Modelling Volume Change and Mechanical Properties With Hydraulic Models

Baumgartl, Thomas and Kock, Bernhard (2004) Modelling Volume Change and Mechanical Properties With Hydraulic Models. Soil Science Society of America Journal, 68 1: 57-65.

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Author Baumgartl, Thomas
Kock, Bernhard
Title Modelling Volume Change and Mechanical Properties With Hydraulic Models
Journal name Soil Science Society of America Journal   Check publisher's open access policy
ISSN 0361-5995
Publication date 2004-01-01
Sub-type Article (original research)
Open Access Status File (Author Post-print)
Volume 68
Issue 1
Start page 57
End page 65
Total pages 9
Language eng
Subject 300803 Natural Resource Management
300199 Soil and Water Sciences not elsewhere classified
260599 Hydrology not elsewhere classified
300101 Soil Physics
Abstract Volume change of soils may be caused either by external (mechanical) or internal (hydraulic) stresses or a combination of both. A complete description of volume change must therefore include both mechanical and hydraulic stresses. By coupling theories of mechanical and hydraulic stress states, a hydraulic function, which predicts the change of water volume as a function of the stress state parameter soil water suction (water retention curve), is adopted to model volume change. The utilisation of such a continuous function also enables the derivation of soil mechanical parameters (e.g. pre-consolidation stress, Youngs modulus) by determining mathematically the point of maximum curvature and inflection point. This information can then be used to calculate the pre-consolidation stress according to the method of Casagrande. The presented calculation has considerable advantages compared to the graphical method of Casagrande or other methods. On the basis of stress-strain relationships of various textured and structured soils and soil substrates and various test procedures (oedometer test, triaxial test; shrinkage test) volume change is modelled using the described method. It is shown, that modelling volume change by e.g. the van Genuchten equation using the software RETC is possible with high accuracy. Soil mechanical parameters are derived using the paramters of the van Genuchten equation.
Keyword void ratio
water retention curve
water potential
stress-strain relationship
van Genuchten
moisture ratio
Q-Index Code C1
Additional Notes Citation: Baumgartl, Thomas and Kock, Bernhard (2004) Modelling volume change and mechanical properties with hydraulic models. Soil Science Society of America Journal 68(1): 57-65.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Centre for Mined Land Rehabilitation Publications
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Created: Wed, 22 Nov 2006, 10:00:00 EST by Thomas Baumgartl on behalf of School of Engineering