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Modeling Volume Change and Mechanical Properties with Hydraulic Models

Th. Baumgartl*,a and B. Köckb

a Inst. for Plant Nutrition and Soil Sci., Univ. of Kiel, Olshausenstrasse 40, 24118 Kiel, Germany
b School of Mathematics, Univ. of Southampton, Southampton, SO17 1BJ, U.K



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  		Fig. 1. Stress–strain relationship as a consequence of compaction and shrinkage.

 


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  		Fig. 2. Void ratio e and moisture ratio {vartheta} as a function of the dependent variable mechanical stress {sigma} or hydraulic stress {Psi}.

 


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  		Fig. 3. Determination of the preconsolidation stress according to the method of Casagrande (1936).

 


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  		Fig. 4. Data and model of the stress–strain relationship (compression) of the investigated substrates.

 


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  		Fig. 5. Data, model, and Youngs modulus of the stress–strain relationship (shrinkage) of the substrates Kaolin K2 and Kaolin K3 and preshrinkage stresses.

 


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  		Fig. 6. Influence of the van Genuchten parameters {alpha} and n on the value of the preconsolidation stress (isobars in kPa; {alpha} in 1/kPa).

 




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