Identification of Poroelastic Constants of “Tight” Rocks from Laboratory Tests
Publication: International Journal of Geomechanics
Volume 6, Issue 3
Abstract
This paper discusses the identification of poroelastic constants and hydraulic conductivity from two transient laboratory tests performed on cylindrical core: drained isotropic confinement and pulse test. The combination of the two tests allows us to estimate all poroelastic parameters with the exception of the shear modulus. Despite the lack of analytical solutions for the fully coupled case, closed form solutions of the forward problems are obtained for a slender specimen. The validity of these solutions for a realistic aspect ratio of the core is assessed by a comparison with a finite element model. The identification problem is solved by minimizing a least square functional using an explicit gradient computed using the direct differentiation of the closed form solution and a Levenberg–Marquardt algorithm. The uniqueness of this inverse problem as well as the effect of noise on input data are fully discussed. The identification procedure is then applied to tests performed on a deep argillaceous rock (argillite of Meuse Haute–Marne).
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Acknowledgments
The authors would like to thank Professor E. Detournay and Dr. J. I. Adachi for the benefit of useful discussions. This research was funded by the French Agency for Radioactive Waste Management (ANDRA) through a Ph.D. Grant for B.L. The experimental campaign was run for ANDRA under Contract No. ANDRA UNSPECIFIED017079-Contract-cadre AQL. The experimental tests were performed at G3S, Ecole Poly Y technique, France by Serge Chanchole and François Coste.
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© 2006 ASCE.
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Received: Aug 24, 2004
Accepted: Jan 1, 2005
Published online: May 1, 2006
Published in print: May 2006
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