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Discussion papers
https://doi.org/10.5194/se-2019-82
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-2019-82
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 27 May 2019

Research article | 27 May 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Solid Earth (SE).

A Multi-phasic Approach for Estimating the Biot Coefficient for Grimsel Granite

Patrick Selvadurai1, Paul Selvadurai2, and Morteza Nejati2 Patrick Selvadurai et al.
  • 1Department of Civil Engineering and Applied Mechanics, McGill University, Montréal, QC H3A 0C3, Canada
  • 2Department of Earth Sciences, ETH Zurich, Switzerland

Abstract. This paper presents an alternative approach for estimating the Biot coefficient for the Grimsel granite, which appeals to the multi-phasic mineralogical composition of the rock. The modelling considers the transversely isotropic nature of the rock that is evident from both the visual appearance of the rock and determined from mechanical testing. Conventionally, estimation of the compressibility of the solid material is performed by fluid saturation of the pore space and pressurization. The drawback of this approach in terms of complicated experimentation and influences of the unsaturated pore space is alleviated by adopting the methods for estimating the solid material compressibility using developments in theories for multiphasic elastic composite materials. The results of the proposed approach are used to develop a set of bounds for the Biot coefficient.

Patrick Selvadurai et al.
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Latest update: 19 Jul 2019
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Short summary
The paper presents an alternative technique for estimating the Biot coefficient, which governs the partitioning of stresses between a porous skeleton and the saturating pore fluid of a fluid-saturated rock.
The paper presents an alternative technique for estimating the Biot coefficient, which governs...
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