water content due to an applied suction for clays with significant osmotic efficiencies was explained by two mechanisms. In mechanism 1, the water content decrease prior to the air entry is controlled by the interparticle repulsive pressure, and in mechanism 2, a decrease in the degree of saturation following the air entry is primarily due to the matric suction. The agreements between the AEVs of the clays determined based on the osmotic suctions corresponding to various applied suctions and that determined from the suction – degree of saturation SWCCs were found to be very good.

Bimodal and multimodal descriptions of soil-water characteristic curves for structural soils

2013 ◽  
Vol 67 (8) ◽  
pp. 1740-1747 ◽  
Author(s):  
Shiyu Liu ◽  
Noriyuki Yasufuku ◽  
Qiang Liu ◽  
Kiyoshi Omine ◽  
Hazarika Hemanta
Keyword(s):  
Probability Density Function ◽  
Probability Density ◽  
Soil Water ◽  
Lognormal Distribution ◽  
Probability Density Functions ◽  
Density Functions ◽  
Characteristic Curves ◽  
Physically Based ◽  
Soil Water Characteristic Curves ◽  
Good Agreement

In the last decades several approaches have been developed to describe bimodal or multimodal soil-water characteristic curves (SWCCs). Unfortunately, most of these models were derived empirically. In the presented study, physically based bimodal and multimodal SWCC functions have been developed for structural soils. The model involved two or more continual pore series; the probability density functions for each pore series were assumed to be lognormal distribution and can be superposed to obtain the overall probability density function of the structural soils. The proposed functions were capable of simulating bimodal or multimodal SWCCs using parameters which can be related to physical properties of the structural soils. The experimental SWCC data were used to verify the proposed method. The fitting results showed that the proposed approaches resulted in good agreement between measurement and simulation. These functions can potentially be used as effective tools for indentifying hydraulic porosities in the structural mediums.

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