Estimating Poromechanical Properties Using a Nonlinear Poroelastic Model
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 139, Issue 8
Abstract
A physics-based method is proposed for simultaneously obtaining the hydraulic conductivity, Young’s modulus, and Poisson’s ratio of soil materials using the uniaxial consolidation test. A nonlinear poroelastic model is presented, and the settlement data from consolidation tests are fitted to the model at each load step with the least-squares error method to inverse the parameters. The model results perfectly fit the experimental data in the initial load steps but slightly deviate from the data in later load steps as a result of secondary settlement and a largely increased Young’s modulus. The inversed parameters are compared with those calculated from the uniaxial consolidation test and those found in the literature. The comparison results demonstrate that the inversed parameters are reasonable. The proposed method provides both an estimation of parameters and the parameter-change information during a consolidation test. The method is simple, efficient, and versatile for obtaining poromechanical parameters with the uniaxial consolidation test. These parameters are useful for groundwater, geomechanical, and mining engineering.
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Acknowledgments
This paper has greatly benefited from the comments of Editor-in-Chief Patrick J. Fox, an anonymous associate editor, and two reviewers. This work was supported by the National Science Council, Taiwan (NSC 97-2621-M-006-006) and the Water Resources Agency, Taiwan (MOEAWRA 0990363, MOEAWRA 1000076, and MOEAWRA 1010216).
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© 2013 American Society of Civil Engineers.
History
Received: Sep 5, 2011
Accepted: Nov 14, 2012
Published online: Nov 17, 2012
Published in print: Aug 1, 2013
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