The influence of the pore shape on the bulk modulus and the Biot coefficient of fluid-saturated porous rocks
Fluid-saturated rocks are multi-phasic materials and the mechanics of partitioning the externally applied stresses between the porous skeleton of the rock and the interstitial fluids has to take into consideration the mechanical behaviour of the phases. In these studies the porosity of the multi-pha...
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| Veröffentlicht in: | Scientific reports 2020-11, Vol.10 (1), p.18959-18959, Article 18959 |
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| description | Fluid-saturated rocks are multi-phasic materials and the mechanics of partitioning the externally applied stresses between the porous skeleton of the rock and the interstitial fluids has to take into consideration the mechanical behaviour of the phases. In these studies the porosity of the multi-phasic material is important for estimating the multi-phasic properties and most studies treat the porosity as a scalar measure without addressing the influence of pore shape and pore geometry. This paper shows that both the overall bulk modulus of a porous medium and the Biot coefficient depend on the shape of the pores. Pores with shapes resembling either thin oblate spheroids or spheres are considered. The Mori–Tanaka and the self-consistent methods are used to estimate the overall properties and the results are compared with experimental data. The pore density and the aspect ratio of the spheroidal pores influence the porosity of the geomaterials. For partially saturated rocks, the equivalent bulk modulus of the fluid–gas mixture occupying the pore space can also be obtained. The paper also examines the influence of the pore shape in estimating the Biot coefficient that controls the stress partitioning in fluid-saturated poroelastic materials. |
| doi_str_mv | 10.1038/s41598-020-75979-6 |
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The pore density and the aspect ratio of the spheroidal pores influence the porosity of the geomaterials. For partially saturated rocks, the equivalent bulk modulus of the fluid–gas mixture occupying the pore space can also be obtained. 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| subjects | 639/166 639/301 704/172 704/2151 704/2151/210 704/2151/213 704/2151/241 704/2151/2809 Estimates Humanities and Social Sciences Localization Mechanical properties multidisciplinary Permeability Pores Porosity Porous materials Porous media Rocks Science Science (multidisciplinary) Spheroids |
| title | The influence of the pore shape on the bulk modulus and the Biot coefficient of fluid-saturated porous rocks |
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